On Wed, 2009-01-07 at 10:31 -0800, Aldo Foot wrote: > 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. ---- I have switched over to mostly using automounts which connect/disconnect when needed and I have been using -rsize=8192,wsize=8192,intr as a basic setup. Obviously I could tune the rsize/wsize and perhaps figure out that a larger number would give me better performance but I found that the intr option seemed to provide the soft landing when needed. These are the users home directories and function for a number of connections/users/systems without any fuss. Craig -- fedora-list mailing list fedora-list@xxxxxxxxxx To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
