The limitation is not my hardware. The servers are both Dell R900 with SAS
disk arrays. Also, from a Windows virtual machine, inside the same server,
I get around 400 MB speed using FTP transfer, windows to windows. There
must be a different way to do this from Linux.The files are sparse files,
and I need to keep them that way, that's why I use rsync.

On 4/10/11 11:35 PM, "Larry Brower" <[log in to unmask]> wrote:

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>On 04/11/2011 05:59 AM, Federico Alves wrote:
>> I am using rsync to send almost 1 TB of sparse files across the LAN to
>> another identical Linux box. If I fire only 1 command, I get about 22 Mb
>> of speed, but if I fire 6 commands in parallel, from different SSH
>> connections, the speed is divided by 6: very, very slow.
>> 
>> My command is
>>  rsync -S --progress sparsefile jephe@server:newsparsefile
>> 
>> The LAN is 1GB and both machines are Scientific Linux 6.0.
>> Is there any way to do this that does not have a bottleneck?
>> Federico
>
>
>
>This could be a limitation of your disks speed in the servers and not
>rsync itself
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