Installation guide

Manual No. 775064 G-1
Glossary
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.
Cache Line Size
The Cache Line Size function is set in conjunction with stripe size and
represents the size of the data “chunk” that will be read or written at one
time. Under RAID EzAssist, the cache line size (also known as “segment
size”) should be based on the stripe size you selected. The default cache line
size for Mylex eXtremeRAID controllers is 8K.
Channel
Refers to one SCSI bus on a disk array controller. Each disk array controller
provides at least one channel.
Consistency Check
The process where the integrity of redundant data is verified. A consistency
check on a RAID 1 (mirroring) or RAID 0+1 (mirroring with striping)
configuration checks if the data on drives and their mirrored pair are exactly
the same. When using RAID 3 or RAID 5, a Consistency Check calculates
the parity from the data written on the disk drive and compares it to the
written parity. A Consistency Check using Mylex utilities such as Global
Array Manager (GAM) or RAID EzAssist gives the user the ability to have a
discrepancy reported, or additionally to have the discrepancy corrected.