HP Compaq Integrated Smart Array Controller - Manual (Page 124)

B-18 Compaq Integrated Smart Array Controller User Guide
Compaq Confidential – Need to Know Required
Writer: CDresden Project: Compaq Integrated Smart Array Controller User Guide Comments:
Part Number: 153236-001 File Name: i-appb Understanding Drive Arrays.doc Last Saved On: 8/27/99 11:35 AM
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
gigabyte. 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 Integrated Smart Array Controller;
they operate independently of the operating system.
Hot-Plug Drives
The Integrated Smart Array Controller supports hot-plug drives when 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 an Enclosure Model 4214T. 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 system server when removing or
installing the hot-plug replacement drives. If you turn off the storage system
while the server power is on, the Integrated Smart Array Controller marks all the
drives as “failed.” This could result in permanent data loss when the storage
system is turned back on.
Refer to the previous and next figure for conditions to safely replace a drive
using the three indicators on each of the hot-plug drive trays.