Bent Terp wrote: > On 1/24/08, Karanbir Singh <mail-lists at karan.org> wrote: >> Bent Terp wrote: >>> Hi all! >>> >>> Just a word of warning: after updating a few of our x86_64 based web >>> frontend boxes to the new kernel, we began to get weird MySQL >>> timeouts. The problem went away again when we downgraded to the >>> previous kernel-2.6.18-53.1.6.el5.x86_64.rpm >>> >> A bit more info / context would be nice ! > > We upgraded our web front servers to kernel 2.6.18-53.1.6, and > suddenly sites wouldn't load. It seemed to be that the connections > from php to the backend sql servers timed out, so we immediately > downgraded back to 2.6.18-53.1.4 > > Now that we've had more time to look at the problem, it is not related > to mysql, sorry about that. Rather, it looks as if the set of nfs > patches do not agree with our EMC Cellera NAS server. Backing out that > bunch and rebuilding makes the problem go away. > > The patches that gives us problems, results in a kernel which makes > something like 2000 times more "NFS V3 LOOKUP Call" and "NFS V3 LOOKUP > Reply" than without. > > Has something changed with regard to the mount options? We use > (rw,noatime,rsize=8192,wsize=8192,hard,udp,context="system_u:object_r:httpd_sys_content_t:s0) > which has worked fine until now. I am trying to duplicate your options ... and noatime is not a valid option. Could you please double check the /etc/export options again so I can try to duplicate the issue. Using my standard /etc/exports on 2 i686 test platforms I have no problems at all. Here are the options I used on my test: (rw,insecure,sync,no_subtree_check) Thanks, Johnny Hughes -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 252 bytes Desc: OpenPGP digital signature URL: <http://lists.centos.org/pipermail/centos/attachments/20080130/e4e6cf91/attachment-0005.sig>