[sheepdog] Using sheepfs to modify virtual machine images of window7 takes a long time

[Liu Yuan]

On Fri, Aug 23, 2013 at 05:17:21AM +0000, 周鹏 wrote:
> >On Fri, Aug 23, 2013 at 03:27:00AM +0000, ?? wrote:
> >> Hello,i test the sheepfs of sheepdog version 0.6.0_22_g8032354.
> >> I build a cluster of 4 linux machine and it works well.
> >> But i want to inject metadata to the basic image of windows7 when it is created first time.
> >> So i use the sheepfs to mount the image,here is my command:
> >> 
> >> #mount -o loop,rw,offset=105906176 /home/sheepfs/volume/win7_clone /home/win7 -t ntfs-3g
> >> 
> >> It takes about 2 minutes to finish the mount. what a long time!
> > >
> >> I think the time is mainly spented on the mount,so if i user "collie vdi write" can shorten the time.
> >> but i am not sure.
> >> Can you give me some advice to improve the performance? thanks.
> 
> >what is the command you started sheepfs and sheep?
> 
> starting sheepfs commad:
> #sheepfs /home/sheepfs -n
> 
> starting sheep commnd:
> 
> #!/bin/bash
> mountdir=/cloud
> zookeeper="192.168.10.45:2181 192.168.10.46:2181 192.168.10.41:2181 192.168.10.47:2181"
> sheep /home/gateway -p 7000 -g 64 -z 3 -D -c zookeeper:${zookeeper}
> sheep ${mountdir}/0,${mountdir}/1,${mountdir}/2,${mountdir}/3,${mountdir}/4 -i host=192.168.10.46,port=7010 -p 7020 -D -c zookeeper:${zookeeper}

I think the performance bottleneck is related to ntfs-3g kernel module. We don't
have means to improve it.

Maybe you enable object cache in the sheep daemon and ask sheepfs take advantage
of it might help improve the performance.

Thanks
Yuan