Detecting errors by using path health checking, Detecting errors by using path health checking -29 – HP XP P9500 Storage User Manual

Page 51

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User operation

Number of

errors and time

passed since

error

monitoring

started

Information

about paths

not subject to

automatic

failback

Placing the path Online

while intermittent error

monitoring is being

performed

Inherited

(Not applicable)
If a path has

been removed

from the paths

subject to

automatic

monitoring, that

path is no

longer

monitored.

Restarting the HDLM manager

Reset

#3

Inherited

Restarting the host

Reset

Reset

#1

When you turn the intermittent error monitoring function off, information

about paths not subject to automatic failback will be reset. If you do not

want to reset the information about paths not subject to automatic

failback when you turn the intermittent error monitoring function off,

change the target paths to Offline(C).

#2

The number of errors and the time passed since error monitoring had

started are both reset to 0, and then monitoring restarts from the time

the setting change is made in accordance with the changed monitoring

conditions.

#3

The number of errors and the time passed since error monitoring had

started are both reset to 0, and then monitoring restarts from the time

the HDLM manager starts.

Detecting Errors by Using Path Health Checking

HDLM can check the status of paths for which I/O operations are not being

performed at regular intervals. This function is called path health checking.

Without path health checking, an error cannot be detected unless an I/O

operation is performed, because the system only checks the status of a path

when an I/O operation is performed. With path health checking, however, the

system can check the status of all online paths at regular intervals regardless

of whether I/Os operations are being performed. If an error is detected in a

path, the path health checking function switches the status of that path to
Offline(E) or Online(E). You can use the dlnkmgr command's view

operation to check the path error.

HDLM Functions

2-29

Hitachi Dynamic Link Manager User Guide (for Linux(R))

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