In the Connect To Target dialog box, click to select the Enable multi-path check box. Volumes that are created on the StorSimple appliance and that are visible to this server appear under Disk Management as new disks. Initialize the disk and create a new volume.
During the format process, select a block size of 64 kilobytes KB. Under Disk Management , right-click the disk, and then click Properties. Note Do not change the default parameters. Default parameters:.
When multiple subnets are not an option, you can still configure multiple interfaces on the same subnet for high-availability only purposes. For multipath-based HA and for load balancing, multiple sessions must be manually added to declare the different paths that are available.
For example, if the host has two interfaces that are connected to the storage area network SAN , and if the appliance has two interfaces that are connected to the SAN, four sessions are needed and have to be configured by using correct path permutations. To add sessions when an appliance that has two network adapters is connected to a host that has two network adapters, follow these steps:.
Perform a discovery of the target. This displays the Connect to Target dialog box. Leave the default selected target setting for Add this connection to the list of favorite targets.
In this case, timer values such as the PDORemovePeriod are set to a low value and then tested to ensure compliance with customer requirements. Scenario 2 A single server that is not configured as a failover cluster is configured with MPIO and multiple connections to storage to provide both increased throughput and fault tolerance of path failures. In this case, timers such as PDORemovePeriod are increased to allow additional time for path recovery to occur.
For any customer scenario, determining the best timer values to use depends on a number of different variables, such as any of the following, which could all potentially impact whether the current settings would meet SLA or Operating Level Agreement OLA requirements:.
Settings 1 through 5 in the following table can be set through the user interface. The information provided on these settings is specific to the use of Microsoft DSMs.
When using a vendor-provided DSM, refer to vendor documentation for information about the recommended timer values. Although it is possible to set the following values to a very large number, we recommend that you use caution when doing so, and that you test the values for applicability prior to using them in a production environment.
If this value were applied to a setting such as PDORemovePeriod where it represents seconds , the value would equate to approximately 49, days of delay before an error would be reported. Type is Boolean and must be filled with either 0 disable or 1 enable. By default, it is disabled.
This setting is used to indicate the time period in seconds with which MPIO has been requested to perform path verification.
This setting controls the amount of time in seconds that the multipath pseudo-LUN will continue to remain in system memory, even after losing all paths to the device. The default setting is 3. Represents the period after which PathRecovery is attempted.
The end result is that the system now has at least one path and one device online, but no pseudo-LUN to represent that device. MPIO has a path recovery mechanism that can be used to avoid this issue.
However, by default, the period at which path recovery is attempted is set to twice in the PDORemovePeriod. In the majority of cases, the default is acceptable, but it does not solve the problem in this particular scenario. This is where the settings listed in the previous tables come into play. They allow you to configure the timer that determines the period at which path recovery attempts are done.
This interval causes path recovery to be attempted every 30 seconds. Caution is advised when setting the PathRecoveryInterval to small values. By decreasing this value, larger amounts of path verification traffic are generated. This traffic increases with the number of LUNs available on the host, and the smaller the value. The following command, mpclaim.
To change the load-balancing policy setting to Least Blocks for all disks that are claimed by Microsoft DSM, use the following command: mpclaim. To clear the load-balancing policy settings for all disks claimed by Microsoft DSM and reset to the default, use the following command:. Note that the vendor string length is 8 characters, the product string length is 16 characters, and both fields are padded with spaces as needed.
Add MPIO support for all devices that are enterprise storage devices. The tool analyzes all devices that are seen by the system, determines if there are multiple paths to the device, and if there are, adds MPIO support for them. Note that the vendor string length is 8 characters, and the product string length is 16 characters.
The tool removes MPIO support for all devices on the system, even if multiple paths do not exist to the array. This command also displays the associated Vendor ID and Product ID required to add or remove support for the given device.
To use mpclaim , you must be running cmd. For a list of all hardware IDs for all currently attached devices, open a command prompt, and then type mpclaim —E. EXE —H. This ID is not used to control the management of any disk devices.
If a disk is presented on a given logical path, all disks presented on that path need to also be presented on all logical paths that contain any subset of those disks. Physical paths correspond to the actual physical hardware over which the logical paths are hosted. There may be more logical paths than physical paths, for example, with multiple logins in iSCSI scenarios, or in switched fibre channel infrastructure scenarios.
Invalid configurations may result in performance issues and spurious disk or path failures during failover scenarios. If disks A and B are both presented on paths 1, 2, and 3, and disk C is presented to only path 4, this is a valid configuration as it meets the above requirement of symmetrical presentation. By contrast, if disk A and B are both presented on path 1, disk B is presented on path 2, disk A is presented on path 3, and disk C is presented on path 4, this is an invalid configuration because paths 2 and 3 are not symmetric with path 1.
Software trace logs are binary files that are typically only used by Microsoft Technical Support for troubleshooting an issue, and are not directly viewable. The file must contain the GUID of the provider that corresponds to the driver that you want to trace. The Trace Flag and Trace Level values are typically specified by Microsoft Technical Support, depending on the type of troubleshooting being performed.
Log, type the following command:. The log file is a binary file. The first two discussed in the Configuring Multipath-IO section are:. The next sections walkthrough each of these management tasks using the graphical user interface GUI or Windows PowerShell.
See the Installing Multipath-IO section for more details. These steps work for Windows Server , R2, , and The only differences between the graphical user interface is the changes in the dialogs visual appearances. The example provided in this section are taken from Windows Server No 3rd party DSMs are supported. A Reboot Required dialog box will be displayed after completing this configuration.
Choose Yes or No depending on what other management or application tasks you are performing, but keep in mind that a reboot is required for the new MPIO Devices settings to take effect.
If iSCSI connectivity is being used, you may ignore this reboot requirement. The reason for this is to reduce the number of reboot cycles for the Windows Server host since adding iSCSI support requires an additional reboot. The following command will scan all devices detected by a system, find those that have multiple paths, and enable MPIO support for them: mpclaim.
Related posts: How to install Yarn on Windows? Common reasons for data loss in Azure Cache for Redis. Submit a Comment Cancel reply Your email address will not be published.
Search for:. Spend time on your business, not on your servers. Related Posts How to install Yarn on Windows? Latest Server Management. Bobcares uses cookies.
Privacy Preferences I Agree. Privacy Policy Required. By using this site, you agree to our Privacy Policy.
0コメント