Just one dle.
No compression - data is already compressed (gzip).
No encryption.
I am using holding disk.

Attached files: -

amdump.1 direct from client
amdump.3 through NFS.

----------------------------------------
> Date: Thu, 22 Oct 2009 11:58:57 -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
>
> 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. 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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