Re: spnfs write performance issue

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J. Bruce Fields 写道:
On Wed, Feb 22, 2012 at 06:16:17PM +0800, Fu Liankun wrote:
When copy a big file(about 500MB) to nfs server using pnfs, it cost
obvious longer time as compared with NFSv3 or NFSv4 protocol.

PNFS cost about 300-550s
NFSv3 cost about 49s
NFSv4 cost about 49s

My test environment as following:

MDS: 3.1.0-rc8-pnfs   ipaddr1: 192.168.0.100, ipaddr2:192.168.1.100
DS1: 3.1.0-rc8-pnfs   ipaddr1: 192.168.0.101, ipaddr2:192.168.1.101
DS2: 3.1.0-rc8-pnfs   ipaddr1: 192.168.0.102, ipaddr2:192.168.1.102
client: RHEL6.2GA(2.6.32-220.el6.i686)    ipaddr1: 192.168.0.19,

What kind of server are you using?

Sorry for late response.

Fedora14 + 3.1.0-rc8-pnfs

--b


--b.

ipaddr2:192.168.1.19

192.168.1.100 <-------- NFS4.1 connection --------->192.168.1.101
192.168.0.100 <-------- NFS4.1 connection --------->192.168.0.102
192.168.0.19  <-------- NFS4.1 connection --------->192.168.0.100

Dunring the write process, the client output the message:
FS-Cache: Loaded
FS-Cache: Netfs 'nfs' registered for caching
nfs4filelayout_init: NFSv4 File Layout Driver Registering...
nfs: server 192.168.1.101 not responding, timed out

The message "nfs: server 192.168.1.101 not responding, timed out" was
output during the COMMIT request.

Who can tell me the reason why pnfs cost so long time.



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