HP StorageWorks SAN Virtualization Services Platform administrator guide (5697-0204, January 2010)

noted that with the exception of striping, the SVSP does not change the performance of the back-end
array, and with the exception of synchronous mirrors, SVSP does not change the availability of a
back-end array. All physical LUs presented from any array should have the “preferred path” balanced
between controllers (for arrays with such a concept; this may not be applicable to HP XP arrays).
NOTE:
• Do not expand back-end LUs that are already configured in the SVSP. If a particular storage pool
runs out of free space and you want to expand it, create a new virtual disk on the EVA, and add
it to the pool.
• Do not change back-end LU numbers for LUNs that are already managed by the SVSP.
• Remove back-end LUs from SVSP management only after releasing them from storage pools and
stripe sets.
• Do not use HP Business Copy EVA or HP Continuous Access EVA (or the equivalent with other
arrays) on any back-end LU presented to the SVSP domain.
• Once a back-end LU is presented to the SVSP domain, do not change any characteristics of the
back-end LU.
• Do not rename a back-end LU once it has been included in a storage pool.
Adding EVAs
When using HP Command View EVA to create back-end LUNs on the EVA that will be presented to
the SAN Virtualization Services Platform domain (both DPM and VSM servers), or when presenting
existing EVA virtual disks to the domain (for data import) the following presentation rules apply:
• Each DPM quad and each VSM server must be defined as hosts and include all ports.
• Create a small number of large LUNs rather than many smaller LUNs.
• Display the virtual disk to the DPM quad and VSM server using the same LUN number. The EVA
virtual disk must be presented to both the DPM and VSM servers.
• The LUN must use the appropriate preferred controller setting of “failover/auto failback” option,
and not “no preference.”
Adding MSAs
The following process describes how to create back-end LUs on an MSA2000 and present them to
SVSP. For other MSAs, consult the MSA documentation.
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