Brocade Communications Systems StorageWorks 4400 Enterprise V User's Guide download pdf (Page 37)

2 EVA4400 operation

Best practices

For useful information on managing and configuring your storage system, see the HP StorageWorks

Enterprise Virtual Array configuration best practices white paper available from http://

h18006.www1.hp.com/storage/arraywhitepapers.html.

Operating tips and information

Reserving adequate free space

To ensure efficient storage system operation, reserve some unallocated capacity, or free space, in

each disk group. The recommended amount of free space is influenced by your system configuration.

For guidance on how much free space to reserve, see the HP StorageWorks Enterprise Virtual Array

configuration best practices white paper. See Best practices.

Using FATA disk drives

FATA drives are designed for lower duty cycle applications such as near online data replication for

backup. Do not use these drives as a replacement for EVA's high performance, standard duty cycle,

Fibre Channel drives. This practice could shorten the life of the drive. Download the following document

for more information on FATA drives, their uses and benefits:

http://h71028.www7.hp.com/ERC/downloads/5982-7353EN.pdf

Failback preference setting for HSV controllers

Table 10 describes the failback preference mode for the controllers.

Table 10 Failback preference settings

BehaviorPoint in timeSetting

The units are alternately brought online to

Controller 1 or to Controller 2.

At initial presentation

No preference

If cache data for a LUN exists on a partic-

ular controller, the unit will be brought

online there. Otherwise, the units are al-

ternately brought online to Controller 1 or

to Controller 2.

On dual boot or controller resynch

All LUNs are brought online to the surviv-

ing controller.

On controller failover

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Brocade Communications Systems StorageWorks 4400 Enterprise V User's Guide Page 37