Dell POWERVAULT MD3600I User Manual
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See the online help topics for more information on how to set the repository parameters.
The snapshot virtual disk and its properties for the associated consistency group are displayed in the navigation
tree.
Creating A Consistency Group Snapshot Virtual Disk Repository (Manually)
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 redundancy, 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:
1.
From the AMW, select the Storage & Copy Services tab.
2.
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.
3.
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.
4.
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.
5.
Select Edit individual repository candidates if you want to edit repository candidates for the member virtual disks.
6.
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.
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