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prakash9339
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why the data store/LUN locked automatically

Some of the VM’s are not accessible and some are very slow after investigating everything it’s a SAN issue data store is locked so LUN reset performed to clear lock to a SAN/ LUN

Issue got resolved after rest LUN.

Now I want to know why the data store/LUN locked automatically

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SG1234
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you might want to check if a host got isolated recently from the network - HA sometimes tries endlessly to poweron the VMs elsewhere and the locks prevent it from doing so -- other causes is a very busy SAN array not finding CPU time to release the locks....the vmkernel log from the hosts should help ..also look for VC event for host isolation

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SG1234
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can you please provide few more details - SAN array /model etc and also ESX version

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prakash9339
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esxi 4.1

San array model i will let you know

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SG1234
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you might want to check if a host got isolated recently from the network - HA sometimes tries endlessly to poweron the VMs elsewhere and the locks prevent it from doing so -- other causes is a very busy SAN array not finding CPU time to release the locks....the vmkernel log from the hosts should help ..also look for VC event for host isolation

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