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4-20 Trouble- shooting Tools 600716 Rev A
Troubleshoot
System
Performance
If the DataClass mintime parameter for the DataClass groups
and
cron setting that govern the frequency of the migration
policy application for a DataClass group are set to too short a
time, FileServ may be invoked too frequently. This is known as
thrashing because the policy is applied so frequently that it
prevents other system operations that have lower priority.
If thrashing occurs with a number of DataClass groups, it can
cause a major impact on system performance. If system
performance is degraded, the
syslog file can be monitored for
messages that indicate when the policy is applied.
Step 1. If
syslog indicates that a low block call-out was
issued, use the UNIX df -a (disk free space)
command to monitor the disk fill level of all of the
file systems.
Step 2. Run the fspolicy command.
Use the appropriate options as needed. For command
information, refer to the Command Reference book.
Step 3. Run the
fsmodclass -m command with the
DataClass group identifier to shorten the time limit
for the mintime parameter for DataClass groups in
the file system where this parameter is set relatively
high.