Installation guide

Glossary
G-8 GAM Client v3.00 and WSAM User’s Manual
☛ Note
Ready State does not apply for Mylex External RAID
Controllers
Online: A disk drive is in an “online” state if it...
Is powered on; and
Has been defined as a member of a drive group; and
Is operating properly.
Standby: A disk drive is in a “standby” state if it...
Is powered on; and
Is able to operate properly; and
Was NOT defined as part of any drive group.
Dead: A disk drive is in a “dead” state if it...
Is not present; or
If it is present but not powered on; or
If it failed to operate properly and was ‘killed’ by the controller.
When the controller detects a failure on a disk, it “kills” that disk by
changing its state to “dead.” A drive in a dead state does not participate in
any I/O activity. No commands are issued to dead drives.
Rebuild: A disk drive is in a “rebuild” state...
While it is in the process of being rebuilt. During this process, data is
regenerated and written to the disk drive. This state is sometimes referred to
as ‘Write-Only’ (WRO).
RAID
RAID stands for Redundant Array of Independent Disks. Several different
forms of RAID implementation have been defined. Each form is usually
referred to as a “RAID level.” The basic RAID levels supported by Mylex
Disk Array Controllers are shown below.