Specifications

Recovering from Hard Drive Failure
84 MSA1000 Reference Guide
Automatic Data Recovery
Automatic Data Recovery is an automatic background process that rebuilds data
onto a spare or replacement drive when another drive in the array fails. The hard
drive that is being rebuilt blinks once per second.
If a drive in a fault-tolerant configuration is replaced while the system power is
off, a front-panel display message will be displayed during the next system
startup. Automatic Data Recovery will be started.
When Automatic Data Recovery is completed, the online indicator of the
replacement drive will stop blinking and begin to glow steadily.
In general, approximately 15 minutes is required to rebuild each gigabyte. The
actual rebuild time depends upon:
■ The rebuild priority level (high or low) of the logical drive
■ The amount of I/O activity occurring during the rebuild operation
■ The disk drive speed
■ The number of drives in the array (for RAID 5 and RAID ADG)
Failure of Automatic Data Recovery
If the online indicator of the replacement drive stops blinking during Automatic
Data Recovery, there are two possible causes:
■ The replacement drive is failed (amber failure indicator illuminated or other
indicators go out) and is producing unrecoverable disk errors. Remove and
replace the failed replacement drive.
■ The Automatic Data Recovery process may have abnormally terminated, due
to a non-correctable read error (such as a SCSI bus signal integrity problem)
from another physical drive during the recovery process.
Reboot the system and retry Automatic Data Recovery. If this does not work,
backup all data on the system, do a surface analysis (using User Diagnostics), and
restore the data from backup.