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Finding controller, storage expansion enclosure, and drive
information
v IBM System Storage DS Storage Manager Version 10 Installation and
Host Support Guide (for storage subsystems with controller firmware
version earlier than 7.8x.xx.xx)
v IBM System Storage DS Storage Manager Version 10.8 Installation and
Host Support Guide (for storage subsystems with controller firmware
version 7.8x.xx.xx or later)
In addition, to download the latest version of the DS Storage Manager
host software, the DS3950 storage subsystem controller firmware and
NVSRAM, and the latest storage expansion enclosure ESM firmware,
go to the following Web site:
http://www.ibm.com/systems/support/storage/disk
The DS Storage Manager client provides the best way to diagnose and repair
storage-server failures. The software can help you do the following:
v Determine the nature of the failure
v Locate the failed component
v Determine the recovery procedures to repair the failure
Although the storage subsystem has Needs Attention LEDs, these LEDs do not
necessarily indicate which component has failed or needs to be replaced, or which
type of recovery procedure you must perform. In some cases (such as in the case
of a hard disk drive exceeding its PFAs), the Needs Attention LED does not turn
on. Only the DS Storage Manager client can detect the failure.
For example, the recovery procedure for a Predictive Failure Analysis (PFA) flag
(impending drive failure) on a drive varies depending on the drive status (hot
spare, unassigned, RAID level, current logical drive status, and so on). Depending
on the circumstances, a PFA flag on a drive can indicate a high risk of data loss (if
the drive is in a RAID 0 volume) or a minimal risk (if the drive is unassigned).
Only the DS Storage Manager client can identify the risk level and provide the
necessary recovery procedures.
Note: For PFA flags, the General-system-error LED and Drive Needs Attention
LEDs do not turn on, so checking the LEDs will not notify you of the
failure, even if the risk of data loss is high.
Recovering from a storage-server failure might require you to perform procedures
other than replacing the component (such as backing up the logical drive). The DS
Storage Manager client gives these procedures.
Attention: Not following the software-recovery procedures can result in data loss.
In addition, always replace a failing component as soon as possible to minimize
additional failures that might occur, causing loss of data access.
You can view a Storage Subsystem Profile to find controller, enclosure, and drive
information for the storage subsystem and attached storage expansion enclosures.
To view a Storage System Profile, perform the following steps:
1. Open the Storage Subsystem Management window from the DS Storage
Manager Enterprise Management window.
2. Select Storage Subsystem → View → Profile.
Chapter 4. Operating the storage subsystem
99
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