Re: [BackupPC-users] JFYI: memory upgrade brought major speedup

not too suprising if using rsync. rsync will use about 100Bytes per file for the file list, and then about that much again during the transfer of files and checksum. I would guess that you are over 1GB of ram just for that.

Additionally, having more ram will allow linux to do a lot more caching which frees up I/O for backuppc.

as far as the RAID5 is concerned, do you have specific performance issues? since this is a Dell im assuming that you are using a PERC controller? In the case of a PERC controller in a modern poweredge the RAID5 write parity penalty is not too much of a factor as the controller has an offloading engine for parity processing. Most RAID5 performance issues are cause by a software raid5, fakeraid(software masquerading as hardware) or hardware without a dedicated chip for parity calculations.

On Wed, Sep 24, 2008 at 10:55 AM, Michael Cockrell <mcockrell AT usnx DOT net> wrote:

So you doubled your performance by adding another 4gb of memory?

-----Original Message-----
From: Tino Schwarze [mailto:backuppc.lists AT tisc DOT de]
Sent: Wednesday, September 24, 2008 11:20 AM
To: backuppc-users AT lists.sourceforge DOT net
Subject: [BackupPC-users] JFYI: memory upgrade brought major speedup

Hi there,

I'd just like to share my experience with a hardware upgrade. I've got a
Dell PowerEdge 2900 here with a Quad Core Xeon E5310 @1.6GHz, 2 GB memory
and hardware RAID5 (questionable decision, but that's another story). I
was pretty unhappy with the overall performance of the system for some
time.

The server is backing up 23 servers, the largest task being 120 GB in
about 2 million files, followed by three servers with 30-40 GB in about
200,000 files.

It managed to back up about half of these servers during a night -
during the day it's preparing tar.bz2 for tape archiving via bacula.
Overall, the machine was rather I/O bound doing heavy I/O all the time
with a lot of waiting time.

Because we upgraded another internal server (memory's rather cheap
currently), we added another 4 GB to the server and now it manages to
handle almost all server backups during a night. :-)

So I'm rather satisfied again and will postpone the RAID5->RAID10
conversion for some time. :-)

Bye,

Tino.

--
"What we nourish flourishes." - "Was wir nähren erblüht."

www.craniosacralzentrum.de
www.forteego.de

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