Could be related to some of the nfs bugs that have been noted already with rhel5. make sure your kernel is 2.6.18-53.1.4
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Alessandro Tinivelli Sent: Tuesday, January 29, 2008 11:09 AM To: [email protected] Subject: [rhelv5-list] Problem with NFS on new rhel5 kernels 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,retra ns=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,ret rans=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] _______________________________________________ rhelv5-list mailing list [email protected] https://www.redhat.com/mailman/listinfo/rhelv5-list _______________________________________________ rhelv5-list mailing list [email protected] https://www.redhat.com/mailman/listinfo/rhelv5-list
