Re: nfs unmount: can it be done from (to) a croaked system?

[Mike Riechers <mlr%rse.com@localhost>]

Thanks, all.

(see below.)

Date: Tue, 23 May: "Jonathan A. Kollasch" <jakllsch%kollasch.net@localhost>
>On Tue, May 23, 2017 at 11:15:55AM +0000, Christos Zoulas wrote:
>> In article <201705221949.56425.mlr%rse.com@localhost>,
>> Mike Riechers  <mlr%rse.com@localhost> wrote:
>> >Hello, all.
>> >
>> >A few weeks ago one of our computers bit the big one: the root disc
>> >drive croaked (bad).  One of these days I'll get to replacing the
>> >drive, but I'm not shedding too many tears, for 1)it's a little used
>> >system, and 2) the important data was on other drives.
>> >
>> >What is annoying is, however, the fact that we had files nfs mounted
>> >on our network that were serviced from this computer.  Now any time we
>> >do a "df", an unmount, or any operation that references the nfs from
>> >that computer, the program "locks up," and ps shows:
>> >
>> >             D       Marks a process in device or other short term,
>> >                     uninterruptible wait.
>> >
>> >I did a "df" on one of our computers a couple of weeks ago, and ps
>> >still shows the process in device or other short term, uninterruptible
>> >wait.  So much for short term.
>> >
>> >I believe that the df inquiry is going to wait forever, demanding to
>> >palaver with the nfs that isn't there anymore.  (It's inconvenient to
>> >try to remember to do a "df -l," and of course, there goes info
>> >concerning my other nfs mounts.)
>> >
>> >I tried a "umount -fh mydeadcomputer.com" on the nfs mount, but all
>> >that got me was a locked-up "umount."
>> >
>> >I've rebooted one computer, and of course that worked, but I'd rather
>> >not do the same thing to all the rest.  Is there a more elegant
>> >solution I'm missing?
>> >
>> >I've tried starting up another computer to imitate the failed one as
>> >to IP and interface name, but that didn't work.  It looks like the
>> >only thing that will satisfy my live computers is an actual commune
>> >with the dead nfs system (or a reboot).
>> >
>> >Any help?  Thanks in advance,
>> 
>> Umount -f is supposed to work, but it never has. Please file a PR.
>> 

Will do.

>
>It sometimes does, but you pretty much always have to use -R with dead NFS.
>
>	Jonathan Kollasch
>
>

Thanks for the clue, so I just tried that, but it didn't work, either.

Yours,

-Mike

-- 
Kind Regards, I am

 /s/ Michael L. Riechers

Michael L. Riechers,
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