Quick Reference Guide

Mandatory Options
and Arguments
Optional Parameters Valid Parameters
Arguments
Description
For SAS controllers, the value of enclosure
can be non-zero, in which case you must
specify values for channel, target, and
enclosure.
-r or -raid
0, 1, 5, 6, 10, 50, 60
Sets the RAID type or level for the virtual disk.
NOTE: If this option is not specified for
any RAID controller, RAID 0 is taken as
the default.
The valid arguments are:
• 0 — RAID 0 uses data striping, which
is writing data in equal-sized
segments across the array disks.
RAID 0 does not provide data
redundancy.
• 1 — RAID 1 is the simplest form of
maintaining redundant data. In RAID
1, data is mirrored or duplicated on
one or more drives.
• 5 — RAID 5 provides data redundancy
by using data striping in combination
with parity information. Rather than
dedicating a drive to parity, the parity
information is striped across all disks
in the array.
• 6 — RAID 6 is an extension of RAID 5
and uses an additional parity block. It
uses block-level striping with two
parity blocks distributed across all
member disks. RAID 6 provides
protection against double disk failures
and failures while a single disk is
rebuilding. In case there is only one
array, RAID 6 may be a better option
than a hotspare disk.
• 10 — RAID 10 is a stripe of mirrors.
Multiple RAID 1 mirrors are created,
and a RAID 0 stripe is created over
these.
• 50 — RAID 50 is a dual-level array
that uses multiple RAID 5 sets in a
single array. A single hard drive
failure can occur in each of the RAID
5 without any loss of data on the
entire array. Although the RAID 50 has
increased write performance, when a
hard drive fails and reconstruction
takes place, performance decreases,
data/program access is slower, and
transfer speeds on the array are
affected.
• 60 — RAID 60 is a combination of
RAID 6 and RAID 0. A RAID 0 array is
striped across RAID 6 elements. It
requires at least 8 disks.
119