ESXi 5.1 SMV degrade slowly with until this only unusable disk latency issues. How do I troubleshoot and resolve?

Dell R710 servers

Reference Dell Perc 6 / i raid controllers

3 500 GB hard disks in a raid 5 configuration

2 data stores.

3 Red Hat linux 5.5 VMS servers.  Database intensive applications with e/s running high.

Symptom: Servers become very slow or does not respond over time. Each VM restarts does not help. A restart of the entire server ESXi provides immediate relief and the process begins again. I can only run the servers about a week before I have to restart again.

Disk latency may average in the range of 100 to 300 before a restart. After the reboot, the latency average in the range of 5 to 9 and slowly grows as the days pass.

Use memory and CPU look normal to me. Uniformly flat even when the servers seem to have trouble.

Any ideas what would cause this or how to fix?

Please go to esxtop on the server and press D to see the latency of disk.

FollowESXTOP - yellow bricks

to troubleshoot latency.

Tags: VMware

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