Messages in this thread | | | Date | Sat, 1 Nov 2003 23:02:23 +0200 | From | Ville Herva <> | Subject | Re: ide write cache issue? [Re: Something corrupts raid5 disks slightly during reboot] |
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On Sat, Nov 01, 2003 at 08:01:14PM +0100, you [Willy Tarreau] wrote: > On Sat, Nov 01, 2003 at 08:25:18PM +0200, Ville Herva wrote: > > > Is there anything special in booting to DOS instead of different linux > > kernel, other than that it would rule out some strange kernel bug that is > > present in 2.2 and 2.4? > > No, it was just to quicky confirm or deny the fact that it's the kernel > which causes the problem. It could have been a long standing bug in the IDE > or partition code, and which is present in several kernels.
I vaguely recall some ide write cache flushing code was fixed some time ago, but I can't find it in the archives. Maybe I dreamed that up. But I still wonder why an otherwise idle drive would hold the data in write cache for so long (several minutes.)
> But as you say that it affects two different controllers, there's little > chance that it's caused by anything except linux itself.
Unless the drive is buggy wrt. flushing its write cache. But I think it's a quite distant possibility.
> Then, the reboot on DOS will only tell you if the drives were corrupted at > startup or at shutdown.
Yep. I'll try to find the moment to boot the beast into something else than the current kernel / distro (it could in theory be something in userspace, though I cannot think what).
> > BTW: the corruption happens on warm reboots (running reboot command), not > > just on power off / on. > > OK, but the BIOS scans your disks even during warm reboots.
True, I mainly made this note because I hadn't mentioned it before in the thread, and I thought it might have some relevance wrt. possible ide write caching problems. I didn't mean it as a response to the BIOS theory.
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