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Virtualization, Cloud, Infrastructure and all that stuff in-between

My ramblings on the stuff that holds it all together

Slow vMotion..

 

Note to remember, don’t forget to check the duplex settings on NICs handling your vMotion traffic.

My updated clustered ESX test lab is progressing (more posts on that in the next week or so)… and I’m kind of limited in that I only have an old 24-port 100Mb Cisco hub for the networking at the moment.

vMotion warns about the switch speed as a possible issue.

image

I had my Service Console/ vMotion NICit forced to 100/full and when I 1st tried it vMotion took 2hrs to get to 10%, I changed it to auto-negotiate whilst the task was running and it completed without breaking the vMotion task ain a couple of seconds, dropped only 1 ping to the VM I moved.

Cool, it’s not production or doing a lot of workload but useful to know despite the warning it will work even if you’ve only got an old hub for your networking, and worth remembering that Duplex mis-matches can literally add hours and days onto network transfers.

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One response to “Slow vMotion..

  1. Alastair February 18, 2009 at 1:19 am

    Amen to that one.
    I’d been using forced link speed & duplex to identify NICs to switch ports & hadn’t reset one NIC from 10MB half duplex. VMotion was sure slow on that host

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