In addition, you can specify which policy to use when the capacity of the consistency group repository reaches its maximum defined
percentage:
–
Automatically purge oldest consistency image
— The system automatically purges the oldest consistency image in the
consistency group, which releases the repository’s reserve space for reuse within the consistency group.
•
Reject writes to base virtual disk
— When the repository reaches its maximum defined percentage, the system rejects any I/O write
request to the base virtual disk that triggered the repository access.
1
From the AMW, select the
Storage & Copy Services
tab.
2
From the consistency groups category node, select the consistency group that you want to change and then select
Copy Services
>
Consistency Group
>
Change Settings.
The
Change Consistency Group Settings
window is displayed.
3
Change the consistency group settings as required.
4
Click
OK
to apply your changes to the consistency group.
Adding a member virtual disk to a consistency group
Use the
Add Member Virtual Disks
option to add a new member virtual disk to an existing consistency group. When a new member is
added to a consistency group, you must also add a repository virtual disk.
Standard virtual disks and thin virtual disks are the only type of virtual disks that can be used for a consistency group. The base virtual disk
can reside on either a disk group or a disk pool.
If you decide to re-create the snapshot virtual disk or consistency group snapshot virtual disk, you must choose a snapshot image from the
same base virtual disk.
The following guidelines apply:
•
The Snapshot premium feature must be enabled on the storage array.
•
To add a new member virtual disk, the consistency group must have has less than the maximum number of allowable virtual disks (as
defined by your configuration).
•
If the base virtual disk resides on a standard disk group, the repository members for any associated consistency group can reside on
either a standard disk group or a disk pool. If a base virtual disk resides on a disk pool, the repository members for any associated
consistency group must reside on the same disk pool as the base virtual disk.
•
You cannot add a member virtual disk that is in a failed state.
1
From the Array Management Window (AMW), select the
Storage & Copy Services
tab.
2
Do one of the following:
•
Select the base virtual disk that you want to add to the consistency group and then select
Storage
>
Virtual disk
>
Add to
Consistency Group.
The
Select Consistency Group and Repository
window is displayed.
•
Select the consistency group to which you want to add member virtual disks and then select
Copy Services
>
Consistency Group
>
Add Member Virtual Disks.
The
Select Virtual Disks and Repositories
window is displayed.
3
Depending on your selection in step 2, do one of the following:
•
In the
Select Consistency Group and Repository
window, select the consistency group from the
Consistency groups
table, to
which you want add the base virtual disk.
•
In the
Select Virtual Disks and Repositories
, select the member virtual disks from the eligible virtual disks table, that you want to
add to the consistency group. The eligible virtual disks table shows only those virtual disks that are capable of being used in the
consistency group. You can click the
Select all
check box to add all the virtual disks displayed in the
Eligible virtual disks
table to
the consistency group.
4
Select how you want to create the repository for the member virtual disk(s) you are adding to the consistency group:
•
Select
Automatic
and click
Finish
to create the repository with the default capacity settings. This option is the recommended one.
•
Select
Manual
and click
Next
to define the capacity settings for the repository and then click
Finish
.
Use the Manual option if you want to specify all of the customizable settings for the repository. The Manual method is considered
advanced and only those who understand physical disk consistency and optimal physical disk configurations should use this method.
The new member virtual disk(s) for the consistency group are displayed in the
Member Virtual Disks
table.
Premium feature—Snapshot Virtual Disk
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