HP XP P9500 Storage - Manual (Page 48)

As shown in Figure 2-12 What Will Happen When an Intermittent Error Does
Not Occur on a Path on page 2-25 , normally, the count for the number of
times that an error occurs is started after the path is first recovered from an
error by using the automatic failback function. However, if all the paths
connected to the LU are in the Offline(E), Online(E), or Offline(C) status
(which is due to the disconnection of the paths or some other reason), the
paths will not be recovered and put back online by using the automatic
failback function. If I/O are continuously issued to such a LU, the number of
times that the error is to occur might be counted even if the path is not
placed online. If the number of times that the error occurs reaches the
specified value, the path is determined to have an intermittent error. In such
a case, remove the cause of the error, and then manually place the path
online.
When the Conditions for an Intermittent Error Are Changed During Error
Monitoring
When the conditions for an intermittent error are changed during error
monitoring, the number of errors and the amount of time that has passed
since the error monitoring started are both reset to 0. As such, the error
monitoring will not finish, and it will start over by using the new conditions.
If the conditions are changed while error monitoring is not being performed,
error monitoring will start up again and use the updated conditions after any
given path is recovered from an error by performing an automatic failback.
The figure below shows the action taken when the conditions for an
intermittent error are changed during intermittent error monitoring. For this
example, the conditions have been changed from 3 or more errors in 30
minutes, to 3 or more errors in 40 minutes. The events that occur are
described by using the time arrows.
Figure 2-13 What Will Happen When Conditions Are Changed During Error
Monitoring
2-26
HDLM Functions
Hitachi Dynamic Link Manager User Guide for Solaris ®