ESX datastore issue

I have an ESX Server with local datastore. There are two HDD, one datastore has older copy of all server and the second one has active copy. I had to shut down VMs and host repeatedly due frequent lock up issue, until we found that the abrupt shutdown was caused by display drive and replaced it. Now the primary issue has been fixed but the VMs in active datastore does not come up and it takes forever to scan active datastore. Is it possible that repeated shutdown in the past might have done damage to VMFS partition, if so is there a way to repair VMFS partition without losing data. I even try to copy to another HDD but it freezes out and stops the operation
pchettriIT DirectorAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Have you checked the physical hardware disks that support the datastore this could be a possible disk fault?

What is the underlying datastore technology single disks or RAID
pchettriIT DirectorAuthor Commented:
single disk and physically HDD scan at time of motherboard replacement did not show error but it could still be possible case, as it has been shutdown and restarted many times.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
A single hard disk is prone to errors, and could cause the issues you have mentioned.

Frequent locks could be caused by failing sectors on disks.

You can use VOMA, to check VMFS for errors, if 5.1 or later...

see here

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pchettriIT DirectorAuthor Commented:
Is there any recommended tool to fix VMFS partition, if VOMA reports errors and bad clusters.
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