RAID Goes Read-Only (-50 Error)

I have a first-revision xserve raid, connected via a Vixel 335 to 4 servers, zoned so there are two on each RAID controller, with LUN masking allowing one volume to appear on each server.
One pair of servers tends to break each other whenever something happens. I restart one server and the other one stops being able to write to the xserve raid. Any write attempt results in a -50 error. Then if I restart the one that went bad, it breaks the other the same way. If I restart them at the same time, it usually works, but sometimes does not, sometimes the volumes won't even mount. RAID admin loggs a "Fiber LIP" when either server restarts. That seems normal, but it why does the RAID stop allowing writes on the other volume? Anyone seen anything like this before?
This pair of servers are second-revision G4 xserves with the pre-installed FC cards.
Thanks for any input.
Mark Mayfield
Roseville Area Schools
Network Manager

I did a little more research and there are quite a few people who've seen this error.  I don't think it's the drive. 
I suspect the controller in the enclosure, a jmicron 0x2336, is responsible for my problems.  It looks like Linux and FreeBSD both had software updates to work around bugs in the controller.  If OS X did not get updated, it would explain everything. The drive sleeps and then won't wake up fully and OS X marks it as in error and goes read only. 
The enclosure is a Thermaltake Silver II USB + esata.  It looks like a lot of people have had similar problems with them.  I saw posts on macrumors, adobe's support forums, etc.

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    "Mcygee" <[email protected]> schrieb im Newsbeitrag
    news:[email protected]..
    >
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    >
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    >
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    >
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    >
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    >
    >
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