Hitachi MK-96RD617-08 Causes of Invalid Monitoring Data

Causes of Invalid Monitoring Data

Invalid Values of

Monitoring Data Probable Causes

The monitoring data in the

CSV file includes "-1".

The value "-1" indicates that Performance Monitor failed to obtain

monitoring data. Probable reasons are:

 Performance Monitor attempted to obtain statistics when an

operation for rebooting the disk array is in progress.

 Performance Monitor attempted to obtain statistics when a heavy

workload is imposed on the disk array.

 There is no volume in a parity group.

 Just after the CUs to be monitored were added, the Export Tool failed

to save files that contain monitoring data for all volumes or journal

volumes used by remote copy software (i.e., TrueCopy, TrueCopy for

z/OS, Universal Replicator, or Universal Replicator for z/OS). For

details about the files, see Table 7-10, Table 7-14, and Table 7-15.

 If Disable is selected to stop monitoring in Monitoring Switch on

the Monitoring Options window and longrange is specified as the

gathering interval, the monitoring data for the period when

Performance Monitor stops monitoring is "-1".

 If you added the CU during monitoring, specified longrange as the

gathering interval, and collected monitoring data, the value

"-1" is displayed as the monitoring data before the CU was added.

The monitoring data in the

CSV file includes "-3".

The value "-3" indicates that Performance Monitor failed to obtain

monitoring data for the following reason:

If IOPS is 0 (zero), the Response Time that is included in the

monitoring data for LUs, LDEVs, ports, WWNs, or external volumes is "-

3". Because IOPS is 0 (zero), the average response time becomes

invalid.

The monitoring data in the

CSV file includes "-4".

The value "-4" indicates that Performance Monitor failed to obtain

monitoring data for the following reason:

If the period for the monitoring data that is specified with the Export

Tool does not match the collecting period for monitoring data, the

Export Tool cannot collect the monitoring data. If data of SVP is updated

while the monitoring data is being collected, the collected monitoring

data near the collection start time is "-4".