Adaptec 2120S Automatic rebuild on replacement, Available space, Bad segment, Battery, Blink

Glossary

automatic rebuild on replacement

In the event of a drive failure in a SAF-TE or SES enclosure attached to a controller with no available hot spares, if rebuild on replacement is enabled then when the failed drive is replaced with a new drive, a rebuild will start automatically.

available space

Unused space on an initialized disk from which logical devices (arrays) are created. When an array is deleted, the space that it used is returned to the available space pool.

Also called available segment.

B

bad segment

Segment that is in an unknown state.

background consistency check

Option that forces the controller to constantly check all portions of disks used by all arrays to see if the disks can return data from the blocks. On a fully-redundant RAID 5 with no dead segments, the controller will repair any data that it cannot read. See also consistency check command.

battery

In the event of a power failure, a battery supplies power to maintain data in the RAID controller’s cache, thereby permitting any dirty data in the cache to be flushed to the drives when power is restored. See also battery reconditioning, dirty data.

battery reconditioning

Periodic discharge/recharge that conditions the battery to attempt to regain lost capacity. Does not apply to all types of battery.

blink

Command that blinks the drive LEDs of all hard disks in a selected array or of a single selected hard disk.

bootable array

Array configured as the boot device.

A-2