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

[dan <dan...@gm...>]

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 <mco...@us...>wrote:

> So you doubled your performance by adding another 4gb of memory?
>
> -----Original Message-----
> From: Tino Schwarze [mailto:bac...@ti...]
> Sent: Wednesday, September 24, 2008 11:20 AM
> To: bac...@li...
> 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."
>
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