Hi all,
i've experiencing a problem difficult to solve about NFS performance.
I have a web server cluster (running on RHEL4) where all servers mount a
nfs file server (NetApp F270):
[EMAIL PROTECTED] ~]# cat /proc/mounts | grep nfs
fil01:/vol/vol1/web /www nfs
rw,v3,rsize=8192,wsize=8192,hard,intr,tcp,nolock,proto=tcp,timeo=4,retrans=5,addr=fil01
0 0
Mounting the file server on a new machine where is running a fresh
install of RHEL5 (don't care about sizes, i have tried all combination
possible)
[EMAIL PROTECTED] ~]# cat /proc/mounts | grep nfs
fil01:/vol/vol1/web /www nfs
rw,vers=3,rsize=32768,wsize=32768,hard,intr,nolock,proto=tcp,timeo=4,retrans=5,sec=sys,addr=fil01
0 0
shows a performance problem: the CPU load and ops/s on the NetApp
increase dramatically, and reading becomes slow
nfsstat command shows an interesting fact: a very high number of lookups
Client nfs v3:
null getattr setattr lookup access
0 0% 10366 0% 2 0% 975623 90% 63084
at the moment I have some "nested mounting" (a second file server
mounted on a directory in the filesystem of the main one) and i'm moving
them in a non "nested" way.
Is this a possibile cause of the problem? What other can i try?
Thank you in advance
--
Alessandro Tinivelli
[EMAIL PROTECTED]
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