[sheepdog-users] cluster snapshot save and load speed

[Valerio Pachera]

2014/1/21 Liu Yuan <namei.unix at gmail.com>

> How did you start sheep? is '--nosync' sepcified? If not, the low speed is
> imposed by slow 'sync' request handling of disk.
>

Yes, I forgot to mention it
sheep -n /var/sheep /mnt/sheep/dsk02 -c zookeeper:192.168.2.44:2181,
192.168.2.45:2181,192.168.2.46:2181 -i host=192.168.10.4 port=3333 -w
size=200000G dir=/mnt/sheep/dsk01


> Loading of snapshot might be slower because it is more disk intensive (it
> need
> generate and store parities for EC or extra copies for replciation).
>

Does a write request of a guest differ from a snapshot load?
I know they both generate the same result: n copies or parities.
I don't know if they do it the same way.
BTW, as shown in another mail, snapshot load uses the default -c 3.
I still think 6M/s is slow. I get not less than 30M/s writing from a guest
with -c 3.


> By the way, I've updated devel branch with 'dog vdi list' show patch.
>

I'll test it asap.
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