Toshiba Magnia 560S - Manual (Page 70)

Configuring SCSI Physical Drives 52
Configuring RAID Controller Kit-G
Maximize Capacity
RAID 0 achieves maximum drive capacity, but does not provide data redundancy.
Maximum drive capacity for each RAID level is shown below. Original equipment
manufacturer-level (OEM) firmware that can span up to four logical drives is assumed.
Table 5.4 describes the RAID levels, including the number of drives required, and the
capacity.
Table 5.4 Capacity for RAID Levels
RAID
Level Description Drives
Required Capacity
0 Striping
without
parity 1 – 15 (Number of disks) X (capacity of smallest
disk)
1 Mirroring 2 (Capacity of smallest disk) X (1)
5 Striping with
floating
parity drive 3 – 15 (Number of disks) X (capacity of smallest
disk) - (capacity of 1 disk)
10 Mirroring
and striping 4 – 14
(Must be a
multiple of 2.) (Number of disks) X (capacity of smallest
disk) / (2)
50 RAID 5 and
striping 6 – 15 (Must
be a multiple
of the number
of arrays.) (Number of disks) X (capacity of smallest
disk) – (capacity of 1 disk X number of
arrays)
NOTE: The maximum number of physical drives supported per
controller is 15.
Maximizing Drive Availability
You can maximize the availability of data on the physical disk drive in the logical array
by maximizing the level of fault tolerance. Table 5.5 describes the fault tolerance
available for each RAID level.
Table 5.5 Fault Tolerance for RAID Levels
RAID Level Fault Tolerance Protection
0 No fault tolerance.
1 Disk mirroring, which provides 100% data redundancy.