Chaparral G5312, Руководство пользователя

Страница: 144 / 160

G- and K-Series User’s Guide
A-6
Mixing Disks from Different Manufacturers or
with Different Capacities
An array can contain different models of SCSI disks, even disks with different
capacities; for example, an array can include a 4-GB disk and a 9-GB disk. If you mix
disks with different capacities, the smallest disk determines the logical capacity of all
other disks in the array, regardless of RAID level. For example, if a RAID 0 array
contains one 4-GB disk and four 9-GB disks, the capacity of the array is equivalent to
about five 4-GB disks. To maximize disk capacity, use disks of similar size.
Mixing Disks on Different RAID Controller
Channels
The G5312 and K5312 RAID controllers have two device channels: 1 and 2; the
G7313 and K7313 have three device channels: 0, 1, and 2. An array can consist of
disks on different channels of the same RAID controller.
❒
RAID
1/0
Also
known as
mirrored 4 Combination of
RAID 0 (data
striping) and RAID
1 (mirroring) Highest
performance and
data protection
(can tolerate
multiple drive
failures) High redundancy
cost overhead;
because all data is
duplicated, twice
the storage
capacity is
required; requires
minimum of four
drives
Volume
Sets 1 Non-RAID, non-
striped mapping to
a single drive
(similar to JBOD) Ability to use a
single drive to store
additional data Not protected,
lower performance
(not striped)
Table A-1. Comparing RAID Levels (Continued)
RAID
Level
Min No.
of Drives Description Strengths Weaknesses