User`s guide

StorageWorks RAID Array 200 Subsystem Family
Logical RAID Drive States
The logical RAID drive or grouping of drives can be in different states. There are four
possible states as shown in Figure 1-1 and described in Table 1-1.
Figure 1-1. Logical RAID Drive State Diagram
Table 1-1. Logical RAID Drive States
States
Description
Optimal
The array is operating at an optimal level. This is the
condition during normal operation.
Degraded
The logical RAID drive is operating in degraded mode. The
array is still functioning, but a single drive could have
failed. This state is only valid for RAID levels that provide
redundancy (1, 0 + 1, 3, and 5). To return the logical RAID
drive unit to optimal, rebuild (reconstruction) of the data
must be done.
Dead
The logical RAID drive unit is no longer functioning. This
is typical when two or more drives have failed.
Rebuild (Reconstruction)
The controller is currently rebuilding the logical RAID drive
unit using good data and parity information. This state is
valid only for RAID levels, 1, 0 + 1, 3, and 5 which provide
redundancy.
1-6