Jeremy Mann wrote:
>
>> What operations are you watching to see these numbers? The only one
>> where network bandwidth matters much is the initial copy of a new host.
>> The rest of the time you are mostly doing comparisions. Backuppc
>> will be slower than native rsync because it is in perl and because it is
>> working with a compressed copy for the comparison. And perhaps you
>> didn't use the --ignore-times option on the runs you are using for
>> comparison. Backuppc does this on fulls and it will slow things down to
>> the speed that the remote can read the whole disk for the checksum
>> comparisons - but it gives you an integrity check on your pooled copy.
>
> I'm watching a live output of Ganglia showing network usage while the
> backups are going. Also simple math.. I just finished one full backup, 16
> GB in 143 minutes. That's simply unacceptable for a full backup.
You still haven't said whether this is the first run where the files are
actually copied or not - if not you shouldn't expect much network
activity. How long would it take the target to read all it's files?
Something like 'time tar -cf - / | cat >/dev/null' would be a reasonable
test. (Don't do -cf /dev/null with gnutar because it will cheat and not
read the files.) That would be the fastest an rsync run could possibly
complete with the --ignore times option even if you don't transfer any
data or create new files on the server.
> Now if you tell me my hardware isn't fast enough, the BackupPC server is a
> dual Opteron 2.2 Ghz with 8 GB RAM and 24 300GB drives in a 3ware RAID5
> array, it isn't.
Either end can limit the speed. How many concurrent runs do you do?
Also, you should expect much faster rates if you have a few large files
than if you have millions of tiny ones.
--
Les Mikesell
[email protected]
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