-- Marvin Justice Software Developer BOXX Technologies, Inc. www.boxxtech.com 512-235-6318 (V) 512-835-0434 (F)
On Sunday 30 September 2001 03:50 pm, Alan Cox wrote: > > Curious - OSB4 thinks the DMA is still running. > > OSB4 wait exit > > This is an OSB4 trap for a problem I've seen with seagate drivers on some > boxes. Under very high load with UDMA seagate drives the OSB4 returns to > us with the chip reporting DMA in progress. The next I/O after this will > cause disk corruption as it DMA's the last 4 bytes of the previous write, > then the data shifted up by 4 bytes until the end of that I/O. I need > to confirm nobody else is seeing this with other working workloads, then > I'll swap it for a panic - better to die than kill the disc contents. > > Serverworks have been looking at the problem but have yet to duplicate it. > As far as we can tell (and Red Hat have been working with a customer on > this directly) your choices are > > 1. Use multiword DMA not UDMA > 2. Use non seagate disks with that controller > > I am hopeful that serverworks will figure out what is up, but not every box > sees it - and indeed they've yet to be able to reproduce it. > > > Alan
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