ADIC FileServ Version 4.0 600716 Rev A manual Troubleshoot System Performance

Administrative Tasks

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 -mcommand 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.

4-20 Trouble- shooting Tools 600716 Rev A