Installation guide

Manual No. 771961 G-1
Glossary
Active/Active Mode
See “Dual-Active (Duplex) Mode” .
BBU
See “Battery Backup Unit” .
Bad Block Table (or Bad Data Table)
There are two bad-block tables that the controller automatically maintains:
The Rebuild Bad Block Table stores information on bad blocks encountered
during a rebuild or consistency check process. The Write-Back Bad Block
Table stores information on all irrecoverable write-back errors that occur.
GAM provides an Error Table in which you can see Bad Block Data and
Request Sense Data.
Battery Backup Unit
A Battery Backup Unit is an add-on module that provides power to a Mylex
Disk Array Controller cache memory in the event of a power failure. The
battery backup module monitors the write back cache on the controller, and
provides power to the cache if it contains data not yet written to the drives
when power is lost.
Cache
Controller memory used to speed up data transfer to and from a disk.
Cache Flush
Refers to an operation where all unwritten blocks in a Write-Back Cache are
written to the target disk. This operation is necessary before powering down
the system.