[Gluster-users] gluster client performance

[Pavan T C]

> But that still does not explain why you should get as low as 50 MB/s for
> a single stream single client write when the backend can support direct
> IO throughput of more than 700 MB/s.
>
> On the server, can you collect:
>
> # iostat -xcdh 2 > iostat.log.brickXX
>
> for the duration of the dd command ?
>
> and
>
> # strace -f -o stracelog.server -tt -T -e trace=write,writev -p
> <glusterfsd.pid>
> (again for the duration of the dd command)

Hi John,

A small change in the request. I hope you have not already spent time on 
this. The strace command should be:

strace -f -o stracelog.server -tt -T -e trace=pwrite -p
<glusterfsd.pid>

Thanks,
Pavan

>
> With the above, I want to measure the delay between the writes coming in
> from the client. iostat will describe the IO scenario on the server.
> Once the exercise is done, please attach the iostat.log.brickXX and
> stracelog.server.