IBM System Storage DS3300, Installation, User'S, And Maintenance Manual

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volume) or a minimal risk (if the drive is unassigned). Only the DS3000 Storage
Manager software can identify the risk level and provide the necessary recovery
procedures.
Note: For PFA flags, the system-error LED and hard disk drive status LEDs are not
lit, so checking the LEDs will not notify you of the failure, even if the risk of
data loss is high.
Recovering from a storage-subsystem failure might require you to perform
procedures other than replacing the component (such as backing up the logical
drive). The DS3000 Storage Manager software provides 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.
Firmware updates
Attention: Save the storage subsystem profile before you perform any controller
or ESM firmware upgrades. Save the profile and all configuration (.cfg) files to a
server disk that will remain accessible in the event of a DS3300 storage
configuration failure. Do not save these files only to a LUN in the storage
subsystem.
To ensure the optimal operation of the storage subsystem and its attached storage
expansion enclosures, the storage expansion enclosure ESM firmware, the DS3300
controller firmware, the hard disk drive firmware, and the NVSRAM (for controllers
only) must be up-to-date. Go to http://www.ibm.com/servers/storage/support/disk/ to
get the latest updates.
Always see the readme files that are included with the firmware packages for the
most up-to-date information about firmware prerequisites, firmware update
instructions, download-sequence information, and host I/O restrictions, if any. Apply
the necessary updates before you configure 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 the DS3000
storage subsystems (see “Product updates” on page 5).
Attention: Failure to observe the limitations, prerequisites, sequences, and
dependencies in the readme file might result in a loss of data access.
Unless the readme file contains special requirements for the sequence in which you
upgrade firmware, perform firmware upgrades in the following sequence:
1. ESM firmware for the storage expansion enclosures
2. Controller firmware
3. Controller NVSRAM
4. Drive firmware
Troubleshooting the storage subsystem
The DS3000 Storage Manager software is the best way to monitor the storage
subsystem, diagnose a problem, and recover from a hardware failure. Run the
DS3000 Storage Manager continuously, and frequently check the configuration
status.
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System Storage DS3300 Storage Subsystem: Installation, User’s, and Maintenance Guide