[lkml]   [2003]   [Nov]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: ide write cache issue? [Re: Something corrupts raid5 disks slightly during reboot]
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.

-- v --
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:58    [W:0.103 / U:26.380 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site