Re: [BackupPC-users] backuppc slow rsync speeds

Subject:

From:

Timothy J Massey <tmassey AT obscorp DOT com>

To:

"General list for user discussion, questions and support" <backuppc-users AT lists.sourceforge DOT net>

Date:

Mon, 17 Sep 2012 12:58:28 -0400

Les Mikesell <lesmikesell AT gmail DOT com> wrote on 09/17/2012 11:01:25 AM: > On Mon, Sep 17, 2012 at 7:59 AM, Mark Coetser <mark AT tux-edo.co DOT za> wrote: > > > Surely disk io would affect normal rsync as well? Normal rsync and even > > nfs get normal transfer speeds its only rsync within backuppc that is slow. > > > > Backuppc uses its own rsync implementation in perl on the server side > so it will probably not match the native version's speed.

Sadly, I think this is where the problem lies.

> Is this the > first or 2nd full run? On the first it will have to compress and > create the pool hash file links.

But doesn't this get done at the link stage, not the backup stage? I didn't think that the "link running" part even got counted in the backup time...

In my case, this is well after the first (or first 100) backups...

> On the 2nd it will read/uncompress > everything for block-checksum verification. If you have enabled > checksum caching, fulls after the 2nd will not have to read/uncompress > unchanged files on the server side.
I'm going to have to test this... but I really don't like the fact that with checksum caching a file corrupted on the backup server will remain undetected--until the user tells me so when I restore it... :(

Timothy J. Massey


Out of the Box Solutions, Inc. Creative IT Solutions Made Simple! http://www.OutOfTheBoxSolutions.com tmassey AT obscorp DOT com		22108 Harper Ave. St. Clair Shores, MI 48080 Office: (800)750-4OBS (4627) Cell: (586)945-8796

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