|Look at the link below for information on Western Digital Enterprise level hard drives. Immediately below is an excerpt from the link. This is one of the most common reason for RAID array failure. Those drives may actually still be good. Just not up to the RAID 5 needs.|
“RAID-specific, time-limited error recovery (TLER) - Prevents drive fallout caused by the extended hard drive error-recovery processes common to desktop drives”.
For info on all WD enterprise drives look at the link below.
I don't know of any way to get the array working or to save any data. As you know the data is distributed across the whole array with some fault tolerance. You have exceeded the fault tolerance.
Hope some one else can give you better news.