Unreachable NFS mount causes hang for df control

vecihi

vecihi

Hello,

Platform: FreeBSD host 8.3-STABLE FreeBSD 8.3-STABLE #3: Wed Jan 23 14:54:55 EET 2013

I mounted an NFS share with 172.16.1.144:/home/share/pub on /media/nfs (nfs) The problem is if I stop the NFS service on 172.16.1.144 machine. And if I run df -kh, this command causes a hang and if I run disk usage checks every five minutes, each df call means a new hanging process.

How can I prevent this hanging problem for df checks if the NFS share is not reachable?

Kind regards
 
Why don't you unmount the filesystems before you stop the NFS server?
 
SirDice said:
Why don't you unmount the filesystems before you stop the NFS server?
Click to expand...

NFS server connectivity problem is unexpected stuiation so I can't unmount it. By using df -t nonfs -kh command didn't solve the problem.

Regards
 
There are the intr and soft options for mount_nfs(8) but:
Code: 
    Since nfsv4 performs open/lock operations that have their ordering
     strictly enforced by the server, the options intr and soft cannot be
     safely used.  hard nfsv4 mounts are strongly recommended.
 
df -t nonfs -kh command didn't solve the problem.

Code: 
python 32950 [rpccon] 7.05r 0.00u 0.00s 0% 1676k

Do you have another suggestion?
 
SirDice said:
There are the intr and soft options for mount_nfs(8) but:
Code: 
    Since nfsv4 performs open/lock operations that have their ordering
     strictly enforced by the server, the options intr and soft cannot be
     safely used.  hard nfsv4 mounts are strongly recommended.
Click to expand...

True. That's one of the drawbacks of NFSv4. But: The OP is probably not using NFSv4.

Here is my suggestion: Make sure you are using NFSv2 or NFSv3. Then, you have to make a decision whether you want your system to be able to operate when the NFS server is not available. In many situations, there is no point trying to operate without the NFS server, and waiting for it to come back up is the right answer. In that case, mount the NFS file system with option "hard". In the case of the OP, he seems to be wanting to be able to operate without the NFS server, so he should mount with option "soft".

But: If he does that, he needs to think about all the places where he uses that NFS file system, and he needs to make sure all of them do the right thing if the file system is not present.
 
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