NEC Storage Software PathManager, User Manual

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Chapter 3 Functions of NEC Storage PathManager
order of priority, from the highest to the lowest for each I/O. After the path with the lowest priority is used,
the order returns to the path with the highest priority.
When path priority or path state has been changed by the spscmd described below, the result will
immediately be in effect for the currently used path.
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2.2 D
D
isabling priority
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When you wish to have particular paths unused due to maintenance work for example, use the -notavail
option of the spscmd to temporarily disable priority. The state of a path with deactivated priority will turn
from "In use" or "Active" to "Standby."
Standby
In use
Failures
Unavailable
Available
-notavail
Active
Figure 3-2 -notavail option
In the following example, priority of the path 4:0:0:0 has been deactivated. After executing the -notavail
option, the path 4:0:0:0 will have the "@" symbol which stands for a standby state. Also in the example, the
">" symbol indicates that the path 5:0:1:0 is in use even though the path 4:0:0:0 has a higher priority than the
path 5:0:1:0.
III-8
C:\>spscmd -getlun
*** LogicalUnit #0 ***
> 0: Priority=2, PathNumber=4:0:0:0
1: Priority=1, PathNumber=5:0:1:0
C:\>spscmd -notavail 4:0:0:0
C:\>spscmd -getlun
*** LogicalUnit #0 ***
@ 0: Priority=2, PathNumber=4:0:0:0
> 1: Priority=1, PathNumber=5:0:1:0
C:\>