EMC grab ESXi5

Hi All -

First post ever, so be gentle.  I'll provide you with as much detail as I can.

I recently updated 11 ESX4.0 servers to ESXi5.  The last cluster of 2 servers I upgraded were the only 2 that I had any problems with, and will describe.

After upgrading one of the 2 hosts in the cluster, I noticed that a data store was missing on the host after the upgrade to ESXi5.

I did the other host and it did the same thing.  I went to the storage configuration and the path to the missing datastore was in the "dead" status, with all other paths as "Active(I/O)"  All paths lead to the same EMC storage enclosure.  The servers themselves have 1 HBA (long story why no redundancy).

EMC wants me to do some grabs.  I downloaded the ESXi-Grab 1.2.1, ran the utility via command line using the syntax I found on this site.  It ran the utility but did nothing as far as collecting stats.  It ran for a grand total of 2 minutes.

I then read on here about the Powerlink software, so I downloaded that but having a hard time understanding how to run this.

I'm still not understanding why 1) some datastores are active and working while 1 decides to break and 2) why we can't present new storage to the host from our EMC storage.

I'd like to be able to get these grabs.  Any help or guidance would be much appreciated.