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Re: hardware or software bug?

Stephen C. Tweedie wrote:

On Tue, Apr 16, 2002 at 09:34:45AM -0700, Amit D Chaudhary wrote:

Matt Bernstein wrote:
> At 14:20 +0100 Stephen C. Tweedie wrote:
>>More seriously, since 2.4.11, there's a page-cache/buffer-cache
>>aliasing problem which can lead to this being hit in ext3 if you
>>merely read from the buffered block device on which the fs sits. This
>>can happen, for example, if you dump(8) a live filesystem. I've got a
>>fix pending for the ext3 side of that problem, and have posted the
>>core VFS fix to l-k.
> *blush* We dump our filesystems live. I bet we're not the only ones.
Short of lvm, is there any other way to backup a ext3 live filesystem, that is say one mounted as /, /usr, etc and have it as a clean(empty journal) backup copy?

rsync, tar etc. will all do backups well.  rsync in particular is
pretty smart about doing copies between full filesystems.
Thanks for reply.

I assume this will go through the vfs cache filling it up for a one time operation. Is there any way of avoiding that, something like a raw i/o mechanism.


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