Raid performance deteriorates, looses drive, but no messages in event log

We have a PATA XServer Raid running, which was fine until a few weeks ago. Suddenly performance tanked, writing a 70 MB file via a 100 Mbps network would take an hour.
The Raid volume, a 6 drive 250 GB raid with one hotspare, had 100 GB left.
First we thought it was the network, there was a loose DHCP server, but nothing was available that could really explain the performance deterioration. The only thing that was noticed was that with Helios Lan test the first write to the raid would take more time as the subsequent writes. So we decided to upgrade the firmware and do a volume test, with diskutility. That gave a interleaf problem.
After upgrading the network (which was planned anyway) to 1 GBps, we rebooted the Xserve and the Raid. Now, the 6th drive had an orange status in Raid Admin, a warning, saying it was part of an Unknown Array. The 7th drive, the hot-swap, was now part of the Raid.
The strange thing is that in the event log there are no messages what so ever about a failed drive, nor any other messages relating to this. All I get is Coprocessor offline/Online, Raid Controller Restarted and Riad Controller 1 Fibre LIP, and Firmwareupdate
I also noticed that the time was off to local time, so I synchronized both to time.euro.apple.com.
Shouldn't we be getting messages something is very wrong in the event log?
XServe G5 Xserve Raid Mac OS X (10.3.9)

We updated the firmware to 1.5.1. After that, the network switch was replaced by a 1Gbps switch, and the XServe and the XServe raid were rebooted. After that one of the people discovered that disk 6 had an orange led burning.
XServe G5, XServe Raid Mac OS X Server (10.3.9) Raid Firmware 1.5.1

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Raid performance deteriorates, looses drive, but no messages in event log

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