On Fri, Oct 17, 2014 at 10:10:09AM +0200, Tomasz Torcz wrote: > On Fri, Oct 17, 2014 at 04:02:03PM +0800, Liu Bo wrote: > > > Recently I've observed some corruptions to systemd's journal > > > files which are somewhat puzzling. This is especially worrying > > > as this is btrfs raid1 setup and I expected auto-healing. > > > > > > System details: 3.17.0-301.fc21.x86_64 > > > btrfs: raid1 over 2x dm-crypted 6TB HDDs. > > > mount opts: rw,relatime,seclabel,compress=lzo,space_cache > > > Reads with cat, hexdump fails with: > > > read(4, 0x1001000, 65536) = -1 EIO (Input/output error) > > > > > Does scrub work for you? > > As there seem to be no way to scrub individual files, I've started > scrub of full volume. It will take some hours to finish. > > Meanwhile, could you satisfy my curiosity what would scrub do that > wouldn't be done by just reading the whole file?
It checks both copies. Reading the file will only read one of the copies of any given block (so if that's good and the other copy is bad, it won't fix anything). Hugo. -- === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk === PGP key: 65E74AC0 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk --- The future isn't what it used to be. ---
signature.asc
Description: Digital signature
