Dell PowerVault MD3260i - Manual (Page 180)

Parameter Description
repositoryVirtualDisk The name of the repository virtual disk that contains the
snapshot group. Enclose the snapshot repository virtual
disk name in double quotation marks (" ").
The repository virtual disk name is comprised of two parts:
• The term repos
• A four-digit numerical identifier that you assign to
the repository virtual disk name
repositoryFullPolicy Defines how snapshot image processing continues if the
snapshot image repository virtual disk is full. You can
choose to fail writes to the base virtual disk
(failBaseWrites) or delete (purge) the snapshot
images (purgeSnapImages). The default action is
purgeSnapImages.
rollBackPriority Determines whether system resources should be
allocated to the rollback operation at the expense of
system performance. A value of high indicates that the
rollback operation is prioritized over all other host I/O. A
value of low indicates that the rollback operation should
be performed with minimal impact to host I/O. The default
value is medium.
repositoryFullLimit The percentage of repository capacity at which you
receive a warning that the snapshot image repository
virtual disk is nearing full. Use integer values. For example,
a value of 70 means 70 percent. The default value is 75.
autoDeleteLimit The maximum number of snapshot images that you want
to automatically delete if you have selected to purge the
snapshot images for the repository full policy. The default
value is 32.
Notes
Each snapshot group user label must be unique. You can use any combination of alphanumeric characters, underscore
(_), hyphen(-), and pound (#) for the user label. User labels can have a maximum of 30 characters.
To create a snapshot group, you must have an associated repository virtual disk in which you store the snapshot
images. You can either use an existing repository virtual disk or create a new repository virtual disk. You can create the
repository virtual disk when you create the snapshot group. A snapshot group repository virtual disk is an expandable
virtual disk that is structured as a concatenated collection of up to 16 standard virtual disk entities. Initially, an
expandable repository virtual disk has only a single element. The capacity of the expandable repository virtual disk is
exactly that of the single element. You can increase the capacity of an expandable repository virtual disk by attaching
additional standard virtual disks to it. The composite expandable repository virtual disk capacity then becomes the sum
of the capacities of all of the concatenated standard virtual disks.
A snapshot group has a strict ordering of snapshot images based on the time that each snapshot image is created. A
snapshot image that is created after another snapshot image is a successor relative to that other snapshot image. A
snapshot image that is created before another snapshot image is a predecessor relative to that other one.
A snapshot group repository virtual disk must satisfy a minimum capacity requirement that is the sum of the following:
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