Dell POWERVAULT MD3600I - Manual (Page 143)

4. In the Consistency group snapshot virtual disk name field, enter a unique name (30 character maximum) that best
describes the consistency group selected for this snapshot image. For example, AccountingData.
By default, the consistency group snapshot virtual disk name is shown in the name text box as:
[consistency-group-name] - SV + sequence-number
where SV (snapshot virtual disk) is the appended suffix and sequence-number is the chronological number of the
snapshot virtual disk relative to the consistency group.
For example, if you create the first snapshot virtual disk for a consistency group called “Accounting”, then the
default name of the snapshot virtual disk is “Accounting_SV_01”. The default name of the next snapshot virtual disk
you create based on “Accounting” is “Accounting_SV_02”.
There is a 30-character limit. After you reach this limit, you can no longer type in the text box. If the consistency
group name is 30 characters, then the default name for the group uses the base virtual disk name truncated enough
to add the suffix “SV” and the sequence string.
5. In the Map to host drop-down, specify how you want to map the host for each snapshot virtual disk created for a
selected member virtual disk.
This map attribute is applied to every member virtual disk you select in the consistency group. For more information
on the map attributes, see the online help topics.
The following guidelines apply:
– Each host has its own logical unit number (LUN) address space and will let the same LUN be used by
different host groups or hosts to access snapshot virtual disks in a storage array.
– You can define one mapping for each snapshot virtual disk in the storage array.
– Mappings are shared between RAID controller modules in the storage array.
– The same LUN cannot be used twice by a host group or a host to access a snapshot virtual disk. You must
use a unique LUN.
– An access virtual disk mapping is not required for out-of-band storage arrays.
6. Select how to grant host access to each selected member virtual disk’s snapshot virtual disk. Do one of the
following:
– Select Read/Write to provide the host application with WRITE access to a copy of the data contained in the
snapshot image. A Read-Write snapshot virtual disk requires an associated repository.
– Select Read Only to provide a host application with READ access to a copy of the data contained in the
snapshot image, but without the ability to modify the snapshot image. A Read-Only snapshot virtual disk
does not have an associated repository.
7. Select each member virtual disk in the consistency group for which you want to create a snapshot virtual disk.
You can click Select all to create a snapshot virtual disk for each member virtual disk displayed in the select
members table.
8. If you selected Read-Only host access in step 6, you can skip this step and go to step 9.
NOTE: Repositories are not required for Read-Only snapshot virtual disks.
9. Select how you want to create the snapshot virtual disk repositories for each member in the consistency group. Do
one of the following:
– Select Automatic and click Finish to create each snapshot virtual disk repository with the default capacity
settings. This option is the recommended one.
– Select Manual and click Next to define the properties for each snapshot virtual disk repository; then click
Finish to continue with the snapshot virtual disk creation process. You can click Edit individual repository
candidates to manually edit a repository candidate for each member virtual disk.
Use this option if you want to specify all of the customizable settings for the snapshot virtual disk repository. The
Manual method is considered advanced and only those who understand physical disk consistency and optimal
physical disk configurations should use this method.
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