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This page is intended to document what might be considered networking notes or anomalies -- things that make sense in the context of networking, but are somewhat strange or surprising. Some people might consider them unavoidable, but I'm not sure they are.

Here's the first one, just to provide a discussion point:

  • If you have a machine that is using a directory on another machine via a networking filesystem (share), and that other machine goes down, the first machine may experience problems of the nature of a total hang or a slowdown in operation, possibly depending on which filesystem is in use (Samba, NFS, other). -- Is this unavoidable? I don't think so -- it may be that there is nothing in the current design of these filesystems to deal with this, but I think something could be done -- something like a periodic ping of the share, and then an automatic umount of that share if not found. Or combined with a periodic retry after umounting. Part of the key would be a defined ping or retry -- don't continuously ping, but do something like try three times, and if not successful, wait x minutes before trying again. Combined with something so that, if a user tries to access that share while it is umounted, it tries again immediately, but only three times, then gives the user a message like "<resource> unavailable, try again later" (or "the computer will retry in <n> minutes and advise you if successful", or ??). I guess the toughest case might be if the access is from a script or program -- not sure of the best course -- maybe the program should fail to potentially be restarted later?? -- requires more thought.

See also this thread: Re: [expert] Unmountable Samba mounts and other oddities; 29 Jul 2002 -- search at http://www.mail-archive.com/expert@linux-mandrake.com/

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  • () RandyKramer - 30 Jul 2002
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Topic revision: r2 - 2002-07-30 - RandyKramer
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