Why a Apple RAID controller card cannot delete a RAID set?

Hi,
I just have a problem with my RAID set created with RAID Utility. My configuration is as follows:
     Mac Pro (early 2009 model) 2 x 2.66GHx Quad-Core, 16GB DDR3 1066Mhz Memory
     Apple RAID Card (HW Ver 2.00 and FW Ver E-1.3.20)
     1 x 1TB HD (Apple original) in Bay 1 as boot disk configured as Enhanced JBOD
     3 x 2TB HD (WD black series RE) in Bay 2 to Bay 4 configured as RAID 5
     Mac OS 10.7.4
The RAID Utility showed the following messages:
Degraded RAID set RS2 - No spare available for rebuild
Degraded RAID set RS2 - No spare available for rebuild
Degraded RAID set RS2
Drive 3:50014ee20352f5e8 missing - Previous drive status was inuse
Drive 3:50014ee20352f5e8 failure detected - Primary disk port unusable, previous drive status was inuse
Furthermore, RAID Utility shows:
1) Bay 1 (RS1 boot drive): Assigned, verified, Status good. viable (good)
2) Bay 2 (RS2 RAID 5): Assigned, verified, Status good, viable (degraded)
3) Bay 3 (RS2 RAID 5): Roaming, verified, Status good
4) Bay 4 (RS2 RAID 5): Assigned, verified, Status good, viable (degraded)
It also showed "Severe Events" message: "Degraded RAID set RS2 - No spare available for rebuild."
I tried to delete the RAID set using Apple RAID Utility but nothing happened. Can anyone help as I have to rebuild the RAID set from scratch? Thanks.

Hi flognoth,
flognoth wrote:
I have swapped the drives in bays and it is always bay 2. I'm coming to the conclusion that either the RAID card is failing in bay 2 or there is a Lion / Mountain Lion issue with the RAID card.
I would say this is not "a Lion / Mountain Lion issue with the RAID card", as I have an "Early 2009 Mac Pro" that is running Snow Leopard (10.6.8), fully patched, that is exhibiting a similar issue, after about 4 years of no such problems.
My RAID configuration is just like yours: 4x 2TB drives, with Bays 1 & 2 as RAID 1 and Bays 3 & 4 also as RAID 1. I keep losing either Bay 1 or Bay 2 disk, and after reboot typically see it as a good disk, in the green, but now unassigned to a RAID set, and marked as "Roaming". When I assign it as a spare, so far the RS1 RAID Set begins to rebuild, and things are okay for a short while.
Initially this happened about once a month, starting about 3 months ago, now it is a weekly or several times weekly event.
I've put in new disks (several), restored from a Time Machine backup, and just came in today to find the Bay 2 disk "Roaming".....
I'm going to try a new Mac Pro RAID card, as I have a spare - just looking for information about whether the replacement RAID card will pick up the RAID sets from info cached on the disks (I hope!), or whether I have to newly create the RAID Sets & Volumes, and then re-populate from Time Machine / the old disks.
I will say that I've been running 8 "Early 2008 Mac Pro" computers with RAID cards, each configured as above, and 4 "Early 2009 Mac Pro" computers similarly configured. These were all deployed between late 2008 and the beginning of 2010. I've had little difficulty with them, and they've been wonderful when an actual disk failure has occurred. I've had about 6 actual disk failures among all these setups.
cheers!

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