When An Intermittent Error Does Not Occur - Hitachi XP P9500 User Manual

When an Intermittent Error Does Not Occur

If an error does not occur on a path a specified number of times within a
specified interval, an intermittent error will not occur. In such a case, the
error monitoring will finish when the specified error-monitoring interval
finishes, upon which the number of errors is reset to 0. If an error occurs on
the path again at a later time, error monitoring will resume when the path is
recovered from the error via an automatic failback.
If it takes a long time for an error to occur, an intermittent error can be more
easily detected by increasing the error-monitoring interval or by decreasing
the number of times that the error needs to occur.
Figure 2-11 What Will Happen When an Intermittent Error Does Not Occur on
a Path on page 2-18
does not occur. For this example, the path is determined to have an
intermittent error if the error occurs three or more times in 30 minutes. The
events that occur are described by using the time arrows.
Figure 2-11 What Will Happen When an Intermittent Error Does Not Occur
As shown in
Not Occur on a Path on page
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), 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 operations are continuously being issued to such an LU, the
count for the number of times that the error occurs might be started even
though the path will not be 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
2-18
shows what will happen when an intermittent error
Figure 2-11 What Will Happen When an Intermittent Error Does
HDLM Functions
Hitachi Dynamic Link Manager User Guide (for VMware(R))
on a Path
2-18, normally, the count for the number of