NEC Storage Software PathManager User Manual download pdf (Page 26)

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.

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:\>

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NEC Storage Software PathManager User Manual Page 26