Date: Thu, 1 Aug 1996 11:54:03 +0100 (BST) From: Doug Rabson <dfr@render.com> To: "Jordan K. Hubbard" <jkh@time.cdrom.com> Cc: Tony Jago <tony@fit.qut.edu.au>, freebsd-current@FreeBSD.ORG Subject: Re: NFS Diskless Dispare... Message-ID: <Pine.BSI.3.95.960801114819.14900E-100000@minnow.render.com> In-Reply-To: <7102.838894358@time.cdrom.com>
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On Thu, 1 Aug 1996, Jordan K. Hubbard wrote: > > 1. The inability to mount file systems. The clients start barfing with > > something like "RPC mount timeout". This problem goes away after a > > while as the clients retry. I think its the mountd getting too many > > requests at once. Each client mounts 9 file systems. > > I think that this is a more generic NFS bug in -current. I can > reproduce this, even causing mountd to silently exit (no core, no > syslog msg) with just one client and some fierce AMD-assisted pounding > on a 2.2-current NFS server. Debugging this will be challenging, so > all the help we can get will be useful. If you can add some extra > logging to strategic spots in your mountd, perhaps, and analyse the > data generated you might even find the fix yourself. Ouch! This would be pretty hard to reproduce here since I only have one system which runs -current and most of the time that machine is in Win95 :-(. Try compiling mountd with DEBUG_FLAGS=-g, then attaching gdb to it with 'attach pid'. If it doesn't fault, set a breakpoint in _exit. > > > 2. Files permissions are read incorrectly. Files that should be able to > > be executed are giving "permission denied" messages. Sometimes even > > the kernel can't be loaded by netboot.com but if you persist by > > typing "autoboot" it will magically start to work. Machines fail to > > boot correctly as programms called in /etc/rc don't start > > (permission denied). > > Probably more NFS bogosity. I think for diskless root filesystems, you must export the fs with -root=0, otherwise lots of stuff will break. > > > 3. Pageing in of binaries cause the system to panic. Vnode_pager does > > not seem to like it when it can't page in executables, even when the > > See #2. :-) Probably paging from a file which root can't access (see above). > > > version 2 with hard mounts. I tryed NFSv3 (both TCP and UDP) for a while > > but it was even worse. The servers have 16 nfsd's running and the > > That's not surprising. > > > clients have 4 nfsiod's. The most stable configuration I have found at > > this stage has been 2.2-960612-SNAP but I am open to suggestions. > > 2.1.5? Its NFS is still unstable, but I don't believe anywhere near > the state it's in with -current. I think some of the stability problems with NFS are due to its lack of vnode locking primitives. This might be addressed by the lite2 fs work but if not, I will try to get something in after that work is merged. -- Doug Rabson, Microsoft RenderMorphics Ltd. Mail: dfr@render.com Phone: +44 171 251 4411 FAX: +44 171 251 0939
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