Dell PowerVault MD 32XX/36XX Series Storage Arrays CLI Guide

Re-Create Snapshot

Description

This command starts a new copy-on-write operation by using an existing snapshot virtual disk. You can re-create a single snapshot virtual disk or recreate multiple virtual disks.

CAUTION: Before you create a new point-in-time image of a source virtual disk, stop any data access (I/O) activity or suspend data transfer to the source virtual disk to ensure that you capture an accurate point-in-time image of the source virtual disk. Close all applications, including Windows Internet Explorer, to make sure all I/O activity has stopped.

NOTE: Removing the drive letter of the associated virtual disk in Windows or unmounting the virtual drive in Linux helps guarantee a stable copy of the drive for the Snapshot.

Syntax

recreate snapshot (virtualDisk [
                                 virtualDiskName] |
                                 virtualDisks [
                                 virtualDiskName1 ...
                                    virtualDiskNameN
                                 ])
                                 [userLabel=”
                                 snapshotVirtualDiskName”
                                 warningThresholdPercent=
                                 percentValue
                                 repositoryFullPolicy (failSourceWrites |
                                 failSnapshot)]

Parameters

Parameter	Description
`virtualDisk` or `virtualDisks`	Name of the specific virtual disk for which to start a fresh copy-on-write operation. You can enter more than one virtual disk name. You must put brackets ([ ]) around the virtual disk name. If the virtual disk name has special characters, you must also put quotation marks (" ") around the virtual disk name.
`userLabel`	Name of the snapshot virtual disk. You must put quotation marks (" ") around the snapshot virtual disk name. If you enter more than one snapshot virtual disk name, this command fails.
`warningThresholdPercent`	Percentage of repository capacity at which you receive a warning that the repository is nearing full. Use integer values. For example, a value of `70` means 70 percent. The default value is 50 percent. NOTE: If `warningThresholdPercent` is not specified, the previously set value is used.
`repositoryFullPolicy`	Specifies how snapshot processing continues if the repository is full. You can choose to fail writes to the source virtual disk ( `failSourceWrites`) or fail writes to the snapshot virtual disk ( `failSnapShot`). The default value is `failSnapShot`. NOTE: If `repositoryFullPolicy` is not specified, the previously set value is used.

Additional Information

NOTE: You can use any combination of alphanumeric characters, hyphens, and underscores for the names. Command names can have a maximum of 30 characters. If you exceed the maximum character limit, replace square brackets ([ ]) with angle brackets (< >) to overcome this limitation.

You can recreate a single snapshot virtual disk or multiple snapshot virtual disks with optional parameters:

If you specify one or more of the optional parameters, the re-create operation processes each snapshot virtual disk separately.
If you try to use the same user label for more than one virtual disk, the command fails.
If you do not set the warningThresholdPercent parameter or the repositoryFullPolicy parameter, values that you previously set are used.

You can recreate multiple snapshot legacy virtual disks without optional parameters:

If you list multiple snapshot legacy virtual disks to be re-created but do not specify any of the optional parameters, the re-create operation processes the snapshot virtual disks as a batch process.
Validation checks for the necessary snapshot-restarted preconditions are performed before restarting any snapshot. If any of the listed snapshot virtual disks fail the validation, the entire command fails and the snapshot virtual disks are not re-created. If the validation is successful for all of the snapshot virtual disks in the list, but one or more of the snapshots in the list fails to restart, the entire command fails and none of the snapshots are re-created.
During snapshot re-creation, all affected virtual disks (snapshots, base, and repository) are appropriately quiesced and I/O operations are resumed to all affected virtual disks after all snapshots have been successfully re-created.

NOTE: If the warningThresholdPercent parameter or the repositoryFullPolicy parameter is not specified, the previously set values are used. If you use the optional parameters, the re-create snapshot processes each snapshot virtual disk separately. If the same userLabel (name) is specified for more than one virtual disk, the command fails. If no optional parameters are specified, the re-create Snapshot processes the specified snapshot virtual disks as a batch, provided a validation check of all of the virtual disks runs successfully. If successful, the snapshots start the re-creation process and all of the affected virtual disks (snapshot, source, and repository) are quiesced until the process is complete.

NOTE: If no optional parameters are specified, the recreate snapshot command processes the specified snapshot legacy virtual disks as a batch, provided a validation check of all of the virtual disks runs successfully. If successful, the snapshots start the re-creation process and all of the affected virtual disks (snapshot, source, and repository) are quiesced until the process is complete.

NOTE: Dell is discontinuing support of the VSS and VDS hardware providers. See the Dell MD Series Storage Arrays Information Update for details on the deprecation. For supported software, refer to the Supported Management Software section of the Dell™ PowerVault™ MD Series Support Matrix at Dell.com/powervaultmanuals.

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