HP Surestore Disk Array 12h and FC60 - Manual (Page 295)

Managing the Disk Array Using Array Manager 60 295
M
a
na
ging
the
Di
sk
Array
on HP-UX
To replace a LUN, type:
amcfg -R : -d ,.....
-r
• The parameters and options available when replacing a LUN are the same as those used
when binding a LUN. See
"Binding a LUN" on page 289 .
Command Examples
The following example replaces existing LUN 0 on disk array 0000005EBD20. The new LUN
is RAID 5, uses a stripe segment size of 16
K
bytes, and is owned by controller A. Note that
each disk is in a different enclosure for high availability, and that there are no spaces
between the individual disk parameters.
amcfg -R A:0 -d 1:1,2:2,3:1,4:4,5:3 -r 5 -s 16 0000005EBD20
Managing Global Hot Spares
Global hot spares provide an additional level of protection for the data on your disk array.
A global hot spare automatically replaces a failed disk, restoring data redundancy and
performance that may suffer while in degraded mode. For maximum protection against
disk failure it is recommended that you add one global hot spare per channel.
For more information on using global hot spares, see "Global Hot Spares" on page 248 .
C AUTION
If you have disks of different capacities in your disk array, always select
disks of the largest capacity for your global hot spares. This ensures that any
disk failure is protected. See
"Global Hot Spare Disks" on page 61 for more
information on selecting disks for global hot spares.
If a larger disk is used to replace a smaller disk that has failed, the difference
in capacity will be unused. For example, if an 18-Gbyte disk is used as a
global hot spare for a 9-Gbyte disk, the remaining 9 GB of the global hot spare
remain unused.