HP Compaq Integrated Smart Array Controller - Manual (Page 130)

B-24 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
Before replacing non-hot-plug drives, ensure that system power is Off. On all
non-hot-plug drives, be sure to check the SCSI ID jumpers to make sure that
the correct drive is being replaced.
CAUTION: Replacing the wrong physical drive may compromise fault tolerance
and result in data loss.
Also, be sure that the SCSI ID jumpers are set to the same SCSI ID on the
replacement drive. Note that the SCSI ID jumpers may be located at different
places on different drive models.
CAUTION: Always set the SCSI ID on the replacement drive to the same value
as the original failed drive. Failure to do this could result in SCSI ID conflicts that
compromise fault tolerance and result in a loss of data.
The capacity of replacement drives must be at least as large as the capacity of
the other drives in the array. The controller will immediately fail a
replacement drive with insufficient capacity, and Automatic Data Recovery
will not start.
CAUTION: If the Integrated Smart Array Controller has a failed drive, replace the
drive with a new or known-good replacement drive. In some cases, a drive that
has previously failed by the controller may appear to be operational after the
system is power-cycled, or after removal and reinsertion of a hot-plug drive.
However, this practice is highly discouraged as the use of such “marginal”
drives may eventually result in data loss.
Automatic Data Recovery
If a drive in a fault-tolerant configuration is replaced while the system power
is on Standby, the controller will display a Power-On Self-Test (POST)
message during the subsequent system startup. This indicates that the
replacement drive has been detected and that Automatic Data Recovery may
need to be started. Press F1 to initiate the background Automatic Data
Recovery process. If Automatic Data Recovery is not enabled, the logical
drive remains in a “ready to recover” state, and the same query displays the
next time the system starts.
Replacement drives are not considered to be “online” until Automatic Data
Recovery is completed, at which time the online LED stops blinking and is on
“solid.” Any drives that are not yet “online” are treated as if they are “failed”
when trying to determine whether fault tolerance will be compromised. For
example, in a RAID 5 logical drive with no spare and one drive rebuilding,
another drive failure at this time would result in a “failure” condition for the
entire logical drive.