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Old 08-21-2012, 06:54 AM
Götz Reinicke
 
Default Debugging/optimizing LAN/Fileserver Performance

Hi,

I do have one fileserver, which is compared to other systems slow when
transferring file through the lan.

The test I did get a transfer speed of about 70 - 80 MB/s. I copy files
by rsync or scp from a SSD disk to the servers ISCSI Storage and I
tested to copy to a serverside RAM disk.

I copy one big file of about 2/10 GB; 2 is to the RAM disk.

The point is, the mentioned one server just get rates off 35+- MB :/ To
DAS HW Raid and RAM disk.

And I don't have any clue, why it is so slow ....

All servers and clients are connected to gbit full duplex cisco switche
ports, which are configured the same. The servers ar centos 6.3.
Filesystems ext4 with default settings.

I checked cables and logfiles but don't get any errors/warnings to.

The difference is: The concerned server has a 'small' CPU: Intel(R)
Xeon(R) CPU 3040 @ 1.86GHz Dual Core.

My question: What can affect the network speed? What parameters can I check?

Thanks for any suggestion or hints! Best Regards . Götz
--
Götz Reinicke
IT-Koordinator

Tel. +49 7141 969 82 420
Fax +49 7141 969 55 420
E-Mail goetz.reinicke@filmakademie.de

Filmakademie Baden-Württemberg GmbH
Akademiehof 10
71638 Ludwigsburg
www.filmakademie.de

Eintragung Amtsgericht Stuttgart HRB 205016

Vorsitzender des Aufsichtsrats:
Jürgen Walter MdL
Staatssekretär im Ministerium für Wissenschaft,
Forschung und Kunst Baden-Württemberg

Geschäftsführer:
Prof. Thomas Schadt

_______________________________________________
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http://lists.centos.org/mailman/listinfo/centos
 
Old 08-21-2012, 07:14 AM
Mogens Kjaer
 
Default Debugging/optimizing LAN/Fileserver Performance

On 08/21/2012 08:54 AM, Götz Reinicke wrote:
> The test I did get a transfer speed of about 70 - 80 MB/s. I copy files
> by rsync or scp from a SSD disk to the servers ISCSI Storage and I
> tested to copy to a serverside RAM disk.

What does "top" say on the server when you're copying?

Mogens

--
Mogens Kjaer, mk@lemo.dk
http://www.lemo.dk
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Old 08-21-2012, 07:30 AM
Götz Reinicke
 
Default Debugging/optimizing LAN/Fileserver Performance

Am 21.08.12 09:14, schrieb Mogens Kjaer:
> On 08/21/2012 08:54 AM, Götz Reinicke wrote:
>> The test I did get a transfer speed of about 70 - 80 MB/s. I copy files
>> by rsync or scp from a SSD disk to the servers ISCSI Storage and I
>> tested to copy to a serverside RAM disk.
>
> What does "top" say on the server when you're copying?


load average: 0.75, 0.23, 0.07

Cpu(s): 56.8%us, 12.1%sy, 0.0%ni, 19.0%id, 8.6%wa, 0.3%hi, 3.1%si,
0.0%st

564 root 20 0 98.5m 6872 2968 R 99.0 0.2 1:08.10 sshd
569 root 20 0 105m 860 360 R 35.2 0.0 0:22.33 rsync

/Götz

--
Götz Reinicke
IT-Koordinator

Tel. +49 7141 969 82 420
Fax +49 7141 969 55 420
E-Mail goetz.reinicke@filmakademie.de

Filmakademie Baden-Württemberg GmbH
Akademiehof 10
71638 Ludwigsburg
www.filmakademie.de

Eintragung Amtsgericht Stuttgart HRB 205016

Vorsitzender des Aufsichtsrats:
Jürgen Walter MdL
Staatssekretär im Ministerium für Wissenschaft,
Forschung und Kunst Baden-Württemberg

Geschäftsführer:
Prof. Thomas Schadt

_______________________________________________
CentOS mailing list
CentOS@centos.org
http://lists.centos.org/mailman/listinfo/centos
 
Old 08-21-2012, 07:37 AM
Mogens Kjaer
 
Default Debugging/optimizing LAN/Fileserver Performance

On 08/21/2012 09:30 AM, Götz Reinicke wrote:
> 564 root 20 0 98.5m 6872 2968 R 99.0 0.2 1:08.10 sshd

It looks like ssh is the rate limiting step in your rsync.

What cipher are you using for ssh?

I use

rsync --rsh='/usr/bin/ssh -c arcfour128' ...

that helps quite a bit on my hardware, your hardware might do better
with another cipher.

You should check out https://bbs.archlinux.org/viewtopic.php?id=136713
to learn more about this.

Mogens
--
Mogens Kjaer, mk@lemo.dk
http://www.lemo.dk
_______________________________________________
CentOS mailing list
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Old 08-21-2012, 07:54 AM
Götz Reinicke
 
Default Debugging/optimizing LAN/Fileserver Performance

Am 21.08.12 09:37, schrieb Mogens Kjaer:
> On 08/21/2012 09:30 AM, Götz Reinicke wrote:
>> 564 root 20 0 98.5m 6872 2968 R 99.0 0.2 1:08.10 sshd
>
> It looks like ssh is the rate limiting step in your rsync.
>
> What cipher are you using for ssh?
>
> I use
>
> rsync --rsh='/usr/bin/ssh -c arcfour128' ...
>
> that helps quite a bit on my hardware, your hardware might do better
> with another cipher.
>
> You should check out https://bbs.archlinux.org/viewtopic.php?id=136713
> to learn more about this.


Thanks, that shows a much different transfer speed

I was not thinking, that rsync also involves ssh and de/encryption speed
.. so the bottleneck looks like the cpu in my test.

Thanks a lot I learned something new to me Regards . Götz

--
Götz Reinicke
IT-Koordinator

Tel. +49 7141 969 82 420
Fax +49 7141 969 55 420
E-Mail goetz.reinicke@filmakademie.de

Filmakademie Baden-Württemberg GmbH
Akademiehof 10
71638 Ludwigsburg
www.filmakademie.de

Eintragung Amtsgericht Stuttgart HRB 205016

Vorsitzender des Aufsichtsrats:
Jürgen Walter MdL
Staatssekretär im Ministerium für Wissenschaft,
Forschung und Kunst Baden-Württemberg

Geschäftsführer:
Prof. Thomas Schadt

_______________________________________________
CentOS mailing list
CentOS@centos.org
http://lists.centos.org/mailman/listinfo/centos
 

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