IBM System Storage Subsystem DS5020 - Manual (Page 129)

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.
Finding controller, storage expansion enclosure, and drive information
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.
A Storage Subsystem Profile window opens.
3. Select the Controllers tab.
4. Scroll through the list to find Board ID, Submodel ID, Product ID, and Product
revision for the storage subsystem.
5. Select the Enclosures tab.
6. Scroll through the list to find the Product ID for supported storage expansion
enclosures.
7. Select the Drives tab.
8. Scroll through the list to find the drive values such as Product ID.
Firmware updates
Attention: Save the storage subsystem profile before performing any controller or
ESM firmware upgrades. Save the DS5020 storage subsystem profile and all
configuration (*.cfg) files to a server disk that will remain accessible in the event of
a DS5020 storage configuration failure. Do not save these files only to a LUN in the
DS5020 storage subsystem.
For optimal operation of the DS5020 and its attached storage expansion
enclosures, the storage expansion enclosure ESM firmware, the DS5020 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.
Chapter 4. Operating the storage subsystem 99