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3.12 Transition

At the occurrence of a fault, logical drives may be degraded and recovered by hot spare rebuild.

This results in separation of the configured slot positions of the logical drives. However,

creating spare drives of revertible type previously (see "3.15 Creating or Deleting Spare

Drives") allows logical drives to be returned to the original successive slot positions.

IMPORTANT: In the environment in which your system

is always subject to load, the process of transition may

take a long time and the performance may cause

performance decrement. In this case, the setting of

Revertible is recommended to be OFF when creating a

spare drive.

The transition is useful in the following situations.

1. Original state (RAID5)

Create spare drives of revertible type. (See "3.15 Creating or Deleting Spare Drives" for

details.)

2. Occurrence of fault in PD2

A fault occurs in a physical drive among those configuring a disk array. The disk array is

entered into the degraded state (logical drives are entered into the critical state).

Revertible

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Promise Technology PAM Guida Utente Pagina 61