Re: df hangs -- nfs related problem

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Wed, Jan 7, 2009 at 7:16 AM, Patrick O'Callaghan
<pocallaghan@xxxxxxxxx> wrote:
> On Wed, Jan 7, 2009 at 9:33 PM, Rick Stevens <ricks@xxxxxxxx> wrote:
>>
>> Try "lsof | grep nfs" to see if anything has the mountpoint open.  If
>> not, try "umount -f /mnt/nfs" as the root user to try a forced umount.
>>
>> Also check to see if the mount command (or /etc/fstab entry) has "hard"
>> specified (that's the default as well).  Unless you're really certain
>> about the stability of the network and of the NFS server, I'd recommend
>> you specify "soft" in the mount command (see "man 5 nfs" for details).
>
> That would depend on which is worse, potentially losing data or having
> a client machine hang because the server is (perhaps temporarily)
> unavailable. It depends totally on the specific application scenario.
> To quote nfs(5):
>
> <quote>
> A  so-called  "soft"  timeout can cause silent data corruption in
> certain cases. As such, use the soft option only when client
> responsiveness is more important than data integrity.  Using NFS over
> TCP or increasing the value of the retrans option  may  mitigate some
> of the risks of using the soft option.
> </quote>
>
> IOW there is no "right" answer to this.
>
> poc

The command "umount -f" fixed my problem. Thanks Rick.
I had tried "umount -k", which works in older RedHat8
boxes; clearly I've got to re-read the man pages now and then.

So, it appears a soft mount may be ok for read-only operations but not
ideal for things such as remote X-applicatons or filesystems
such as /home or /var/mail. It's wise to make the distinction between hard
and soft mount --great pointer.

~af

-- 
fedora-list mailing list
fedora-list@xxxxxxxxxx
To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list
Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
[Index of Archives]     [Older Fedora Users]     [Fedora Announce]     [Fedora Package Announce]     [EPEL Announce]     [Fedora Magazine]     [Fedora News]     [Fedora Summer Coding]     [Fedora Laptop]     [Fedora Cloud]     [Fedora Advisory Board]     [Fedora Education]     [Fedora Security]     [Fedora Scitech]     [Fedora Robotics]     [Fedora Maintainers]     [Fedora Infrastructure]     [Fedora Websites]     [Anaconda Devel]     [Fedora Devel Java]     [Fedora Legacy]     [Fedora Desktop]     [Fedora Fonts]     [ATA RAID]     [Fedora Marketing]     [Fedora Management Tools]     [Fedora Mentors]     [SSH]     [Fedora Package Review]     [Fedora R Devel]     [Fedora PHP Devel]     [Kickstart]     [Fedora Music]     [Fedora Packaging]     [Centos]     [Fedora SELinux]     [Fedora Legal]     [Fedora Kernel]     [Fedora OCaml]     [Coolkey]     [Virtualization Tools]     [ET Management Tools]     [Yum Users]     [Tux]     [Yosemite News]     [Gnome Users]     [KDE Users]     [Fedora Art]     [Fedora Docs]     [Asterisk PBX]     [Fedora Sparc]     [Fedora Universal Network Connector]     [Libvirt Users]     [Fedora ARM]

  Powered by Linux