Pro: Windows Server 2008, Server Administrator
Question No: 51 – (Topic 1)
Your company has a branch office that contains a Windows Server 2008 R2 server. The server runs Windows Server Update Services (WSUS).
The company opens four new satellite offices. Each satellite office connects to the branch office by using a dedicated WAN link.
You need to design a strategy for patch management that meets the following requirements:
->WSUS updates are approved from a central location.
->WAN traffic is minimized between the branch office and the satellite offices.
What should you include in your design?
In each satellite office, install a WSUS server. Configure each satellite office WSUS server as a replica of the branch office WSUS server.
In each satellite office, install a WSUS server. Configure each satellite office WSUS server as an autonomous server that synchronizes to the branch office WSUS server.
On the branch office WSUS server, create a computer group for each satellite office. Add the client computers in each satellite office to their respective computer groups.
For each satellite office, create an organizational unit (OU). Create and link a Group Policy object (GPO) to each OU. Configure different schedules to download updates from the branch office WSUS server to the client computers in each satellite office.
Answer: A Explanation:
Replica Mode and Autonomous Mode
You have two options when configuring the administration model for your organization’s downstream WSUS servers. The first option, shown in Figure 8-5, is to configure the downstream WSUS server as a replica of the upstream server. When you configure a WSUS server as a replica, all approvals, settings, computers, and groups from the upstream server are used on the downstream server. The downstream server cannot be used to approve updates when configured in replica mode, though you can change a replica server to the second mode-called autonomous mode-if an update urgently needs to be deployed.
Figure 8-5Downstream replica server
Question No: 52 – (Topic 1)
A company has client computers that run Windows 7. The company has Windows Server Update Services (WSUS) 3.0 with Service Pack 2 (SP2) deployed on a server that runs Windows Server 2008 R2.
You are designing an update management solution for the company#39;s client computers. The solution must meet the following requirements:
->Client computers must use WSUS for the installation of updates.
->Only administrators should receive update notifications from WSUS.
You need to design an update management solution that meets the requirements.
What should you recommend? (More than one answer choice may achieve the goal. Select the BEST answer.)
Define the WSUS settings in the Computer Configuration area of the Group Policy Management Console.
Define the WSUS settings in the User Configuration area of the Group Policy Management Console.
Define the WSUS settings in the User Configuration area of the Local Group Policy on client computers.
Define the WSUS settings in the Computer Configuration area of the Local Group Policy on client computers.
Answer: A Explanation:
FROM Step by Step guide to setting up WSUS 3.0 SP2 http://technet.microsoft.com/en- us/library/cc708519(v=ws.10) or http://blogs.microsoft.co.il/blogs/yanivf/archive/2007/09/23/install-wsus-3-0-stepby- step.aspx
To configure Automatic Updates
In Group Policy Object Editor, expand Computer Configuration, expand Administrative Templates, expand Windows Components, and then click Windows Update.
In the details pane, double-click Configure Automatic Updates. Click Enabled, and then click one of the following options:
Notify for download and notify for install: This option notifies a logged-on administrative user before the download and before the installation of the updates.
Auto download and notify for install: This option automatically begins downloading updates and then notifies a logged-on administrative user before installing the updates.
Auto download and schedule the install: If Automatic Updates is configured to perform a scheduled installation, you must also set the day and time for the recurring scheduled installation.
Allow local admin to choose setting: With this option, local administrators are allowed to use Automatic Updates in Control Panel to select a configuration option of their choice. For example, they can choose their own scheduled installation time. Local administrators are not allowed to disable Automatic Updates.
Set Up E-Mail Notifications
http://technet.microsoft.com/en-us/library/cc708608(v=ws.10).aspx In the WSUS Administration console, click Options in the left pane.
In the center pane, click E-Mail Notifications. Click the General tab.
If you want update notifications, select the Send e-mail notification when new updates are synchronized check box.
In the Recipients box, type the e-mail addresses of the people who should receive update notifications.
Separate the names with semi-colons.
If you want status reports, select the Send status reports check box. In the Frequency box, select either Daily or Weekly.
In the Send reports at box, set the time at which you want status reports to be sent.
In the Recipients box type the e-mail addresses of the people who should receive status reports, delimited by semicolons.
In the Language box, select the language in which the status reports should be sent. Click Apply to save these settings.
Question No: 53 – (Topic 1)
A company has client computers that run Windows 7. Each client computer is deployed with Microsoft Office 2010 pre-installed.
The company is adding three line-of-business-Applications that require access to Office functionality. None of the line-of-business Applications can co-exist with the others on the same client computer.
You are designing a solution that must meet the following requirements:
->Allow the use of all the line-of-business Applications on each client computer.
->Maintain a central inventory of all Applications.
->Centralize the process of deploying, streaming, updating and reporting on all Applications.
You need to recommend a solution that meets the requirements.
Which technologies should you recommend to achieve the indicated goals? To answer, select the appropriate technologies. Select all that apply.
Group Policy deployment
Microsoft Application Virtualization (App-V)
Microsoft Enterprise Desktop Virtualization (MED-V)
Microsoft System Center Configuration Manager 2007 R2
Microsoft System Center Operations Manager 2007 R2
Windows Server Update Services (WSUS)
Explanation: B: Microsoft Application Virtualization (App-V) also helps enterprises handle application compatibility issues, but it addresses challenges differently than MED-V does. Specifically, App-V lets you resolve conflicts that arise between different applications or different versions of the same application.
App-V integrates with System Center Configuration Manager, so you can manage virtual and physical applications, along with hardware and software inventory, operating system and patch deployment, and more.
Configuration Manager 2007 Software Update Management simplifies the complex task of delivering and managing updates to IT systems across the enterprise. IT administrators can quickly deliver updates of Microsoft products, third-party applications, custom in-house line-of-business applications, hardware drivers, and system BIOS to a variety of devices-including desktops, laptops, servers, and mobile devices.
Configuration Manager 2007 allows you to perform tasks such as: Deploying operating systems
Deploying software applications Deploying software updates Metering software usage
Assessing variation from desired configurations Taking hardware and software inventory Remotely administering computers
Not C: The key benefit of MED-V is that it helps enterprises deal with incompatibility
between applications and the operating system.
Not E: Operations Manager 2007 R2 helps reduce the cost of datacenter management with end-to-end monitoring and management of Microsoft, UNIX, and Linux servers and workloads, while assuring delivery of IT services to expected and agreed levels.
Not F: Windows Server Update Services (WSUS) enables information technology administrators to deploy the latest Microsoft product updates to computers that are running the Windows operating system.
Question No: 54 – (Topic 1)
Your network is configured as shown in the following diagram.
Each office contains a server that has the File Services server role installed. The servers have a shared folder named Resources.
You need to plan the data availability of the Resources folder. Your plan must meet the following requirements:
->If a WAN link fails, the files in the Resources folder must be available in all of the offices.
->If a single server fails, the files in the Resources folder must be available in each of
the branch offices, and the users must be able to use existing drive mappings.
->Your plan must minimize network traffic over the WAN links.
What should you include in your plan?
a standalone DFS namespace that uses DFS Replication in a full mesh topology
a domain-based DFS namespace that uses DFS Replication in a full mesh topology
a standalone DFS namespace that uses DFS Replication in a hub and spoke topology
a domain-based DFS namespace that uses DFS Replication in a hub and spoke topology
Answer: D Explanation:
MCITP Self-Paced Training Kit Exam 70-646 Windows Server Administration: Distributed File System (DFS) DFS is considerably enhanced in Windows Server 2008. It consists of two technologies, DFS Namespaces and DFS Replication, that you can use
(together or independently) to provide fault-tolerant and flexible file sharing and replication services.
DFS Namespaces lets you group shared folders on different servers (and in multiple sites) into one or more logically structured namespaces. Users view each namespace as a single shared folder with a series of subfolders. The underlying shared folders structure is hidden from users, and this structure provides fault tolerance and the ability to automatically connect users to local shared folders, when available, instead of routing them over wide area network (WAN) connections.
DFS Replication provides a multimaster replication engine that lets you synchronize folders on multiple servers across local or WAN connections. It uses the Remote Differential Compression (RDC) protocol to update only those files that have changed since the last replication. You can use DFS Replication in conjunction with DFS Namespaces or by itself.
Specifying the Replication Topology
The replication topology defines the logical connections that DFSR uses to replicate files among servers. When choosing or changing a topology, remember that that two one-way connections are created between the members you choose, thus allowing data to flow in both directions. To create or change a replication topology in the DFS Management console, right-click the replication group for which you want to define a new topology and then click New Topology. The New Topology Wizard lets you choose one of the following options:
Hub And Spoke This topology requires three or more members. For each spoke member, you should choose a required hub member and an optional second hub member for
redundancy. This optional hub ensures that a spoke member can still replicate if one of the hub members is unavailable. If you specify more than one hub member, the hub members will have a full-mesh topology between them.
Full Mesh In this topology, every member replicates with all the other members of the replication group. This topology works well when 10 or fewer members are in the replication group.
Question No: 55 – (Topic 1)
Your network consists of a single Active Directory forest. The sales department in your company has 600 Windows Server 2008 R2 servers.
You need to recommend a solution to monitor the performance of the 600 servers. Your solution must meet the following requirements:
->Generate alerts when the average processor usage is higher than 90 percent for
->Automatically adjust the processor monitoring threshold to allow for temporary changes in the workload.
What should you recommend?
Install Windows System Resource Manager (WSRM) on each server.
Deploy Microsoft System Center Operations Manager (OpsMgr).
Deploy Microsoft System Center Configuration Manager (SysMgr).
Configure Reliability and Performance Monitor on each server
Answer: B Explanation:
MCITP Self-Paced Training Kit Exam 70-646 Windows Server Administration: Microsoft System Center Operations Manager 2007
When planning the centralized monitoring and management of large numbers of Windows Server 2008 computers, you should consider implementing Microsoft System Center Operations Manager 2007. System
Center Operations Manager 2007 was touched on briefly during Chapter 4, “Application Servers and Services.”Microsoft System Center Operations Manager 2007 allows you to centrally manage and monitor thousands of servers and applications and provides a complete overview of the health of your network environment. System Center Operations
Manager 2007 is the most recent version of Microsoft Operations Manager 2005 (MOM). System Center Operations Manager 2007 provides the following features:
Proactive alerts that recognize conditions that are likely to lead to failure of critical services, applications, and servers in the future
The ability to configure tasks to automatically execute to resolve problems when given events occur
The collection of long-term trend data from all servers and applications across the organization with the ability to generate comparison reports against current performance Correlation of auditing data generated across the organization, allowing the detection of trends that might not be apparent when examining server auditing data in isolation
Question No: 56 HOTSPOT – (Topic 1)
A company has servers that run Windows Server 2008 R2. You are designing a storage solution for the servers.
The storage solution includes Fibre Channel (FC) and Internet SCSI (iSCSI) disk drive subsystems, and supports the Virtual Disk Service (VDS).
You need to ensure that you can create and manage logical unit numbers (LUNs) on the storage solution.
Which feature should you install?
To answer, select the appropriate feature in the answer area.
Storage Manager for SANs helps you create and manage logical unit numbers (LUNs) on Fibre Channel and iSCSI disk drive subsystems that support Virtual Disk Service (VDS) in your storage area network (SAN). A LUN is a logical reference to a portion of a storage subsystem. A LUN can comprise a disk, a section of a disk, a whole disk array, or a section
of a disk array in the subsystem. Using LUNs simplifies the management of storage resources in your SAN because they serve as logical identifiers through which you can assign access and control privileges.
Question No: 57 – (Topic 1)
Your network contains an Active Directory forest named contoso.com.
You plan to deploy a new child domain named branch.contoso.com. The child domain will contain two domain controllers. Both domain controllers will have the DNS Server server role installed. All users and computers in the branch office will be members of the branch.contoso.com domain.
You need to plan the DNS infrastructure for the child domain to meet the following requirements:
->Ensure resources in the root domain are accessible by fully qualified domain names.
->Ensure resources in the child domain are accessible by fully qualified domain
->Provide name resolution services in the event that a single server fails for a prolonged period of time.
->Automatically recognize when new DNS servers are added to or removed from the contoso.com domain.
What should you include in your plan?
On both domain controllers, add a conditional forwarder for contoso.com and create a standard primary zone for branch.contoso.com.
On both domain controllers, modify the root hints to include the domain controllers for contoso.com. On one domain controller, create an Active Directory-integrated zone for branch.contoso.com.
On one domain controller create an Active Directory-integrated zone for branch.contoso.com and create an Active Directory-integrated stub zone for contoso.com.
On one domain controller, create a standard primary zone for contoso.com. On the other domain controller, create a standard secondary zone for contoso.com.
Answer: C Explanation:
Understanding DNS Zone Replication in Active Directory Domain Services
Applies To: Windows Server 2008, Windows Server 2008 R2
You can store Domain Name System (DNS) zones in the domain or application directory partitions of Active Directory Domain Services (AD DS). A partition is a data structure in AD DS that distinguishes data for different replication purposes. For more information, see Understanding Active Directory Domain Services Integration.
The following table describes the available zone replication scopes for AD DS-integrated DNS zone data.
When you decide which replication scope to choose, consider that the broader the replication scope, the greater the network traffic caused by replication. For example, if you decide to have AD DS-integrated DNS zone data replicated to all DNS servers in the forest, this will produce greater network traffic than replicating the DNS zone data to all DNS servers in a single AD DS domain in that forest.
AD DS-integrated DNS zone data that is stored in an application directory partition is not replicated to the global catalog for the forest The domain controller that contains the global catalog can also host application directory partitions, but it will not replicate this data to its global catalog.
AD DS-integrated DNS zone data that is stored in a domain partition is replicated to all domain controllers in its AD DS domain, and a portion of this data is stored in the global catalog. This setting is used to support Windows 2000.
If an application directory partition#39;s replication scope replicates across AD DS sites, replication will occur with the same intersite replication schedule as is used for domain partition data.
By default, the Net Logon service registers domain controller locator (Locator) DNS
resource records for the application directory partitions that are hosted on a domain controller in the same manner as it registers domain controller locator (Locator) DNS resource records for the domain partition that is hosted on a domain controller.
When a zone that this DNS server hosts is a primary zone, the DNS server is the primary source for information about this zone, and it stores the master copy of zone data in a local file or in AD DS. When the zone is stored in a file, by default the primary zone file is named rone_name.dns and it is located in the %windir%\System32\Dns folder on the server.
When a zone that this DNS server hosts is a secondary zone, this DNS server is a secondary source for information about this zone. The zone at this server must be obtained from another remote DNS server computer that also hosts the zone. This DNS server must have network access to the remote DNS server that supplies this server with updated information about the zone. Because a secondary zone is merely a copy of a primary zone that is hosted on another server, it cannot be stored in AD DS.
When a zone that this DNS server hosts is a stub zone, this DNS server is a source only for information about the authoritative name servers for this zone. The zone at this server must be obtained from another DNS server that hosts the zone. This DNS server must have network access to the remote DNS server to copy the authoritative name server information about the zone.
You can use stub zones to:
Keep delegated zone information current. By updating a stub zone for one of its child zones regularly, the DNS server that hosts both the parent zone and the stub zone will maintain a current list of authoritative DNS servers for the child zone.
Improve name resolution. Stub zones enable a DNS server to perform recursion using the stub zone#39;s list of name servers, without having to query the Internet or an internal root server for the DNS namespace.
Simplify DNS administration. By using stub zones throughout your DNS infrastructure, you can distribute a list of the authoritative DNS servers for a zone without using secondary zones. However, stub zones do not serve the same purpose as secondary zones, and they are not an alternative for enhancing redundancy and load sharing.
There are two lists of DNS servers involved in the loading and maintenance of a stub zone:
The list of master servers from which the DNS server loads and updates a stub zone. A master server may be a primary or secondary DNS server for the zone. In both cases, it will have a complete list of the DNS servers for the zone.
The list of the authoritative DNS servers for a zone. This list is contained in the stub zone using name server (NS) resource records.
When a DNS server loads a stub zone, such as widgets.tailspintoys.com, it quenes the master servers, which can be in different locations, for the necessary resource records of the authoritative servers for the zone widgets.tailspintoys.com. The list of master servers may contain a single server or multiple servers, and it can be changed anytime.
Question No: 58 – (Topic 1)
Your network consists of a single Active Directory domain. All domain controllers run Windows Server 2008 R2.
Your company and an external partner plan to collaborate on a project. The external partner has an Active Directory domain that contains Windows Server 2008 R2 domain controllers.
You need to design a collaboration solution that meets the following requirements:
->Allows users to prevent sensitive documents from being forwarded to untrusted recipients or from being printed.
->Allows users in the external partner organization to access the protected content to
which they have been granted rights.
->Sends all interorganizational traffic over port 443.
->Minimizes the administrative effort required to manage the external users.
What should you include in your design?
Establish a federated trust between your company and the external partner. Deploy a Windows Server 2008 R2 server that has Microsoft SharePoint Foundation 2010 installed.
Establish a federated trust between your company and the external partner. Deploy a Windows Server 2008 R2 server that runs Microsoft SharePoint 2010 and that has the Active Directory Rights Management Services (AD RMS) role installed.
Establish an external forest trust between your company and the external partner. Deploy a Windows Server 2008 R2 server that has the Active Directory Certificate Services server role installed. Implement Encrypting File System (EFS).
Establish an external forest trust between your company and the external partner. Deploy a Windows Server 2008 R2 server that has the Active Directory Rights Management Service (AD RMS) role installed and Microsoft SharePoint Foundation 2010 installed.
Answer: B Explanation:
MCITP Self-Paced Training Kit Exam 70-646 Windows Server Administration:
Active Directory Federation Services
You can create forest trusts between two or more Windows Server 2008 forests (or Windows Server 2008 and Windows Server 2003 forests). This provides cross-forest access to resources that are located in disparate business units or organizations. However, forest trusts are sometimes not the best option, such as when access across organizations needs to be limited to a small subset of individuals. Active Directory Federation Services (AD FS) enables organizations to allow limited access to their infrastructure to trusted partners. AD
FS acts like a cross-forest trust that operates over the Internet and extends the trust relationship to Web applications (a federated trust). It provides Web single-sign-on (SSO) technologies that can authenticate a user over the life of a single online session. AD FS securely shares digital identity and entitlement rights (known asclaims) across security and enterprise boundaries.
Windows Server 2003 R2 introduced AD FS and Windows Server 2008 expands it. New AD FS features introduced in Windows Server 2008 include the following:
Improved application supportWindows Server 2008 integrates AD FS with Microsoft Office SharePoint Server 2007 and Active Directory Rights Management Services (AD RMS).
Improved installationAD FS is implemented in Windows Server 2008 as a server role. The installation wizard includes new server validation checks.
Improved trust policyImprovements to the trust policy import and export functionality help to minimize configuration issues that are commonly associated with establishing federated trusts.
AD FS extends SSO functionality to Internet-facing applications. Partners experience the same streamlined SSO user experience when they access the organization’s Web-based applications as they would when accessing resources through a forest trust. Federation servers can be deployed to facilitate businesstobusiness (B2B) federated transactions.
AD FS provides a federated identity management solution that interoperates with other security products by conforming to the Web Services Federation(WS-Federation) specification. This specification makes it possible for environments that do not use Windows to federate with Windows environments. It also provides an extensible architecture that supports the Security Assertion Markup Language (SAML) 1.1 token type and Kerberos authentication. AD FS can perform claim mapping-for example, modifying claims using business logic variables in an access request. Organizations can modify AD FS to coexist with their current security infrastructure and business policies.
Finally, AD FS supports distributed authentication and authorization over the Internet. You can integrate it into an organization’s existing access management solution to translate the claims that are used in the organization into claims that are agreed on as part of a
federation. AD FS can create, secure, and verify claims that move between organizations. It can also audit and monitor the communication activity between organizations and departments to help ensure secure transactions.
Question No: 59 – (Topic 1)
Your network consists of a single Active Directory domain. The domain controllers run Windows Server 2008 R2. Your company#39;s enterprise security policy states that the domain controllers cannot contain optical drives.
You need to recommend a backup and recovery plan that restores the domain controllers in the event of a catastrophic server failure.
What should you recommend?
Use Windows Server Backup to back up each domain controller to a local disk. Create a Windows Recovery Environment (Windows RE) partition on each domain controller.
Use Windows Server Backup to back up each domain controller to a local disk. Use Windows Deployment Services (WDS) to deploy the Windows Recovery Environment (Windows RE).
Use Windows Server Backup to back up each domain controller to a remote network share. Create a Windows Recovery Environment (Windows RE) partition on each domain controller.
Use Windows Server Backup to back up each domain controller to a remote network share. Use Windows Deployment Services (WDS) to deploy the Windows Recovery Environment (Windows RE).
Answer: D Explanation:
http://technet.microsoft.com/en-us/library/cc766048(WS.10).aspx http://technet.microsoft.com/en-us/library/cc765966(v=WS.10).aspx (Must Read)
You must be a member of the Administrators group or Backup Operators group to use Windows Server Backup.
In Windows Server 2008, the firewall has been enabled by default. If you are managing the backups of another computer using the Windows Server Backup snap-in, your connectivity to the remote computer may be affected and can be resolved by changes in the firewall
While working on the local computer, you are not affected.
Also, if you are a current user of the previous backup feature (Ntbackup.exe) that shipped in earlier versions of Windows, and plan to switch to the new Windows Server Backup, you might be affected by the following issues and changes:
Settings for creating backups will not be upgraded when you upgrade to Windows Server 2008. You will need to reconfigure settings.
You will need a separate, dedicated disk for running scheduled backups. Only NTFS-formatted volumes on a locally attached disk can be backed up.
You can no longer back up to tape. (However, support of tape storage drivers is still included in Windows Server 2008.) Windows Server Backup supports backing up to external and internal disks, DVDs, and shared folders.
You cannot recover backups that you created with Ntbackup.exe by using Windows Server Backup. However, a version of Ntbackup.exe is available as a download to Windows Server
2008 for users who want to recover data from backups created using Ntbackup.exe. The downloadable version of Ntbackup.exe is only for recovering backups for older versions of Windows and cannot be used to create new backups in Windows Server 2008.
Windows Server 2008 R2 including:
The ability to backup System State as a separate job as well as the ability to do incremental System State backups.
The ability to exclude specific file types, file folders, and specific files instead of having to backup an entire volume.
The ability to backup to a volume or a network share instead of requiring a dedicated disk for backups.
Windows Recovery Technical Reference
Windows Recovery Environment (Windows RE) is an extensible recovery platform based on Windows Preinstallation Environment (Windows PE). When the computer fails to start, Windows automatically fails over into this environment, and the Startup Repair tool in Windows RE automates the diagnosis and repair of an unbootable Windows Vista installation. Furthermore, Windows RE is a starting point for various tools for manual system recovery. The primary audience of this technology includes original equipment manufacturers
(OEMs), original device manufacturers (ODMs), and corporate IT professionals.
Image-based Recovery from Windows RE
In the event that the Windows installation cannot be repaired with Startup Repair or other manual repair steps, Windows RE can be used to launch an image-based recovery tool.
User-created Recovery Image
Windows Vista provides end users with the ability to create a backup image of their entire operating system.
End users can do this by using the Backup tool. The system image can be stored on an external hard disk, on a hard disk partition other than those imaged, or on a DVD. To restore the computer by using this system image, users must launch the restore interface from the list of Windows RE manual tools.
Factory-created Recovery Image
To facilitate restoring a computer to its factory state, a recovery image can be placed on the Windows RE partition. This eliminates the need for a separate recovery media in most cases.
If the Windows image format is used in the manufacturing process, the same operating system image can be used for recovery as well. A computer manufacturer can develop an application by using the Imaging APIs for Windows and the Windows image to restore the operating system volume. This application can be launched from the Windows RE user interface (UI) by using customizations provided by the ODM.
Question No: 60 HOTSPOT – (Topic 1)
A company has servers that run Windows Server 2008 R2.
You are designing a storage solution for the servers. The storage solution must meet the following requirements:
->Allow the use of Fibre Channel (FC), Internet SCSI (iSCSI), and Serial Attached SCSI (SAS) interfaces for connectivity to storage arrays.
->Support storage load balancing.
You need to ensure that the storage solution meets the requirements.
Which feature should you install?
To answer, select the appropriate feature in the answer area.
A growing number of organizations require that their data be available at all times. To meet this requirement, centralized storage must be readily available and immune to outages.
Multipathing is the ability of a system to use more than one read/write path to a storage device. It is a solution that provides fault tolerance against a single point-of-failure in hardware components.
The Microsoft庐 Multipath I/O (MPIO) framework helps ensure that your data is available at all times. MPIO supports multiple data paths to storage, improves the fault tolerance of the storage connection, and in some cases, provides greater aggregate throughput by using multiple paths at the same time. This helps improve system and application performance. Multipathing Support for High Availability
Windows Server庐 2008 includes many enhancements for the connectivity of a computer running a Windows server-class operating system to storage area networking (SAN) devices.
Among the enhancements enabling high availability for connecting Windows-based servers to SANs is integrated Multipath I/O (MPIO) support. Microsoft MPIO architecture supports iSCSI, Fibre Channel and serial attached storage (SAS) SAN connectivity by establishing multiple sessions or connections to the storage array. Multipathing solutions use redundant physical path components – adapters, cables, and switches – to create logical paths between the server and the storage device. In the event that one or more of these components
fails, causing the path to fail, multipathing logic uses an alternate path for I/O so that
applications can still access their data. Each network interface card (in the iSCSI case) or HBA should be connected by using redundant switch infrastructures to provide continued access to storage in the event of a failure in a storage fabric component.
Failover times vary by storage vendor, and can be configured by using timers in the Microsoft iSCSI Software
Initiator driver, or modifying the Fibre Channel host bus adapter driver parameter settings. New MPIO features in Windows Server 2008 include a Device Specific Module (DSM) designed to work with storage arrays that support the asymmetric logical unit access (ALUA) controller model (as defined in SPC-3), as well as storage arrays that follow the Active/Active controller model.
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