[Gluster-users] nfs bug when do dd write

shuau li lishuai_ujs at 126.com
Tue Dec 9 09:17:45 UTC 2014

hi all,

       In my environment, I meet a nfs problem.When I do dd write for a while, nfs client will report "nfs server no responding".I think this maybe a bug of nfs server, Is anybody meet similar problem?

The details of my environment and test  are as follow:

glusterfs version:
3 nodes:
  cpu with 8 core 3.20 GHz, 16 GB memory, 10000baseT/Full network card
I use two nodes create a replica volume with two bricks, another nodes act as client, client use protocol nfs3 to mount volume through the 10000baseT/Full network card, then use command "dd if=/dev/zero of=/mnt/ida/testdata bs=128k" to write data.

Generally, onlydataabout10G can be write successfully. Then client will say "nfs server ip no responding".At the same time, I use gdb to trace nfs process in nfs server, the result is that nfs server keeps staying in epoll_wait, why nfs server  can not listen requests from nfs client ?

In addition, I noticed the difference between fuse and nfs. When access through fuse, two threads will work together, one responsible for fuse-bridge, another responsible for listening socket. But in nfs, only one thread work in background, both responsible for nfs server and listening socket. Will the cause process bottleneck?

Best wishes!!

Looking forward to yourreply!
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