Re: [CentOS] nfs stuck, don't know what processes to kill

[Dave Burns]

Thanks. How did I miss that -l switch? Unfortunately, I went into panic
mode and just rebooted, but I'll know next time.
Dave

On Tue, Feb 2, 2016 at 9:00 AM, Phelps, Matthew 
wrote:

> Try "umount -fl"('eff el')
>
> On Tue, Feb 2, 2016 at 1:58 PM, Dave Burns  wrote:
>
> > My NFS server is up and other clients can access x. One particular client
> > can't. I tried to unmount the NFS share:
> >
> > [root@nfsclient ~]#  umount -f /disk/x
> > umount2: Device or resource busy
> > umount.nfs: /disk/x: device is busy
> > umount2: Device or resource busy
> > umount.nfs: /disk/x: device is busy
> >
> > If I use df or lsof to try to figure out what process to kill, they
> hang. I
> > am reluctant to just reboot, as many other users are getting stuff done.
> > dmesg doesn't show anything useful.
> >
> > How to get unstuck?
> >
> > thanks,
> > Dave
> > ___
> > CentOS mailing list
> > CentOS@centos.org
> > https://lists.centos.org/mailman/listinfo/centos
> >
>
>
>
> --
> Matt Phelps
> System Administrator, Computation Facility
> Harvard - Smithsonian Center for Astrophysics
> mphe...@cfa.harvard.edu, http://www.cfa.harvard.edu
> ___
> CentOS mailing list
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> https://lists.centos.org/mailman/listinfo/centos
>



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Re: [CentOS] nfs stuck, don't know what processes to kill

[Dave Burns]

On Tue, Feb 2, 2016 at 9:23 AM,  wrote:

> Dave Burns wrote:
> > My NFS server is up and other clients can access x. One particular client
> > can't. I tried to unmount the NFS share:
> >
> > [root@nfsclient ~]#  umount -f /disk/x
> > umount2: Device or resource busy
> > umount.nfs: /disk/x: device is busy
> > umount2: Device or resource busy
> > umount.nfs: /disk/x: device is busy
> >
> > If I use df or lsof to try to figure out what process to kill, they hang.
> > I
> > am reluctant to just reboot, as many other users are getting stuff done.
> > dmesg doesn't show anything useful.
> >
> > How to get unstuck?
>
> *IF* I understand what you're saying, on that one client, you're trying to
> umount the nfs share. Is that the case?
>
> IF that is the case... is autofs running? If so, service autofs stop, and
> you should be able to umount it.
>
>mark
>
> # service autofs stop results in fail. Maybe need #rm /var/run/autofs.pid?
Dave
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Re: [CentOS] nfs stuck, don't know what processes to kill

[m . roth]

Dave Burns wrote:
> On Tue, Feb 2, 2016 at 9:23 AM,  wrote:
>
>> Dave Burns wrote:
>> > My NFS server is up and other clients can access x. One particular
>> client
>> > can't. I tried to unmount the NFS share:
>> >
>> > [root@nfsclient ~]#  umount -f /disk/x
>> > umount2: Device or resource busy
>> > umount.nfs: /disk/x: device is busy
>> > umount2: Device or resource busy
>> > umount.nfs: /disk/x: device is busy
>> >
>> > If I use df or lsof to try to figure out what process to kill, they
>> > hang.I am reluctant to just reboot, as many other users are getting
>> > stuff done. dmesg doesn't show anything useful.
>> >
>> > How to get unstuck?
>>
>> *IF* I understand what you're saying, on that one client, you're trying
>> to umount the nfs share. Is that the case?
>>
>> IF that is the case... is autofs running? If so, service autofs stop,
>> and you should be able to umount it.
>>
>> # service autofs stop results in fail. Maybe need #rm
>> /var/run/autofs.pid?

Ok, ps -ef | grep auto, and see if it's running; or are you saying it
*said* shutting it down failed? Oh, and is this CentOS 6 or 6 (service, or
systemctl)?

If it's already shut off, and lsof doesn't help, does doing a df help?
Perhaps it might show someone's workspace, or home directory mounted, so
you know who to kill?

mark

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Re: [CentOS] nfs stuck, don't know what processes to kill

[Tnjulius]

umount -fl /mount/point 
And configure it after with autofs 

Sent from my iPhone

> On Feb 2, 2016, at 20:00, Phelps, Matthew  wrote:
> 
> Try "umount -fl"('eff el')
> 
>> On Tue, Feb 2, 2016 at 1:58 PM, Dave Burns  wrote:
>> 
>> My NFS server is up and other clients can access x. One particular client
>> can't. I tried to unmount the NFS share:
>> 
>> [root@nfsclient ~]#  umount -f /disk/x
>> umount2: Device or resource busy
>> umount.nfs: /disk/x: device is busy
>> umount2: Device or resource busy
>> umount.nfs: /disk/x: device is busy
>> 
>> If I use df or lsof to try to figure out what process to kill, they hang. I
>> am reluctant to just reboot, as many other users are getting stuff done.
>> dmesg doesn't show anything useful.
>> 
>> How to get unstuck?
>> 
>> thanks,
>> Dave
>> ___
>> CentOS mailing list
>> CentOS@centos.org
>> https://lists.centos.org/mailman/listinfo/centos
> 
> 
> 
> -- 
> Matt Phelps
> System Administrator, Computation Facility
> Harvard - Smithsonian Center for Astrophysics
> mphe...@cfa.harvard.edu, http://www.cfa.harvard.edu
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Re: [CentOS] nfs stuck, don't know what processes to kill

[m . roth]

Dave Burns wrote:
> My NFS server is up and other clients can access x. One particular client
> can't. I tried to unmount the NFS share:
>
> [root@nfsclient ~]#  umount -f /disk/x
> umount2: Device or resource busy
> umount.nfs: /disk/x: device is busy
> umount2: Device or resource busy
> umount.nfs: /disk/x: device is busy
>
> If I use df or lsof to try to figure out what process to kill, they hang.
> I
> am reluctant to just reboot, as many other users are getting stuff done.
> dmesg doesn't show anything useful.
>
> How to get unstuck?

*IF* I understand what you're saying, on that one client, you're trying to
umount the nfs share. Is that the case?

IF that is the case... is autofs running? If so, service autofs stop, and
you should be able to umount it.

   mark

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[CentOS] nfs stuck, don't know what processes to kill

[Dave Burns]

My NFS server is up and other clients can access x. One particular client
can't. I tried to unmount the NFS share:

[root@nfsclient ~]#  umount -f /disk/x
umount2: Device or resource busy
umount.nfs: /disk/x: device is busy
umount2: Device or resource busy
umount.nfs: /disk/x: device is busy

If I use df or lsof to try to figure out what process to kill, they hang. I
am reluctant to just reboot, as many other users are getting stuff done.
dmesg doesn't show anything useful.

How to get unstuck?

thanks,
Dave
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Re: [CentOS] nfs stuck, don't know what processes to kill

[Phelps, Matthew]

Try "umount -fl"('eff el')

On Tue, Feb 2, 2016 at 1:58 PM, Dave Burns  wrote:

> My NFS server is up and other clients can access x. One particular client
> can't. I tried to unmount the NFS share:
>
> [root@nfsclient ~]#  umount -f /disk/x
> umount2: Device or resource busy
> umount.nfs: /disk/x: device is busy
> umount2: Device or resource busy
> umount.nfs: /disk/x: device is busy
>
> If I use df or lsof to try to figure out what process to kill, they hang. I
> am reluctant to just reboot, as many other users are getting stuff done.
> dmesg doesn't show anything useful.
>
> How to get unstuck?
>
> thanks,
> Dave
> ___
> CentOS mailing list
> CentOS@centos.org
> https://lists.centos.org/mailman/listinfo/centos
>



-- 
Matt Phelps
System Administrator, Computation Facility
Harvard - Smithsonian Center for Astrophysics
mphe...@cfa.harvard.edu, http://www.cfa.harvard.edu
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