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 DS4000 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, or current logical drive status). 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
DS4000 Storage Manager client can identify the risk level and provide the
necessary recovery procedures.
Note: For PFA flags, the General-system-error and Drive Needs Attention LEDs do
not turn on; 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
DS4000 Storage Manager client gives these procedures.
Attention: Not following the software-recovery procedures can result in data loss.
Firmware updates
DS4800 models 80, 82, 84 and 88 will be shipped with controller firmware version
6.23.xx.xx. The DS4800 model 80 does not have support for controller firmware
versions 6.15.xx.xx or 6.14.xx.xx.
Attention: Save the storage subsystem profile before performing any controller or
ESM firmware upgrades. Save the DS4800 storage subsystem profile and all
configuration (*.cfg) files to a server disk that will remain accessible in the event of
a DS4000 storage configuration failure. Do not save these files only to a LUN in the
DS4000 Storage Subsystem.
In order to ensure the optimal operation of the DS4800 and its attached storage
expansion enclosures, the storage expansion enclosure ESM firmware, the DS4800
controller firmware, the hard drive firmware, and the NVSRAM (for controllers only)
must be up to date. Go to the following Web site to get the latest updates:
www.ibm.com/servers/storage/support/disk/
Apply the necessary updates before configuring the storage subsystem arrays and
logical drives. Subscribe to My Support for automatic notifications of firmware or
Storage Manager software updates or any important information about your DS4000
subsystems (see “Product updates” on page 5).
116 IBM System Storage DS4800 Storage Subsystem: Installation, User’s, and Maintenance Guide
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