Hitachi XP P9500 User Manual page 339

on: Enabled
off: Disabled
For a standby host, or a host connected to the Thunder 9500V series, or
Hitachi AMS/WMS series storage system, we recommend that you
activate path health checking so that you can detect errors in paths
where I/Os operations do not occur.
When you specify on, specify the checking interval of path health
checking by specifying the parameter immediately following on. If you do
not specify a checking interval, path health checking is executed in the
following interval:
When the checking interval has not been specified before:
¢
Every 30 minutes (default setting)
When the checking interval has been specified before:
¢
The interval specified in the last time
The explanation for the following sub-parameter describes how to specify
the checking interval.
-intvl checking-interval
Specify the checking interval between path health checks. Specify a
value from 1 to 1440 minutes depending on the user environment.
When you change the checking interval, the new setting takes effect
immediately. When the checking interval is shortened and the
checking interval after the change (from the end of the previous path
health check) has already elapsed, the path health check will start
over.
The path health check interval setting remains stored in the system
even if you disable the function by changing the path health checking
to off. Therefore, when you re-enable path health checking and do
not change the interval, the path health interval stored in the system
is used.
-afb {on [-intvl checking-interval]|off}
Enables or disables automatic failback.
on: Enabled
off: Disabled
Enabling automatic failbacks might automatically place those paths that
were intentionally placed offline (for example, paths placed offline for
maintenance work) online.
When intermittent errors occur in paths or storage systems, path status
alternates between the online and offline status frequently, so I/O
performance might deteriorate.
Automatic failbacks are performed on the following types of paths:
Paths where an error occurred and for which the KAPL08022-E
¢
message was displayed.
Path where an error occurred during the startup of the HDLM
¢
manager.
Hitachi Dynamic Link Manager User Guide (for Solaris(R))
Command Reference
6-21