By the way, I've determined our removable IDE disk trays are manufactured
by SNT (http://www.snt.com.tw/metal.htm) and are part number
SNT-129. It looks like these are the same ones startech sells.
I've placed my hardware configuration here:
Out of my 4 AMD systems, my test results are now:
- 1 refuses to die
- 1 panic'ed and died, after not being able to drop to PIO. Many
fsck errors upon reboot. The console error was "ata0: resetting devices
.. ad0: DMA limited to UDMA33, non-ATA66 cable or device"
- 2 dropped to PIO after about 15 hours of tests, and ran fine
(but slowly) with PIO
As for the the 2 that dropped to PIO and worked, I rebooted and manually ran
atacontrol mode 0 UDMA33 UDMA33
and restarted the tests. No problems in 36 hours so far. My 4 Intel
systems (which only have a UDMA33 controller on the motherboard)
have also been running 48 hours no problems.
The test I run is...
... up to about "dbench 80" and then I kill and restart.
With UDMA100, "dbench 10" gave 43 MB/Sec
With UDMA33, "dbench 10" gives 37 MB/Sec
I still plan to:
- try UDMA100 with the drives directly attached (ie. no removable tray)
- maybe try a non onboard IDE controller
- shuffle the disks to see if the problems follow the disks or not
At present, I don't suspect bad media because the error message is
"WRITE command timeout tag=0 serv=0" which doesn't suggest a specific
sector/track etc, and running with UDMA33 instead of UDMA100 makes the problem
appear to vanish.
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