Snow Leopard 10.6.2/10.6.3 + Xserve + Time Machine = crash

We have an Xserve (Xserve 2.1) with two 1TB internal drives. Drive 1 is configured as the root drive and has users' home directories. Drive 2 is configured as a backup. Under Leopard, we used Time Machine to backup drive 1 to drive 2. All worked well under Leopard in that regard.
However, after upgrading the Xserve to Snow Leopard, in particular 10.6.2, we began seeing hard crashes/kernel panics every few days. It took awhile to track down. I ran diagnostic tests etc, but after looking at the logs, it appeared that the slapd and Time Machine were not on good terms with one another. I disabled TM, and the crashes/kernel panics stopped. I also found out that OD was somehow hosed in this process, so I rebuilt it, and all was well there too.
I just updated the Xserve with 10.6.3 and noted that one of the improvements was in slapd/TM, so with a certain amount of hope and trepidation, I deleted all the old TM backups, verified the integrity of drive 2, and re-enabled TM.
Unfortunately much the same is happening. TM backed up quite a few GB but then ended abruptly, and drive 2 was nowhere to be seen. DiskUtilities could not find the drive to mount it, nor was I able to find it with the command line utils. It was just gone. Now when this happened in 10.6.2, a simple reboot was insufficient to bring the drive back online.
So, to get the Xserve up and running ASAP, I did a full shutdown of the Xserve. After re-powering the Xserve, the drive was back and I immediately disabled TM. I decided not to wait for the eventual crash/kernel panic to see if that would happen.
Anyone have any insight as to what is happening? What can be done? No backups is not a good idea and I would prefer to use TM, since users are used to it. At this point I am stumped.

Perhaps not the answer you are looking for but...
After my boot disk crash (see the xserver discussions) I found to be the case that my TM backups and my CCC clones of my drives often missed vital files. For example I was left with many zero byte MySQL databases. Fortunately I had copies. I always have multiple backups and different methods, but it still took me days of nerding to get 'back'.
Now before I do an update I buy an external drive that the Xserve can boot, I boot from the SL CD and I make a clone of the boot drive using Disk Utility. I test the clone and make sure it can boot, and then I run the upgrade. (A suggestion from MrHoffman on these forums, well worth adopting).
I am putting off 10.6.3 until I have done this procedure.
Drives are only a hundred units of whatever currency you use. The reassurance of having something that boots and is a bit for bit copy is priceless. Some would say I still dont do enough.
I would say these issues stop Xserves being easy to deploy (without occasional long visits) in colocation......

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