Mylex AcceleRAID 352, Installation Manual

Page: 76 / 92

G-12 AcceleRAID 352 Installation Guide
Mirroring
Refers to 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.
During the RAID set expansion process, which includes re-striping data
from the old (smaller) RAID set to the new (expanded) RAID set, the
controller continues to service host I/O requests.
MTBF
Mean Time Between Failures, the average time from start of use to failure in
a large population of identical systems, computers, or devices.
Narrow SCSI
8-bit wide standard SCSI. Compare with Fast SCSI , Fast/Wide SCSI , Ultra
SCSI , Ultra Wide SCSI , Ultra Fast SCSI , Ultra 160 SCSI , and WideSCSI .
NVRAM
Non-Volatile Random Access Memory, a memory unit equipped with a
battery so that the data stays intact even after the main power had been
switched off.