On Fri, 10 Oct 2003, Lever, Charles wrote: > the problem is likely the algorithm used to allocate > ports for the RPC transport sockets. it starts at > port 800 and goes down to zero.
Don't think so. I appears that a single connection is maintained for nfs comms for both udp and tcp. However, if a rapid number of mount requests are fired then multiple portmap connections are made. They end up in a TIME_WAIT state which is probably causing the port allocation starvation. This doesn't appear to happen under Solaris. > > > -----Original Message----- > > From: Ian Kent [mailto:[EMAIL PROTECTED] > > Sent: Thursday, October 09, 2003 6:09 PM > > To: Mike Waychison > > Cc: Ogden, Aaron A.; autofs mailing list; [EMAIL PROTECTED] > > Subject: [NFS] Re: [autofs] multiple servers per automount > > > > > > On Thu, 9 Oct 2003, Mike Waychison wrote: > > > > > Ogden, Aaron A. wrote: > > > > > > >Ouch. As you may know, the limit is *much* lower in > > linux. Something > > > >that I've been struggling with recently... > > > > > > > >Under normal circumstances I would not be concerned with > > 'limitations' > > > >of a few hundred active NFS mounts, but such limitations > > certainly limit > > > >scalability for the extreme cases. > > > > > > > > > > > > > > The maximum number of plain pseudo-block device filesystems > > on a given > > > filesystem is limitted to 256. (This includes proc, autofs, nfs..). > > > > > > This is because pseudo-block filesystems all use major 0, > > and each have > > > a different minor (thus the 256 limit). > > > > > > There are however patches floating around (look at SuSe's > > kernels, I'm > > > not sure about RH) that allow n majors to be used (default 5). This > > > gives you 1280 mounts, a big step up :) > > > > > > > But as Aaron and I know things go pear shaped at just shy of > > 800 mounts > > with RedHat kernels. They have the more-unnamed patch. > > > > So this would indicate that even if there is a device system that can > > increase the number of unnamed devices that subsystems like NFS cannot > > handle this many mounts. > > > > -- > > > > ,-._|\ Ian Kent > > / \ Perth, Western Australia > > *_.--._/ E-mail: [EMAIL PROTECTED] > > v Web: http://themaw.net/ > > > > > > > > ------------------------------------------------------- > > This SF.net email is sponsored by: SF.net Giveback Program. > > SourceForge.net hosts over 70,000 Open Source Projects. > > See the people who have HELPED US provide better services: > > Click here: http://sourceforge.net/supporters.php > > _______________________________________________ > > NFS maillist - [EMAIL PROTECTED] > > https://lists.sourceforge.net/lists/listinfo/nfs > > > -- ,-._|\ Ian Kent / \ Perth, Western Australia *_.--._/ E-mail: [EMAIL PROTECTED] v Web: http://themaw.net/ _______________________________________________ autofs mailing list [EMAIL PROTECTED] http://linux.kernel.org/mailman/listinfo/autofs
