Evren Yurtesen wrote:
> # Type #Files Size/MB MB/sec #Files Size/MB #Files Size/MB
> 245 full 152228 2095.2 0.06 152177 2076.9 108 18.3
> On Linux with raid setup with async io etc. people are getting slightly
> better results. I think ufs2 is just fine. I wonder if there is
> something in my explanations...The problem is backuppc. People are
> getting ~2mbytes/sec(was it 2 or 5?) speed with raid5 and 5 drives,
> using Linux. It is a miracle that backup even finishes in 24 hours using
> a standart ide drive.
2MB/sec isn't bad when handling a lot of files (try unpacking a tar with
hundreds of thousands of little files to see). The problem is that
you are getting .06 on a drive that is capable of running a couple of
sessions at 1.5MB/sec or so. I'd try to get up to normal speed before
claiming that the software needs to be fixed to get more. More RAM will
probably make a huge difference, but first are you sure that your IDE
controller and cable are a match for the drive and that your OS is using
an efficient DMA mode? I've seen even some of the 80-pin cables have a
problem that would make things shift down to 33Mhz pio mode which will
kill you. Does freebsd log the IDE mode detected and have some way to
test throughput?
>> BTW, how does BackupPC calculate speed? I think it calculates backup
>> speed by reporting files transferred over time, so if you don't have
>> many files that change, won't BackupPC report a very low backup speed.
>
> This is like the 'Contact' movie. The sphere took 30 seconds to download
> but there were 18 hours of recording. If what you said was true and
> backuppc would be backing up very small amount of files and skipping
> most, then backups would probably take less time than 2-4 hours each.
If you look at the 'duration' in the backup summary and the Size/MB in
the lower File Size summary you can compute your own rate based on what
you are backing up. For fulls at least this seems to be based on the
real target size, not what rsync had to transfer.
--
Les Mikesell
[EMAIL PROTECTED]
-------------------------------------------------------------------------
Take Surveys. Earn Cash. Influence the Future of IT
Join SourceForge.net's Techsay panel and you'll get the chance to share your
opinions on IT & business topics through brief surveys-and earn cash
http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
_______________________________________________
BackupPC-users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/backuppc-users
http://backuppc.sourceforge.net/
