Raid Volumes Randomly Dismounting

Okay first a warning .. this is going to be a long post!
Overview: When my raid is connected through my Fibre Channel Switch it randomly dismounts.
Specifics:
Xserve G5 (10.4.7) with the LSI Dual-Channel 2GB Fibre Channel PCI-X HBA & Fibre Channel Utility 2.0
Xserve RAID - Each side with its own Raid 5 , hot spare - no masking & latest firmware
Exabyte Magnum 224 FC
Qlogic Sanbox 5200 Series (12 port) - Latest Firmware (configured with two zones (port not WWN) ; Zone 1: Port 1 HBA, Both Xraid | Zone 2: Port 0 HBA, Exabyte
Background : This used to ALL work! Recently we began to experience drastic slow downs when writing to the raid and common sense not working free space, which was the problem, was the last thing I checked. Before that though I tried swapping cables, replacing the raid controller, redoing zoning, straight connect - Obviously none of this was the issue. *note here: at this point I am using an identical Fibre Channel Card in my Xserve from my G4 - a careless maneuver broke the Apple installed card whilst it was laying on a table.*
When I got things working (made room on the volume) I happened to be in a configuration the circumvented the switch.. raid directly into the host and things , as said, worked fine. The next night I took the systems down to put everything on the switch again to allow a back-up to be ran. Now is when the current behavior begins. Randomly and without recognizable patterns both raid volumes would dismount from the host. Checking Raid Admin shows the volumes as being in order and all lights are green.
This time I fear my switch has gone and after time spent with Qlogic (and zilliions of different configurations) a new switch is sent out in the mean time back to a straight connection and things are working fine. New switch arrives, is configured, and immediately problem persists. Qlogic/Apple suggest the midplane on the raid is bad (even though it works straight through). I happen to have a brand new in box XRAID (with current firmware) so I set that up put in the drives from the old raid and the problem persists again when plugged into the switch. Direct to host things work fine.
So I read some documentation on Apple and Fibre channel and made a few changes to HBA ports and Switch Port Settings and came to the following scenario... Volumes stayed mounted through an entire work day, but after a brief time into a backup the volumes unmounted.
Here is some more specific info about my exact setup as it last failed...
ZONE 1 (zoned by port not WWN)
Switch Ports 0, 1, 2
HBA Port 1 into Switch Port 0
Raid into Switch Ports 1, 2
All ports are identifying themselves to switch as switch topology
HBA port configured as Topology: Point-to-Point, Speed: 2Gb/s
SW Port 0 configed as State: Online, Speed: auto, Type: Detect, I/O Stream Guard: Enable, Device Scan: Disable
SW Port 1, 2 configed as State: Online, Speed: auto, Type: Detect, I/O Stream Guard: Auto, Device Scan: Enable
ZONE 2 (zoned by port not WWN)
Switch Ports 8, 9
HBA Port 0 into Switch Port 9
Exabyte into Switch Port 8
Port 8 identifying as Loop topology, 9 as switch
HBA port configured as Topology: Auto, Speed: Auto
SW Port 8 configed as State: Online, Speed: auto, Type: Detect, I/O Stream Guard: Auto, Device Scan: Enable
SW Port 9 configed as State: Online, Speed: auto, Type: Detect, I/O Stream Guard: Enable, Device Scan: Disable
I realize that some of these settings, particularly those on the HBA are different between ports, but we have tried virtually every combination (I think)
Around the time of the backup job system.log on the host has these entries:
Mar 7 17:55:41 files kernel[0]: FusionMPT: Notification = 5 (External Bus Reset) for SCSI Domain = 3
Mar 7 17:55:41 files kernel[0]: FusionMPT: External Bus Reset for SCSI Domain = 3
Mar 7 17:55:41 files kernel[0]: FusionMPT: Notification = 7 (Link Status Change) for SCSI Domain = 3
Mar 7 17:55:41 files kernel[0]: FusionFC: Link is down for SCSI Domain = 3.
Mar 7 17:55:41 files kernel[0]: FusionMPT: Notification = 8 (Loop State Change) for SCSI Domain = 3
Mar 7 17:55:41 files kernel[0]: FusionFC: Loop Initialization Packet for SCSI Domain = 3.
Mar 7 17:55:41 files kernel[0]: FusionMPT: Notification = 9 (Logout) for SCSI Domain = 3
Mar 7 17:55:41 files kernel[0]: FusionMPT: Notification = 7 (Link Status Change) for SCSI Domain = 3
Mar 7 17:55:41 files kernel[0]: FusionFC: Link is active for SCSI Domain = 3.
Mar 7 17:55:41 files kernel[0]: FusionMPT: Notification = 6 (Rescan) for SCSI Domain = 3
Mar 7 17:55:41 files kernel[0]: FusionMPT: Notification = 5 (External Bus Reset) for SCSI Domain = 3
Mar 7 17:55:41 files kernel[0]: FusionMPT: External Bus Reset for SCSI Domain = 3
Mar 7 17:55:41 files kernel[0]: FusionMPT: Notification = 7 (Link Status Change) for SCSI Domain = 3
Mar 7 17:55:41 files kernel[0]: FusionFC: Link is down for SCSI Domain = 3.
Mar 7 17:55:41 files kernel[0]: FusionMPT: Notification = 8 (Loop State Change) for SCSI Domain = 3
Mar 7 17:55:41 files kernel[0]: FusionFC: Loop Initialization Packet for SCSI Domain = 3.
Mar 7 17:55:41 files kernel[0]: FusionMPT: Notification = 9 (Logout) for SCSI Domain = 3
Mar 7 17:55:41 files kernel[0]: FusionMPT: Notification = 7 (Link Status Change) for SCSI Domain = 3
Mar 7 17:55:41 files kernel[0]: FusionFC: Link is active for SCSI Domain = 3.
Mar 7 17:55:41 files kernel[0]: FusionMPT: Notification = 6 (Rescan) for SCSI Domain = 3
Mar 7 17:55:41 files kernel[0]: FusionMPT: Notification = 5 (External Bus Reset) for SCSI Domain = 3
Mar 7 17:55:41 files kernel[0]: FusionMPT: External Bus Reset for SCSI Domain = 3
Mar 7 17:55:41 files kernel[0]: FusionMPT: Notification = 7 (Link Status Change) for SCSI Domain = 3
Mar 7 17:55:41 files kernel[0]: FusionFC: Link is down for SCSI Domain = 3.
Mar 7 17:55:41 files kernel[0]: FusionMPT: Notification = 8 (Loop State Change) for SCSI Domain = 3
Mar 7 17:55:41 files kernel[0]: FusionFC: Loop Initialization Packet for SCSI Domain = 3.
Mar 7 17:55:41 files kernel[0]: FusionMPT: Notification = 9 (Logout) for SCSI Domain = 3
Mar 7 17:55:41 files kernel[0]: FusionMPT: Notification = 7 (Link Status Change) for SCSI Domain = 3
Mar 7 17:55:41 files kernel[0]: FusionFC: Link is active for SCSI Domain = 3.
Mar 7 17:55:41 files kernel[0]: FusionMPT: Notification = 6 (Rescan) for SCSI Domain = 3
Mar 7 17:55:41 files kernel[0]: FusionMPT: Notification = 5 (External Bus Reset) for SCSI Domain = 3
Mar 7 17:55:41 files kernel[0]: FusionMPT: External Bus Reset for SCSI Domain = 3
Mar 7 17:55:41 files kernel[0]: FusionMPT: Notification = 7 (Link Status Change) for SCSI Domain = 3
Mar 7 17:55:41 files kernel[0]: FusionFC: Link is down for SCSI Domain = 3.
Mar 7 17:55:41 files kernel[0]: FusionMPT: Notification = 8 (Loop State Change) for SCSI Domain = 3
Mar 7 17:55:41 files kernel[0]: FusionFC: Loop Initialization Packet for SCSI Domain = 3.
Mar 7 17:55:41 files kernel[0]: FusionMPT: Notification = 9 (Logout) for SCSI Domain = 3
Mar 7 17:55:41 files kernel[0]: FusionMPT: Notification = 7 (Link Status Change) for SCSI Domain = 3
Mar 7 17:55:41 files kernel[0]: FusionFC: Link is active for SCSI Domain = 3.
Mar 7 17:55:41 files kernel[0]: FusionMPT: Notification = 6 (Rescan) for SCSI Domain = 3
Mar 7 17:55:42 files kernel[0]: FusionMPT: Notification = 5 (External Bus Reset) for SCSI Domain = 3
Mar 7 17:55:42 files kernel[0]: FusionMPT: External Bus Reset for SCSI Domain = 3
Mar 7 17:55:42 files kernel[0]: FusionMPT: Notification = 7 (Link Status Change) for SCSI Domain = 3
Mar 7 17:55:42 files kernel[0]: FusionFC: Link is down for SCSI Domain = 3.
Mar 7 17:55:42 files kernel[0]: FusionMPT: Notification = 8 (Loop State Change) for SCSI Domain = 3
Mar 7 17:55:42 files kernel[0]: FusionFC: Loop Initialization Packet for SCSI Domain = 3.
Mar 7 17:55:42 files kernel[0]: FusionMPT: Notification = 9 (Logout) for SCSI Domain = 3
Mar 7 17:55:42 files kernel[0]: FusionMPT: Notification = 7 (Link Status Change) for SCSI Domain = 3
Mar 7 17:55:42 files kernel[0]: FusionFC: Link is active for SCSI Domain = 3.
Mar 7 17:55:42 files kernel[0]: FusionMPT: Notification = 6 (Rescan) for SCSI Domain = 3
Mar 7 17:55:42 files kernel[0]: disk4s3: I/O error.
Mar 7 17:55:42 files kernel[0]: FusionMPT: Notification = 5 (External Bus Reset) for SCSI Domain = 3
Mar 7 17:55:42 files kernel[0]: FusionMPT: External Bus Reset for SCSI Domain = 3
Mar 7 17:55:42 files kernel[0]: FusionMPT: Notification = 7 (Link Status Change) for SCSI Domain = 3
Mar 7 17:55:42 files kernel[0]: FusionFC: Link is down for SCSI Domain = 3.
Mar 7 17:55:50 files kernel[0]: s3: I/O error.
=======
Then followed by a ton of various I/O errors
=======
Mar 7 17:56:42 files kernel[0]: disk4s3: I/O error.
Mar 7 17:56:42 files kernel[0]: disk4s3: I/O error.
Mar 7 17:56:42 files kernel[0]: disk4s3: I/O error.
Mar 7 17:56:42 files kernel[0]: FusionMPT: Notification = 6 (Rescan) for SCSI Domain = 3
Mar 7 17:56:42 files kernel[0]: disk4s3: I/O error.
Mar 7 17:56:42 files kernel[0]: disk4s3: I/O error.
=======
Finally by media not present errors which end the log
=======
Mar 7 17:56:42 files kernel[0]: disk4s3: media is not present.
Mar 7 17:56:42 files kernel[0]: disk4s3: media is not present.
Mar 7 17:56:42 files kernel[0]: disk4s3: media is not present.
Mar 7 17:56:42 files kernel[0]: disk4s3: media is not present.
Mar 7 17:56:42 files kernel[0]: disk4s3: media is not present.
Mar 7 17:56:42 files kernel[0]: disk4s3: media is not present.
Mar 7 17:56:42 files kernel[0]: disk4s3: media is not present.
Mar 7 17:56:42 files kernel[0]: disk4s3: media is not present.
Mar 7 17:56:42 files kernel[0]: disk4s3: media is not present.
Mar 7 17:56:42 files kernel[0]: disk5s3: media is not present.
Mar 7 17:56:42 files kernel[0]: jnl: dojnlio: strategy err 0x6
Mar 7 17:56:42 files kernel[0]: jnl: end_transaction: only wrote 0 of 8192 bytes to the journal!
Mar 7 17:56:42 files kernel[0]: jnl: close: journal 0x4c21bb4, is invalid. aborting outstanding transactions
Mar 7 17:56:42 files kernel[0]: disk4s3: media is not present.
Mar 7 17:56:42 files kernel[0]: disk4s3: media is not present.
Mar 7 17:56:42 files kernel[0]: disk4s3: media is not present.
Mar 7 17:56:45 files kernel[0]: jnl: close: journal 0x4c21c98, is invalid. aborting outstanding transactions
And that folks is it.. I'm up for any and all suggestions, questions, comments etc.. I'm absolutely desperate here!
Please, please does anyone have any ideas what's going on here.
Thanks,
James Nierodzik

Hi Roger, thanks for the reply.
Throughout the battles I did try cables that were not in the scenario to no avail so I don't think it's a cablling issue though I suppose it still could be.
Well into the backup was last night's failure point.. days previous, when through the switch, it had failed at periodic points throughout the day. I could not tie those periods to greater than normal I/O demand though.
As for cooling the components are kept in a well circulated room that is kept 24x7 at 62 degrees with an alarm on the cooling unit so I am about as certain as can be that cooling is not a factor.

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    Probably the best one is "slicing." On the RAID itself, you can create a 7-disk RAID 5 set (or 6 disks and use the 7th as a hot spare -- this gives a little more safety should a drive fail) and then slice it into a number of LUNs that will be exported separately. Each will show up as a separate "chunk" of storage to your hosts.
    The alternative is to go into Disk Utility on a connected host and actually partition the storage there. You see a 1 TB volume for example, and you can just partition it into 4 or 5 volumes, no problem.
    Just so you know, the two RAID controllers on the Xserve RAID are independent. So the largest RAID set the RAID itself can do is 7 disks. If you wish to stripe all 14 into a single large volume, you must do it via disk utility.

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