HP StorageWorks Enterprise Virtual Array Cluster FIO Starter Kit Guida Utente Scaricare il pdf (Pagina 151)

B Adding arrays to the EVA Cluster

Adding a new array

The following guidelines must be observed when adding arrays to the domain:

• An array must be attached to both fabrics.

• Back-end zones are created as described in Chapter 3 on page 33. Two sets are needed and

are defined as follows:

• Array to DPMs

• Array to VSM servers

• If adding the array also involves using a new DPM quad, add the new DPM quad to the VSM

server zones and verify that the DPM ports are licensed.

• Using the management interface of the new array, create or define DPMs and VSMs as hosts, and

then present the back-end LUs to the DPMs and VSMs. Each pair of quads should have a unique

host definition.

• Refresh the VSM software using the VSM refresh button. Once the new back-end LU is visible, use

it and others to create stripe sets, then create pools. Use the pools to create front-end virtual disks.

It is also important to understand the best practices for the vendor-specific storage arrays that are

configured behind the SVSP. Since much of I/O directed at the SVSP will pass directly through the

SVSP, optimizing the arrays based upon the I/O characteristics has the most value. It should also be

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” set and

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.

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HP StorageWorks Enterprise Virtual Array Cluster FIO Starter Kit Guida Utente Pagina 151