Quick Reference Guide

Mandatory
Options and
Arguments
Optional
Parameters
Valid Parameters
Arguments
Description
-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 extra 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. If there is only one array,
RAID 6 may be a better option than a
hot spare disk.
• 10 — RAID 10 is a stripe of mirrors.
Multiple RAID 1 mirrors are created,
and a RAID 0 stripe is created over
RAID 1 mirrors.
• 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.
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