Re: [MooseFS-Users] speed drop

[Piotr R. K. <pio...@ge...>]

> To make sure you are getting the full gigabit bandwith on your servers, also use a tool to measure the connectivity between them, perhaps a tool like iperf can help.

The simplest you can run is dd + netcat:

First machine - listener:
nc -v -l 2222 > /dev/null

Second machine - sender:
dd if=/dev/zero bs=1M count=1024 | nc -v IP_OF_FIRST_MACHINE 2222



or iperf as Diego suggested:

Listener:
iperf -s

Sender:
iperf -c LISTENER_IP -t 30



Best regards,
Peter

Piotr Robert Konopelko | m: +48 601 476 440 | e: pio...@mo...
Business & Technical Support Manager
MooseFS Client Support Team

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> On 9 Aug 2018, at 2:10 PM, Remolina, Diego J <dij...@ae...> wrote:
> 
> When you say 100Mbps, do you mean megabits per second or megabytes per second?  100Mbps is much different to 100MB/s
> 
> At Gigabit interconnect, your network limitation will be ~112MB/s (megabytes per second) read/writes which is the maximum bandwidth of your gigabit network cards.
> 
> Have you tried mounting the file system itself on one of the servers? This should rule out network. If the reads/writes are slow there, then it may help you isolate the issue to the backend storage.
> 
> To make sure you are getting the full gigabit bandwith on your servers, also use a tool to measure the connectivity between them, perhaps a tool like iperf can help.
> 
> HTH,
> 
> Diego
> From: Roman <int...@gm...>
> Sent: Thursday, August 9, 2018 7:39:23 AM
> To: moo...@li...
> Subject: [MooseFS-Users] speed drop
>  
> Hello!
> 
> I have problems with the drop in the speed of reading and writing.
> I have a 1 Gbit network. Initially, the write and read speed in the 
> Moosefs cluster was ~100Mbps (3 copies of the data). At the moment it is 
> about 10Mbps.
> There are no problems with the network. Switches and network cards work 
> as it should.
> 
> Where to dig?
> 
> 
> Thanks,
> Roman
> 
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