On Thu, Jan 24, 2019 at 01:00:15AM -0500, Chris Laprise wrote:
> On 01/23/2019 08:15 PM, [email protected] wrote:
> > Mike Keehan:
> > > Hi,
> > > 
> > > I'm using Qubes Backup to save some of my qubes into another VM.
> > > The backup VM has 18 Gb of storage available, but whenever the
> > > backup file reaches 3Gb, the backup process just hangs.
> > > 
> > > No CPU usage, no error messages, just stops.  The backup window
> > > shows 40% complete, but never moves any further (different % for
> > > different combinations of qubes in the backup list).
> > > 
> > > After waiting a considerable time (well, 5-10 minutes), hitting
> > > Cancel in the backup window does cancel it.  The rest of the
> > > system is continuing to work without problem.  Happens every
> > > time I try to use Qubes backup.
> > > 
> > > The Qubes Disk Space widget shows less than 50% disk used overall,
> > > the backupVM shows only 18% disk used when the 3Gb file has been
> > > saved.
> > > 
> > > I'm stumped.
> > > 
> > > Mike.
> > 
> > Hi,
> > 
> > You may have to wait longer than 5-10 minutes. I experience something
> > similar when doing a full backup, except it's worse because i'm backing
> > up like 2.5TB. It appears to hang for several hours at a time (and this
> > happens more than once), but it does eventually make visible progress
> > again. The whole process takes over 24 hours. This is why i do full
> > backups very infrequently.
> > 
> > For you it shouldn't take nearly as long because it's a lot less data,
> > but the progress appearing to hang for a while seems to be normal.
> > 
> > I'm using 3.2 tho, and i know they made changes to the backup mechanism
> > under the hood in 4.0, so i'm not sure if this issue still applies in
> > 4.0.
> 
> Marek,
> 
> Isn't this the null bytes bug in GNU tar?
> 
> https://groups.google.com/d/msgid/qubes-users/f4d997d5-7191-06d0-e7bb-ef42745a7db5%40posteo.net
> 
> It would be a good idea to update this in dom0. My own backup tool uses GNU
> tar as well.
> 
> -- 
> 
> Chris Laprise, [email protected]
> https://github.com/tasket
> https://twitter.com/ttaskett
> PGP: BEE2 20C5 356E 764A 73EB  4AB3 1DC4 D106 F07F 1886

It seems a little early to judge.

Mike - it looks from your comment as if you have been trying with
subsets of the qubes? Can you confirm if these are running or stopped.

Like jsnow, I'm regularly able to backup far more than 3G without issue,
so it looks as if there's something particular about this scenario.
It would be helpful if you could confirm the issue when all qubes you
are backing up are stopped.
Then try bisecting the qubes backup group - keep bisecting if you hit
the problem again until you either find the problematic qubes or have
backed them all up.

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