Manually creating a consistency
group Snapshot Virtual Disk repository
During the creation of a consistency group
snapshot virtual disk that is designated as read-write, the system
requires a snapshot virtual disk repository for each member of the
consistency group to provide the host application with WRITE access
to a copy of the data contained in the snapshot image. You can create
the repository automatically using the default settings or you can
manually create the repository by defining the capacity settings for
the repository.
You are initially
creating an overall repository with one individual repository virtual
disk. However, the overall repository can contain multiple repository
virtual disks in the future for expansion purposes.
Use the Consistency Group Snapshot Virtual Disk Repository
Settings - Manual option to manually define the capacity
requirements for a consistency group snapshot virtual disk repository.
The Manual method is considered advanced and only those who understand
physical disk consistency, provisioning, and optimal physical disk
configurations should use this method.
The following
guidelines apply:
There is a minimum required capacity for a snapshot
virtual disk repository (depending on your configuration).
When you define the capacity requirements for a repository,
keep in mind any future requirements that you may have for other virtual
disks in this disk group or disk pool. Make sure that you have enough
capacity to meet your data storage needs, but you do not over allocate
because you can quickly use up all the storage in your storage array.
The list of repository candidates can contain both
new and existing repository virtual disks. Existing repository virtual
disks are left on the storage array by default when you delete a consistency
group snapshot virtual disk. Existing repository virtual disks are
placed at the top of the list. The benefit to reusing an existing
repository virtual disk is that you can avoid the initialization process
that occurs when you create a new one.
To create
a consistency group snapshot virtual disk repository:
From the AMW, select the Storage
& Copy Services tab.
Select the consistency group to which you
want to add member virtual disks and then select Copy Services > Consistency Group > Remove Member Virtual Disks.
The Consistency Group Snapshot
Virtual Disk Settings window is displayed.
Select Manual and click Next to customize the repository candidate settings for
the consistency group.
The Consistency Group Snapshot
Virtual Disk Repository Settings - Manual window is displayed.
Select how you want filter the repository candidates
for each member virtual disk in the consistency group, based on either
a percentage of the base virtual disk capacity or by preferred capacity.
The best repository candidate for each member
virtual disk based on your selections is displayed.
Select Edit individual repository
candidates if you want to edit repository candidates for
the member virtual disks.
Select the repository, from the Repository candidates table, that you want to use for
each member virtual disk in the consistency group.
Select a repository candidate that is closest to
the capacity you specified.
The Repository candidates table
shows both new and existing repositories that are capable of being
used for each member virtual disk in the consistency group based on
the value you specified for percentage or the value you specified
for preferred capacity.
By default, the system displays the repositories for
each member virtual disk of the consistency group using a value of
20 percent of the member virtual disk’s capacity. It filters out undersized
repository candidates, and those with different Data Service (DS)
attributes. If appropriate candidates are not returned using these
settings, you can click Run Auto-Choose to
provide automatic candidate recommendations.
The Difference column shows
the mathematical difference between your selected capacity and the
actual capacity of the repository candidate. If the repository candidate
is new, the system uses the exact capacity size that you specified
and displays zero (0) in the Difference column.
To edit an individual repository candidate:
Select the candidate from the Repository candidates table and click Edit to modify the capacity settings for the repository.
Click OK.
In the % full box,
define the value that determines when a warning is triggered when
the capacity of a consistency group snapshot virtual disk repository
reaches the defined percentage.
Click Finish to create
the repository.
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