On Wed, Sep 20, 2017 at 10:20 AM, Gandalf Corvotempesta
<gandalf.corvotempe...@gmail.com> wrote:
> 2017-09-20 17:15 GMT+02:00 Ray Frush <fr...@rams.colostate.edu>:
>> You indicate that your ZFS store does 50-70MB/s. That's pretty slow in
>> today's world. I get bothered when storage is slower than a single 10K RPM
>> drive (~100-120MB/sec). I wonder how fast metadata operations are.
>> bonnie++ benchmarks might indicate an issue here as BackupPC is metadata
>> intensive, and has to read a lot of metadata to properly place files in the
>> CPOOL. Compare those results with other storage to gauge how well your ZFS
>> is performing. I'm not a ZFS expert.
>
> Yes, is not very fast but keep in mind that i'm using SATA disks.
> But the issue is not the server performance, because all other software are
> able to backup in a very short time, with the same hardware.
Backuppc uses the disk much more intensively than other systems. For
the reasons that you want use it. And I'd guess that zfs block-level
compression activity would be fairly inefficient on partial blocks for
more or less the same reasons there is a hit with raid 5. I assume
that your attempt to use the --inplace option reflects problems you've
noticed with your other backup systems. If it works, --whole-file
might be better, given a fast LAN and slow disks. Reconstructing a
file from copied bits of the old and merging in the changes is pretty
expensive.
Also, I'm not sure anyone has experience with changing the compression
level between runs. If you've done that it might add overhead.
--
Les Mikesell
lesmikes...@gmail.com
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