2. Notes and Cautions When Using This Product
Notes Related to Failures
Notes and Cautions When Using This Product
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• Example of finding the serial number using the command line
Enter "run local sysconfig" on the system management console. The "System Serial Number:"
string in the return value is followed by a 12-digit number, which indicates the serial number. A
unique serial number is assigned to each of the two controllers and both serial numbers are
required.
Notes Related to Failures
Drive Failure
Within the ETERNUS AX/AC/HX, installation of hot spare drives is mandatory and installation of two
or more hot spare drives is recommended.
If a drive failure occurs or a spare drive has been prepared, make sure that the reconstruction pro-
cess completed successfully. Usually, the amber LED that indicates an error turns on when a drive
failure occurs. If there are no spare drives, RAID degradation continues. If another drive (*1) in the
same RAID group fails in this state, the data in the volumes that belong to the relevant RAID group
will be completely lost. Therefore, use a spare drive that is in the normal state to immediately
replace the failed drive.
For spare drives, make sure to prepare ones with the same capacity as the data drives. If there are
no drives with the same capacity as the failed drives, drives with a larger capacity than the failed
drives are used for reconstruction. However, the larger drive is logically recognized as having the
same capacity as the failed drive. This drive is treated as having the same capacity as the failed drive
even after the failed drive is replaced and, as a result, spare drives with large capacity will become
insufficient. In this case, use the Rapid RAID Recovery function to copyback the data to the replaced
drive, restore the capacity of the large drive, and revert it back to a spare drive with a large capacity.
*1: For RAID-DP, two more drives have failed. For RAID-TEC, three more drives have failed.
Handling Failed Drives
Remove the failed drives from the drive shelf the next time the system stopped or when hot swap-
ping is performed. If the system is rebooted without removing the failed drive, the failed drive may
be recognized as a normal drive during the initial diagnosis while the system is booting up and the
system may configure the failed drive as a hot spare drive.
To prevent this, use the "disk fail" command to write "BROKEN" to the drive label of the failed drive.
Drives labeled as "BROKEN" are not reused.
RAID Degradation
RAID groups become degraded when the parity disks fail. The file access service is managed nor-
mally and continues even in the degraded mode.
If degraded mode cannot be recovered for the ETERNUS AX/AC/HX without spare drives or for the
ETERNUS AX/AC/HX where all the spare drives are used for the data recovery process, a message
urging the user to replace the drive is repeated every hour and the system automatically shuts down
after a certain period of time to protect data.
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