VM virtual disk errors

Hi all,

we've had the below errors over the weekend on a vm backup. v 6.21 cell manager and client both server 2008. I've never had a problem with this servers vm backup before. I've done some searching and came across the following link in which there is a suggestion it's a san problem:

http://h30499.www3.hp.com/t5/Data-Protector-Support-and-News/Data-Protector-7-0-1-backup-agent-for-vmware-retry-when-backing/td-p/5817143#.UxSXrs4QtS0

      Virtual Disk 'scsi0:1': Read Error. Retrying for the 1 time...[Warning] From: OB2BAR_VEPA_BAR@XXXXnet"/DataCentre"  Time: 01/03/2014 16:54:41

      Virtual Disk 'scsi0:1': Read Error. Retrying for the 2 time...

 [Warning] From: OB2BAR_VEPA_BAR@XXXX.cuh.net"/DataCentre"  Time: 01/03/2014 16:56:30

      Virtual Disk 'scsi0:1': Resumed read using transport method nbd.

 The thing is that after checking the errors (server had crashed due to lun space filling up) a stuck delta file (snapshot) was reported  attached to the server which had 'choked' the lun and caused the crash, and that the data protector vm backup snapshot caused the problem. I'm not so sure and am wondering could it have been a more general san issue?
Any help greatly appreciated.

 thanks,

 Steven