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

[周鹏]

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.
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