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Very high latency on FAS270

Hello,

I experience a terribly high latency from ESX hosts to my storage. The hosts have got 2 dedicated 1Gbps NICs to connect thgough a gb switch to the storage device. The DAVG (device latency) is from 3000 to 5000 ms. and VMs are completely unresponsive. Pings from the hosts to the storage are fine - 0.1ms. How can I troubleshoot it on the storage side?

Thanks for any idea.

Pawel

Re: Very high latency on FAS270

Can you run "sysstat –x 5" and paste us the results for about 1 minute?

Also, how many and what kind of disks are attached to the FAS270?

Re: Very high latency on FAS270

Hello,

Thanks for the feedback. I found the issue: it was network2 interface incorrectly set to... wait for it!... 100Mbps half duplex. When set to 1GBps on filer's side and on switch side everything is waiting perfectly.

Cheers,

Pawel

Re: Very high latency on FAS270

The old 100Mbps at half duplex trick, works everytime.