HP StorageWorks SAN Virtualization Services Platform Best Practices Guide (5697-0935, May 2011)

NOTE: The procedure refers to the two DPMs as DPM 1 and DPM 2, and it is assumed that the
Fibre Channel cables are disconnected from both DPMs.
1. Disable all licensed ports on all DPMs using the disable port [port number] command,
where port number indicates the DPM Fibre Channel port number to be disabled. Port numbers
range from 0–15.
2. Install new licenses on both VSM servers.
3. Failover all virtual disks from DPM 1 to DPM 2 (with both DPMs belonging to the same DPM
group).
4. Connect the Fibre Channel cables to DPM 1.
5. Enable licensed ports on DPM 1.
6. Configure the additional zones and set up the primary paths.
7. When all the DPM 1 ports are operational, fail over all virtual disks to DPM 1.
8. Connect the Fibre Channel cables to DPM 2.
9. Enable licensed ports on DPM 2.
10. Configure the additional zones and set up the primary paths.
11. When all the DPM 2 ports are operational, redistribute the virtual disks between the two DPMs.
Adding DPM groups
A DPM group is a set of DPMs that may be added to the configuration to increase performance
incrementally. The maximum number of DPM groups supported in SVSP version 3.x is four, and
the number of DPMs in a DPM group is two. All DPM groups in a SVSP domain must share the
same storage, therefore adding a DPM group does not increase the amount of managed capacity.
When the existing DPMs are saturated, additional groups may help when some paths to an array
are saturated.
You may add DPM groups if your environment contains:
• Storage mapping greater than 90 TB/DPM (30 TB/DPM with synchronous mirrors)
• More than 512 servers
• More than 4096 virtual disks presented
• More than 128 synchronous mirrors
To increase performance, you can move some of the virtual disks to the new DPM group. When
moving a virtual disk from one group to another, you must dismount and remount the virtual disk
on the servers using the virtual disk.
Adding SVSP domains
You can add SVSP domains to partition environments if it is not necessary for the servers to see
the same storage. One example is to have a production domain and a test domain.
Domain-to-domain features such as asynchronous mirroring and remote copy can be used to share
data between domains. However, synchronous mirroring is only supported within the same domain,
so it may be necessary to migrate some of the virtual disks to the new domain in order to balance
the synchronous mirror load.
Adding DPM groups 9