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cyriltam
Contributor
Contributor

VMWare IO planning

Can DRS transfer VM to another ESX server when the IO is busy? Or VM is using another method to do it?

THX :smileygrin:

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jrenton
Hot Shot
Hot Shot

ESX uses a dedicated 1Gb network port for V-Motion so there is no conflict with server IO and the V-Motion process.

If there is heavy IO to the server the migration may take longer. The V-Motion process will look for a lull in server resource usage and choose that moment to switch the virtual hardware over.

Even with high IO there will be a lull and the server will get migrated.

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jhanekom
Virtuoso
Virtuoso

Your question is a bit ambiguous, so I'm going to attempt to answer the side of it that hasn't been addressed yet.

DRS currently only takes two metrics into account when deciding whether or not to migrate a virtual machine from one ESX server to another: Memory utilisation and CPU utilisation.

There are apparently plans to add network and disk utilisation as measured metrics in future, but for all practical reasons the most important bases are already covered by making decisions based on memory and CPU utilisation.

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dmorgan
Hot Shot
Hot Shot

This is true, DRS and VMotion only take into account memory and cpu utilization. However, even with high network and disk utilization, you would still be able to migrate, as the previous poster noted, but it would just take longer to complete the migration.

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