94 Configuring PERC 3
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Maximizing 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 (OEM) level firmware that can span up to

four logical drives is assumed. Table 7-7 displays the drives required, and

capacity for the various RAID levels.

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. The levels of fault

tolerance provided by the RAID levels are shown in Table 7-8.

Table 7-7. Drives and Capacities for Each RAID Level
RAID
Level
Description Drives
Required
Capacity
0 Striping without
parity
1 – 32 (Number of disks) X (capacity of
smallest disk)
1 Mirroring 2 (Capacity of smallest disk) X (1)
5 Striping with
floating parity
drive
3 – 32 (Number of disks) X (capacity of
smallest disk) - (capacity of 1
disk)
10 RAID 1 and
striping
4 – 16
(Must be a
multiple of
2)
(Number of disks) X (capacity of
smallest disk) / (2)
50 RAID 5 and
striping
6 – 256
(Must be a
multiple of
arrays)
(Number of disks) X (capacity of
smallest disk) – (capacity of 1
disk X number of arrays)
Table 7-8. Fault Tolerance Features for RAID Levels 0, 1
and 5
RAID
Level
Fault Tolerance Protection
0 No fault tolerance
1 Disk mirroring, which provides 100% data redundancy.