On Saturday 17 May 2014 04:02:35 William Kenworthy wrote:
> On 17/05/14 08:08, William Kenworthy wrote:
> > On 17/05/14 04:15, Marc Joliet wrote:
> >> So, a week has passed since my conversion to btrfs.
> >
> >...
> >
> >> Have a nice weekend,
> > 
> > Don't forget to have a maintenance program - run a scrub regularly once
> > a week or so - I have enough btrfs drives (22 qemu files, 4 WD Greens
> > att) to see about one or two scrub fixable errors a week with no obvious
> > cause, sometimes serious (in a critical file).  My experience is that if
> > you ignore these errors they seem to increase over time resulting in a
> > crash and burn.  Keep an eye on your logs as btrfs will list the errors
> > there as well ("grep -i btrfs /var/log/messages").  For the ones scrub
> > cant fix, delete the file and restore from backup.  Errors that require
> > off-line fixing (btrfsck) are the ones where I have lost file systems -
> > though I have not seen this in the last 6 months.
> > 
> > I am quite practised in restoring from backups because of btrfs :)
> > 
> > BillK
> 
> This is from this mornings grep of the log:
> May 15 07:00:34 myth kernel: btrfs: checksum error at logical 1775247360
> on dev /dev/vda3, sector 5580816, root 5, inode 6423718, offset 1839104,
> length 4096, links 1 (path:
> var/log/mythtv/old/mythbackend.20140421061150.6275.log-20140515)
> May 15 07:00:34 myth kernel: btrfs: bdev /dev/vda3 errs: wr 0, rd 0,
> flush 0, corrupt 1, gen 0
> May 15 07:00:34 myth kernel: btrfs: unable to fixup (regular) error at
> logical 1775247360 on dev /dev/vda3
> May 15 07:41:40 myth kernel: btrfs: bdev /dev/vda3 errs: wr 0, rd 0,
> flush 0, corrupt 1, gen 0
> 
> and
> 
> May 16 20:40:33 moriah kernel: btrfs: bdev /dev/mapper/vg1-backups errs:
> wr 0, rd 250, flush 0, corrupt 13, gen 0

Thank you all for sharing your experiences with btrfs.  It looks like it will 
be come the fs of choice in the future.

I am not clear on one thing:  is the corruption that you show above *because* 
of btrfs, or it would occur silently with any other fs, like e.g. ext4?

-- 
Regards,
Mick