I'm having an issue with my ESXi 4.1 hosts losing the datastore with FC SAN after a power outage. All 3 hosts disconnect so it's definitely a SAN issue. I've tried to resolve the issue on the SAN side with the SAN software support and Adaptec hardware support. No luck there.

So I'm stuck with a SAN that will randomly disconnect the volume. I need to get the virtual machines (VMDK files) from the datastore. The problem is I can only get 5-20% before the data store disconnects.

I have backups that are slightly older that I can use to replicate the VMDK differences to.

What has not worked so far:

1. Powering up the VMs, will boot up for 5-15 minutes then freeze
2. vCenter migrate or clone of VM, will fail after similar period of time
3. vCenter copy/paste of VMDK. Was able to get one 30GB VMDK and no luck after that.
4. vMware Data Recovery. Fails at low %, can't resume, so next backup starts from begining.
5. Veeam Backup & Recovery. Same as above, no resume function.

If I can just find a backup solution that will resume from the failed spot that would solve my issue. Anyone have any ideas that I could try?

EDIT 1

The SAN is Open-E DSS 6 running on a Supermicro 24 drive enclosure with 4 port Qlogic FC. Adaptec 52445 RAID card.