You talk about one dle or multiple dle?
Are you using compression or encryption? on client or server?
Are you using holding disk? or dumping directly to tape?
Post the amdump.<n> file for when it use NFS and when it doesn't use it.

Jean-Louis

Alan Griffiths wrote:

amgtar with blocksize set to 512 performs at the same speed.

If I mount the partition on the backup server via NFS then the backup runs 
about 6x quicker. So I'm assuming it must be something related to way AMANDA 
sets up up the TCP connection. Although obviously open to other suggestions.

Alan


----------------------------------------

Date: Wed, 21 Oct 2009 06:59:01 -0400
From: martineau AT zmanda DOT com
To: ap_griffiths AT hotmail DOT com
CC: dustin AT zmanda DOT com; amanda-users AT amanda DOT org
Subject: Re: TCP Tuning

Use the amgtar application and set the TAR-BLOCKSIZE to a bigger value
(half the STREAM_BUFSIZE.

Why do you believe it is bottleneck?

Jean-Louis

Alan Griffiths wrote:

Thanks for the pointer.

I've re-compiled with

define STREAM_BUFSIZE (NETWORK_BLOCK_BYTES * 16)

And I can see that has taken effect on the server

dumper: try_socksize: send buffer size is 524288

But backups are running no faster and I cannot see any indication on
the client of the buffer size being used. Note: client also has the
new binaries. In older versions of AMANDA amandad used to report
buffer size, but this appears to not be the case in 2.6.1p1.

Thanks,

Alan

Date: Mon, 19 Oct 2009 10:03:21 -0400
Subject: Re: TCP Tuning
From: dustin AT zmanda DOT com
To: ap_griffiths AT hotmail DOT com
CC: amanda-users AT amanda DOT org

On Mon, Oct 19, 2009 at 5:33 AM, Alan Griffiths
 wrote:

Is there a way to modify the size of the TCP buffers used by

AMANDA? I am

trying to improve performance over a relatively high latency link

and this

seems to be the only way.

It's a source constant, unfortunately, set in stream.h (STREAM_BUFSIZE).

A patch to make that configurable at compile time or, better, at
runtime would be much appreciated!

Dustin

--
Open Source Storage Engineer
http://www.zmanda.com

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