On 01/31/2012 09:42 AM, gene heskett wrote: > On Tuesday, January 31, 2012 09:37:52 AM Mark Wendt did opine: > > >> On 01/31/2012 09:02 AM, gene heskett wrote: >> >>>> NFS can use up all the CPU cycles trying to get a remount. I've seen >>>> that quite a few times, especially at boot time, when a system is >>>> trying to do an NFS mount on another system that's down at the time, >>>> and it just sits there forever until the other machine comes back >>>> up. The soft and retrans option allows the boot to continue after >>>> so many attempts, and then you can fix the problem once it's fully >>>> booted. >>>> >>>> Mark >>>> >>> But, this is _after_ the other machine had been rebooted for 15-20 >>> minutes when this one locked up, hence my tendency to think it wasn't >>> related to any traffic thru NFS at the time. I had just logged back >>> in over ssh, done a cd to a subdir and an ls. The next operation and >>> I forget now what it was, was over that ssh link, might have been an >>> ls -l, completed ok, but then the keyboard and mouse were gone, I >>> looked over at the gkrellm strip, it was frozen, I then reached and >>> found the reset button. Had it been synchronous to the shop machines >>> reboot, that would have been another critter entirely to this, IMO. >>> >>> Cheers, Gene >>> >> That's what is normally called a stale file handle. The "soft" >> attribute will help with that also. For whatever reason, when the >> server side was rebooted, the client did not cleanly dismount, or never >> dismounted the NFS mount. It's still trying to give you information >> from the last mount, which doesn't exist anymore, and it keeps trying to >> process the NFS commands. If you had done a manual "umount" then a >> manual "mount" of the NFS partition before trying to access it with the >> "ls" command it probably would have been okay. This is also where the >> automount facility can come in real handy too. Automount automagically >> umounts an NFS partition after a certain period of time of non-use. The >> NFS partition will then be automounted the next time you access it. >> Check out autofs. There are a lot of configuration settings that will >> make NFS mounts virtually painless. >> >> Mark >> > > autofs is running on both boxes. No clue what the dismount timeout is but > I would have thought it would have expired. I use it for copying stuff > back and forth, but anything else is done over an ssh -Y link, which should > not involve NFS. > > Cheers, Gene > That's really odd. Which machine is the one that's locking up, the Ubuntu or the pclos?
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