Upgrading Hard Drive Capacity - HP 273914-B21 - Smart Array 6404/256 RAID Controller User Manual

46 HP Smart Array 6400 Series Controllers User Guide
The number of drives in the array (for RAID 5 and RAID ADG)
Allow approximately 15 minutes per gigabyte for the rebuild process to be
completed. This figure is conservative, and newer drive models usually require
less time to rebuild.
System performance is affected during the rebuild, and the system is unprotected
against further drive failure until the rebuild has finished. Therefore, replace
drives during periods of low activity when possible.
When automatic data recovery has finished, the Online LED of the replacement
drive stops blinking and begins to glow steadily.
Failure of another drive during rebuild
If a non-correctable read error occurs on another physical drive in the array
during the rebuild process, the Online LED of the replacement drive stops
blinking and the rebuild abnormally terminates.
If this situation occurs, reboot the server. The system may temporarily become
operational long enough to allow recovery of unsaved data. In any case, locate
the faulty drive, replace it, and restore data from backup.

Upgrading hard drive capacity

You can increase the storage capacity on a system even if there are no available
drive bays by swapping drives one at a time for higher capacity drives. This
method is viable as long as a fault-tolerance method is running.
CAUTION: If the Online LED of the replacement drive stops
blinking and the amber Fault LED glows, or if other drive LEDs in the
array go out, the replacement drive has failed and is producing
unrecoverable disk errors. Remove and replace the failed replacement
drive.