Exacq exacqVision Virtual User Manual Manuel d'utilisateur télécharger pdf (Page 37)

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4/12/2013

The VMS system writes large amounts of data to datastores attached to the host. Bad disk performance often shows up as high CPU

usage in your virtual machine, as the disks are not able to keep up. Disk latency is a good indicator of disk performance issues. Click

on the Advanced button and then Chart to open the Customize Performance Chart window. Under Chart Options, choose Disk. Then

choose the specific datastore object your exacqVision Virtual server is writing to. Under Counters, check Kernel Write Latency and

Physical Device Command Latency. Click Apply to view the statistics.

The Physical Device Command Latency should be less than 20ms, and the Kernel Command Latency should be less than 3ms. Higher

values indicate the datastore does not have the IOPS capacity to keep up with the load. Consider adding datastore capacity or

migrating virtual machines to a different datastore to lessen the load.

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Exacq exacqVision Virtual User Manual Manuel d'utilisateur Page 37