Avago Technologies AcceleRAID 170LP - Manual (Page 71)

Glossary
Manual No. DB11-000024-00 G-13
Hot Replacement of Disks
The design of all Mylex controllers allows for the replacement of failed hard
disk drives without interruption of system service. In the event of a SCSI
drive failure on a properly configured system (where the data redundancy
features of the controller are used), the system generates a message to alert
the system operator.
When a replacement drive becomes available, the system operator can
remove the failed disk drive, install a new disk drive, and instruct the
controller to “rebuild” the data on the new drive, all without interrupting
system operations. Once the rebuild is complete, the controller will be
brought back into a fault tolerant state. See also Hot Swap.
Hot Spare
A physical disk drive not part of a system drive that the controller can use to
automatically rebuild a critical system drive. The hot spare drive must have
at least as much capacity as the largest disk drive in the array or the rebuild
may not start. See also Hot Standby and Standby Replacement of Disks.
Hot Standby
A redundant component in a fault tolerant storage system that has power
applied and is ready to operate, but which does not perform its task as long
as the primary component for which it is standing by is functioning properly.
See also Hot Replacement of Disks and Hot Spare.
Hot Swap
The exchange of a replacement unit in a storage system for a defective unit.
The exchange requires human intervention, but the system can continue to
perform its normal functions (compare with Auto Swap, Cold Swap, and
Warm Swap). See also Hot Replacement of Disks.
In-Line Terminator
A plug attached to the end of a SCSI cable in order to initiate active
termination. Used when SCSI devices on the cable do not have built-in
termination. See also Active Termination.