Eva4400 Operation; Best Practices; Operating Tips And Information; Reserving Adequate Free Space - HP StorageWorks 4400 User Manual

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
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

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
Setting
No preference
Best
Point in time
At initial presentation
On dual boot or controller resynch
On controller failover
HP StorageWorks 4400 Enterprise Virtual Array user guide
practices.
Behavior
The units are alternately brought online to
Controller 1 or to Controller 2.
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.
All LUNs are brought online to the surviv-
ing controller.
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