User manual

Chapter 6: Management with the CLI
193
1 Mirroring on two drives.
5 Parity, requiring 3 or more drives.
10 Mirroring on even number of drives.
1e Extended mirroring, requiring 2 or more drives.
50 Striping on multiple RAID 5, requiring 6 or more drives.
6 Allow two drive failure, requiring 4 or more drives.
60 Striping on multiple RAID 6, requiring 8 or more drives.
Capacity= Specifies logical drive capacity. Can be specified in
megabytes (mb), gigabytes (gb) or terabytes (tb), up to 2
decimal places. If not specified, all available capacity is
used for this logical drive.
Stripe= Specifies logical drive stripe size. Options include 64KB,
128 KB, 256 KB, 512 KB, and 1024 KB. If not specified,
the default 64KB is used.
Sector= Specifies logical drive sector size. Options include 512 B,
1 KB, 2 KB, and 4 KB. Sector size cannot exceed Stripe
size. Auto-adjusted not to exceed the maximum
supported sector size of the controller. See controller
information on page 200. If not specified, the default
512 B is used.
WritePolicy= Specifies logical drive write policy.
writethru Writes are not cached
writeback Writes are cached
ReadPolicy= Specifies logical drive read policy.
readahead Reads extra data to help reduce read times of sequential
data.
readcache Caches reads the data in case the same request is made
again.
nocache No caching algorithm.
Axle= A member element when creating a RAID10 or RAID50
or RAID60. RAID10 have 2 axles, RAID50 and RAID60
may have up to 16 axles with up to 16 drives per axle.
PreferredCtrlId= Subsystems only. Specifies which controller the LD is
preferred for LUN affinity. Valid value is 1 or 2. If value is
not specified, LUN affinity is auto balanced.
-c <array count> Specifies the number of arrays to give a summary of
when used with the -a list option. For example 'array -a
list -c3' will give a summary for the first 3 arrays on that
controller.