We have DELL R730 with Vmware 6 with 6 disks of 1.2 TB of DELL with Raid 5 - VOLUME A .
On this Raid5 i installed VSA that i can access with iscsci - VOLUME B
It work fine but one day suddenly stop see the iscsci volume which set on the vsa .
but i can still controll the volume in the Hp managment and it show me all disk healthy and every thing is healthy and Normal .
but recently i got warning in the status which show "unrecoverable i/o " , and it start show me the data on one ESX and it didnt show me in the other and after a 2 minutes it stop show the volume B in both esxi .
i reboot the Hosting managment VSA and i get start again and it show me healthy and the same usage data but the esxi didnt recognize the Iscsi Volume .
the disk in the server are healthy and normal .
and i can access all the data in VOLUME A .
and also the VSA machine get up normally and quickly and can acces it .
I contaced hp support and they make for me another full snapshow or copy of the vsa on another disks .
Very important that i didnt touch the volume and didnt write anything on it after i face this .