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My vmware esxi server suddenly freezed this friday. When I looked up, what happend. I figured out lot of these messages in log

Device t10.ATA_____WDC_WD10EARS2D00Y5B1
40670 performance has deteriorated. I/O latency 
increased from average value of 9400 
microseconds to 1219195 microseconds.
4.3.2012 20:07:47

I cant figure out, whether disk is failing or esxi has problems with disk driver. I am using Asus ASUS M2A-VM Disk controller shows on esxi as: SB600 NonRaid 5 SATA

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migrated from Mar 5 '12 at 17:19

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up vote 2 down vote accepted

It looks like one of your disks, a Western Digital i'd imagine, may be having physical issues. There are diagnostics available from WD you should probably run against the disk. Might be a good time to take a backup as well.

I sincerely doubt this is an issue with the "driver" as there are little to no configuration options there to be misconfigured.

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What version of vSphere? I'm assuming version 5 since this is a new warning to v5. Take a look at this conversation about the same issue.

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