User guide

D-18 Compaq Smart Array 431 Controller User Guide
Automatic Data Recovery
After you replace a failed drive, automatic data recovery reconstructs the data
and places it on the replaced drive. This allows a rapid recovery to full
operating performance without interrupting normal system operations.
In general, the time required for a rebuild is approximately 15 minutes per GB.
The actual rebuild time, however, is dependent upon the Rebuild Priority set,
the amount of I/O activity occurring during the rebuild operation, the number
of drives in the array (RAID 5) and the disk drive speed.
CAUTION: You must specify RAID 5 or RAID 1 through the Array Configuration
Utility to make the recovery feature available. The drive failure alert system and
automatic data recovery are functions of the Smart Array 431 Controller; they
operate independently of the operating system.
Hot-Pluggable Drives
The Smart Array 431 Controller, used with a Compaq ProLiant Storage
System/U (Models U1, U2, or UE), a Rack-Mountable Compaq ProLiant
Storage System/U, a Compaq ProLiant Server, a Rack-Mountable Compaq
ProLiant Server, an Enclosure Model 4214R, or and Enclosure Model 4214T,
supports hot-pluggable drives. You can install or remove these drives without
turning off the system power. This feature is a function of the servers
mentioned above, and operates independently of the operating system.
CAUTION: Do not turn off the Compaq Storage Systems server when removing
or installing the hot-pluggable replacement drives. If you turn off the Storage
System while the server power is on, the Smart Array 431 Controller marks all
the drives as “failed.” This could result in permanent data loss when the
Storage System is turned back on.
See Figure D-11 and D-12 for conditions to safely replace a drive using the
three indicators on each of the hot-pluggable drive trays.