Detecting Errors By Using Path Health Checking - Hitachi XP P9500 User Manual

Hitachi dynamic link manager software user's guide for linux (6.x) (hit5203-96004, october 2011)

Hide thumbs Also See for XP P9500:

Table of Contents

2. HDLM Functions

2.10 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

For example, in a normal state, I/O operations are not performed on the paths coming

from the standby host in the cluster configuration or on non-owner paths (that is, some

of the paths that access a Thunder 9500V series and Hitachi AMS/WMS series storage

system). Because of this, for the standby host or for a host connected to non-owner

paths, we recommend that you use path health checking to detect errors. This enables

the system to use the most up-to-date path-status information when selecting the next

path to use.

You can configure path health checking by executing the

operation. For details on the

Environment).

operation to check the path error.

operation, see 6.6 set (Sets Up the Operating

. You can use the

Table of Contents

Dynamic link manager