"mount.nfs: an incorrect mount option was specified" (soft)

catkin · 09-18-2009, 04:58 AM

Hello

Adding NFS option "soft" in fstab results in "mount.nfs: an incorrect mount option was specified" on mount with -o remount. When "soft" is removed from fstab the same command completes silently.

Environment

ubuntu 8.04.3 host running:
- Bridging (bridge-utils 1.2-2)
- NFS server (nfs-kernel-server 1:1.1.2-2ubuntu2.2)
- VirtualBox 3.0.6 with Slackware VM NIC configured as Bridged tap1
Slackware 13 guest. If NFS client software version is required, please tell me how to find it!

Option "soft" is wanted because Slackware sometimes looses the NFS connection with the host and this hangs shutdown. Otherwise the NFS mount works fine.

man 5 nfs on Slackware shows "soft" as an option.

Here's the relevant host exports and guest fstab lines

Code:

/home 192.168.1.46(rw,no_root_squash,no_subtree_check)
192.168.1.47:/home /home/c/hh nfs    bg,rw,soft      0 0

Best

Charles

Smartpatrol · 09-19-2009, 12:27 AM

I might be mistaken but i believe its a soft mount by default.

catkin · 09-19-2009, 06:30 AM

Quote:

Originally Posted by Smartpatrol

I might be mistaken but i believe its a soft mount by default.

Thanks Smartpatrol

According to the nfs man page on Slackware 13, the default is hard:

Code:

       soft / hard    Determines  the  recovery  behavior  of the NFS client after an NFS request times out.  If
                      neither option is specified (or if the hard option is specified), NFS requests are retried
                      indefinitely.   ...