HP 4000.6000.8000 Enterprise Virtual Arrays - Manual (Page 33)

3 Enterprise Virtual Array
operation
This chapter presents the tasks that you might need to perform during normal operation of the storage
system.
Best practices
For useful information on managing and configuring your storage system, refer to the HP
StorageWorks Enterprise Virtual Array configuration best practices white paper available from
http://h71028.www7.hp.com/ERC/downloads/5982-9140EN.pdf .
Operating tips and information
Reserving adequate free space
To ensure efficient storage system operation, a certain amount of unallocated capacity, or free space,
should be reserved 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, refer to the HP StorageWorks
Enterprise Virtual Array configuration best practices white paper. See Best practices .
Failback preference setting for HSV controllers
Table 3 describes the failback preference mode for each of the operating systems supported with HSV
controllers and Command View EVA.
Table 4 describes the failback default behavior and settings allowed for each operating system. The table
indicates when Secure Path is used in conjunction with the operating system
Table 3 Failback preference settings
Setting Point in time Behavior
At initial presentation The units are alternately brought online
to Controller A or to Controller B.
On dual boot or controller resynch If cache data for a LUN exists on a
particular controller, the unit will be
brought online there. Otherwise, the
units are alternately brought online to
Controller A or to Controller B.
On controller failover All LUNs are brought online to the
surviving controller.
No preference
On controller failback All LUNs remain on the surviving
controller. There is no failback except
if a host moves the LUN using SCSI
commands.
4000/6000/8000 Enterprise Virtual Array user guide 33