[sheepdog-users] cache performance test

Liu Yuan namei.unix at gmail.com
Thu Jul 18 09:54:01 CEST 2013


On Thu, Jul 18, 2013 at 09:15:29AM +0200, Valerio Pachera wrote:
> 2013/7/18 Liu Yuan <namei.unix at gmail.com>:
> > was this on guest?
> 
> yes
> 
> > My SSD is Sandisk(128G) and less powerful than your 840 pro. So I think you
> > should get higher throughput.
> 
> root at test004:/mnt/sheep/meta# dd if=/dev/zero of=c1 bs=1M count=512 oflag=direct
> 536870912 byte (537 MB) copiati, 2,48295 s, 216 MB/s
> 
> My are mounted in a HP mini server. It's not a good performing
> computer so I don't use all the ssd power.
> Anyway, host writes faster than 200M/s.
> 
> > I think you can try 'sheep -w directio,
> 
>   sheep -w size=20000 directio /mnt/sheep/meta/ /mnt/sheep/dsk02
> 
> root at backup:/mnt/backup# dd if=/dev/zero of=c7 bs=1M count=512 oflag=direct
> 536870912 byte (537 MB) copiati, 7,99709 s, 67,1 MB/s
> root at backup:/mnt/backup# dd if=/dev/zero of=c8 bs=1M count=512 oflag=direct
> 536870912 byte (537 MB) copiati, 7,96561 s, 67,4 MB/s

Still a bit slow. Did you try qemu -drive if=virtio for guest?

Thanks
Yuan



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