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Title
When performing a Virtual Machine(VM) SAN restore, "Clear lazy zero" is repeated in VMware vCenter -
Description
When attempting a SAN restore of a VM to a VC using SAN transport mode , the performance drops and the message "Clear lazy zero"appear in VC tasks and events
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Cause
The cause of this is that data remaining on the physical disk or LUN is not erased during creation, but is zeroed out at a later time during virtual machine read and write operations.
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Resolution
To work around the performance issue, please perform a redirect restore to a ESX server instead of a vCenter.