[sheepdog-users] cache performance test

[Valerio Pachera]

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