Avago Technologies AcceleRAID 170LP - Manual (Page 75)

Glossary
Manual No. DB11-000024-00 G-17
Megabyte
2
20
(1,048,576) bytes. One megabyte can store more than one million
characters. Abbreviated as M or MB.
Mirrored Cache
A cache memory that has duplicate data from another controller. In the event
of failure of the original controller, the second controller can take the cached
data and place it on the disk array.
Mirrored Hard Drive
Two hard drives the computer sees as one unit. Information is stored
simultaneously on each drive. If one hard disk drive fails, the other contains
all of the cached data and the system can continue operating.
Mirroring
The complete duplication of data on one disk drive to another disk drive, this
duplication occurs simultaneously with each write operation: each disk will
be the mirror image of the other (also known as RAID Level 1, see RAID
Levels). All Mylex RAID controllers support mirroring.
M.O.R.E.™
Mylex Online RAID Expansion, an advanced configuration mode that
allows expansion of any unconfigured or hot spare drive into the expandable
drive group while the controller is online with the host. For example, a
system using a five-disk-drive RAID set can add another disk drive to create
a six-disk-drive RAID set. The M.O.R.E. operation can be performed on all
RAID levels except JBOD.
Mylex’s Global Array Manager (GAM) supports two M.O.R.E. features:
• Expand Capacity allows logical drive expansion for FFx external
controllers only.
• Expand Array allows array expansion for both PCI and FFx external
controllers.