Re: Directory tree traversal problem

[Colin Percival <cperciva@tarsnap.com>]

On 07/19/16 23:40, Matthew Seaman wrote:
> Ever since I upgraded my home system to:
> 
> % freebsd-version -ku
> 11.0-BETA1
> 11.0-BETA1
> 
> my nightly tarsnap backups have been behaving oddly.  I'm seeing the
> backup process take much longer, and it is generating a lot more network
> traffic than previously.

Could you try comparing two consecutive archives?  In particular I'm
wondering if ZFS is presenting files in a different order when tarsnap
lists directories... that would be annoying and would definitely increase
the amount of traffic because it would break deduplication of tar headers.

> I'm also getting a lot of error messages like this (repeated for each of
> the ZFSes on this system.)
> 
> Jul 19 19:00:00 lucid-nonsense backupsnap-zfs.sh[41680]: Created
> snapshots zroot@20160719-1900 and children
> Jul 19 19:00:00 lucid-nonsense backupsnap-zfs.sh[41680]: Backing up /
> Jul 19 19:06:49 lucid-nonsense backupsnap-zfs.sh[41680]: tarsnap: .:
> Unable to continue traversing directory tree: Not a directory
> Jul 19 19:06:49 lucid-nonsense backupsnap-zfs.sh[41680]: Backing up /usr
> Jul 19 19:58:26 lucid-nonsense backupsnap-zfs.sh[41680]: tarsnap: .:
> Unable to continue traversing directory tree: Not a directory

That's strange.  Do you get this error when backing up an empty filesystem?

-- 
Colin Percival
Security Officer Emeritus, FreeBSD | The power to serve
Founder, Tarsnap | www.tarsnap.com | Online backups for the truly paranoid