Installation guide

Glossary
G-6 GAM Client v3.00 and WSAM User’s Manual
By not assigning a LUN to a logical drive on a particular host port, that
logical drive is made inaccessible to that host port.
Logical Drive States
The state of a logical (system) drive can be either ONLINE, CRITICAL, or
OFFLINE. Notice that the same term “online” is used for both physical and
logical drives.
Online: A Logical Drive is in an “online” state if...
All of its member drives are “online.”
Critical: A Logical Drive is in a “critical” state if...
It has been configured at RAID level 1, 3, 5, or 0+1; and
One (and only one) of its member drives is not “online.”
A logical drive is considered “critical” because any failure of another of its
member drives may result in a loss of data.
☛ Note
I/O operation can only be performed with logical
drives that are online or critical.
Offline: A Logical Drive is in an “offline” state if...
No data can be read from it or written to it.
System commands issued to offline logical drives are returned with an error
status: no operations can be performed on offline logical drives. A logical
drive can be “offline” under one of two situations described below:
• It is configured with a redundant RAID level (1, 3, 5, or 0+1), and two
or more of its member drives are not “online”; or
• It is configured at RAID level 0, JBOD, or in a spanned set (PCI only),
and one or more of its member drives are not “online.”