Re: commands like "du", "df", and "btrfs fs sync" hang

[Kai Krakow <hurikhan77@gmail.com>]

Am Tue, 3 May 2016 08:48:14 +0200
schrieb Kai Krakow <hurikhan77@gmail.com>:

> Am Sun, 1 May 2016 20:39:31 -0400
> schrieb Nicholas D Steeves <nsteeves@gmail.com>:
> 
> > On 1 May 2016 at 03:00, Kai Krakow <hurikhan77@gmail.com> wrote:  
> > > Hello!
> > >
> > > I'm not sure what triggeres this, neither if it is btrfs specific.
> > > The filesystems have been recreated from scratch. Mainly during my
> > > rsync backup (from btrfs to btrfs), but not necessarily limited to
> > > rsync usage, my system experiences uninterruptable freezes of
> > > commands like "df", "du", "btrfs fs sync", and probably more.    
> > 
> > Out of curiosity, does this occur if you don't create or delete
> > snapshots, or if your backup script doesn't create or delete
> > snapshots?  And when it occurs, are you able to go to another
> > terminal and run a command that you don't use often, that
> > definitely had to be read from disk, but that doesn't query any
> > filesystem properties (eg: whois)?  
> 
> I only create snapshots in the destination device, not on the source.
> I could try disabling the snapshotting and see if it changes things.
> 
> It seems from my observation, that only programs querying disk free or
> disk usage status hang, especially all of the btrfs subcommands doing
> it hang, in addition to traditional programs like du and df. I think
> also "btrfs sub delete" and friends hang. So your guess may very well
> go into the right direction. Let me try. Coming back later...

With the snapshot and sync related bits disabled in my script, I no
longer experience freezing df/du/... commands.


-- 
Regards,
Kai

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