On Fri, Apr 15, 2016 at 05:42:21PM +0200, Niccolò Belli wrote: > Hi, > Is it 100% safe to run a btrfs check without --repair? > Because otherwise I will have to wait for my new external drive to > arrive and make a backup first.
Yes, it's safe, unless there's some underlying hardware problem that would cause the hardware to break even more by exercising it. For added peace of mind, use --readonly, which does nothing itself, but conflicts with all of the options that might change things. Hugo. > Thanks, > Niccolò > > On venerdì 15 aprile 2016 11:30:32 CEST, Qu Wenruo wrote: > >Would you please run "btrfs check --readonly <your dm0>" and paste > >the output? > > > >The dmesg seems very impossible: > > > >>BTRFS error (device dm-0): bad tree block start 245497856 245498111 > > > >The later one is not even aligned to 2. > > > >But you system still seems mountable as you succeeded in running > >btrfs scrub. > > > >So I assume either the tree block is not a critical one or the > >copy saved you. > > > >Thanks, > >Qu -- Hugo Mills | What part of "gestalt" don't you understand? hugo@... carfax.org.uk | http://carfax.org.uk/ | PGP: E2AB1DE4 |
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