HP Hitachi Dynamic Link Manager Software Licenses - Manual (Page 371)

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.
To prevent intermittent errors from deteriorating I/O performance, we
recommend that you also enable intermittent error monitoring when the
automatic failback function is enabled. Intermittent error monitoring is
specifiable only when automatic failbacks are enabled.
For details on the relationship between automatic failbacks and
intermittent error monitoring, see Table 6-5 Relationship Between the
Setting for the Automatic Failback Function and Intermittent Error
Monitoring and the Executable Operations on page 6-26 .
When you specify on, specify the checking interval by specifying the
parameter immediately following on. If you do not specify a checking
interval, path statuses will be checked in the following way:
¢
When the checking interval has not been specified before:
Every minute (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 interval between path status checks.
-intvl checking-interval
Command Reference
6-23
Hitachi Dynamic Link Manager (for Solaris) User Guide