Sorry to be leeching off this thread. Just want to share my experiences and concerns regarding the Dell EqualLogic.

I am facing same claims from the vendors that the Equallogic SAN performance will be increased the more disks you put in. I am not contesting the claims, what I am concerned about is the redundancy.

The usual practice in our environment is to put the data file in a separate physical array(RAID 5 or 10), the log file in a separate RAID 1 array and the same physical separation for the backups and tempDB.

From what I can understand, all files are placed in the SAN LUNs and there can only be ONE RAID level for the array. The EqualLogic will do the automatic load-balancing and it mean one physical disk can be holding portions of the data, log and backup files.

I could not see the redundancy here, what if in a RAID 5 array, two disks physically fail? Am I wrong here or there is something I am missing?