On Fri, 2004-01-23 at 18:10, Errol Casey wrote: > I've recently encountered some issues with NFS on linux servers mounting > to a Netapp F825 server. > > Linux servers running cgi based shopping cart programs seem to have really > slow response. General cgis and web requests are running reasonably well. > Only shopping carts seem to be affected by the NFS mounted i/o which seems > really werid. > > Monitoring the NFS traffic there is a large amount of getattr, setattr > traffic on the Netapp filer. > > I've not been able to find good documentation on what good tuned values > are for actimeo are on Linux NFS clients are so the clients are just using > the defaults that come with the current kernel (2.4.24) > > We have tried udp and tcp (we are using NFS v3). > > Any suggestions? Does anybody have a copy of NFS Illustrated they would be > willing to lend, I've tried to find a copy from the library (via > inter-library loan but haven't had any luck, don't have the cash handy to > go out and by a personal copy). > > Thanks.
You should go directly to the Netapp folks for some advice. I'm sure they have the specs for tuning the fastest connections to their app. In general I find that NFS v2 is much faster the v3. Which means that I use UDP. Also I like to boost the packet size and run async (don't wait for the remote verification): rsize=8192,wsize=8192,async You might be able to optimize your shopping cart app by looking at its file and disk I/O. A lot of times you can sacrifice some RAM for less disk I/O. You might even be able to run a small RAM disk to handle temp files that are being created now across the NFS link. HtH - Jon Carnes -- TriLUG mailing list : http://www.trilug.org/mailman/listinfo/trilug TriLUG Organizational FAQ : http://trilug.org/faq/ TriLUG Member Services FAQ : http://members.trilug.org/services_faq/ TriLUG PGP Keyring : http://trilug.org/~chrish/trilug.asc
