------- Additional Comments From cw@xxxxxxxx 2003-01-08 12:44 -------
Subject: Re: Filesystem corruption at boot, with data loss
On Wed, Jan 08, 2003 at 12:42:12AM -0800, bugzilla-daemon@xxxxxxxxxxx wrote:
> I don't know if HD write cache is enabled: I kept factory set up, so
> I think it's not. I will look, but I don't think it could be
> related, because with 2.4.19 kernel and XFS patch 2002-09-27 all
> works well.
*Many* IDE drives default to write-caching on. The disk may then
reorder writes potentially break journalling or worse still, have
unflushed data in the cache when it reboots...
Please check if this is the case. "hdparm -W0 /dev/sda" or whatever
should turn this off... (hdparm man pages calls this dangerous, I've
never actually had a problem myself with it).
------- Additional Comments From dgborin@xxxxxxxxx 2003-01-09 05:38 -------
I will check ASAP and I will try disabling it, but I'd like to known why this
problem appeared only with these recent patches (and frequently!) and NEVER
before: it'a about a year I use XFS with the same hard disk without a problem.
You say that write cache could cause a data reordering, but this sould happen
always. I don't agree about the flushing: the hard disk should do it if the
system shuts it down correctly; again, if it's a problem of this HD, why the
problem appears only now?
Excuse my bad English.
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