df -h hangs

[Mukeshkumar]

In my RHEL server I have mounted cifs file system. When I gave dF -h it hangs an no any output of command How I can remount all those cifs file system without rebooting server.

[ricardodacosta]

To remount without rebooting you could use:

mount -o remount /mountpoint

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[Scott]

I would expect that your df -H hanging is a symptom of issues with your cifs device or configuration.  As the df marches through the mounted filesystems, it gets to that one and is unable to get a response, hence why it is hanging.  It is unusual that you would need to remount it unless you're doing something like suspending a laptop and changing it's networks where the cifs mounts was initially connected (original network) but now is not (new network).

-STM

[NitinInd]

Hi ,

I have same kind of problem in my envoirnment . So in case if mount -o remount does not work does not work .

Try # umount -lf  /mountpoint 

Please check firewall rules on samba server allow access to remote machine . Sometime because of slow reponse from sambe  or nfs share ,df -h output hangs becasue check connectiviy between share drive .

Also in case you want to df -h command to check other partition size , Use

#df -h /mountpoint 

Till share drive issue solve .

[mbrito · Accepted solution]

Hi,

#strace /bin/df   #and verify were it hangs
# umount -l /pathToMount

[penguins]

This worked like a charm, Thank You 

[billski226]

strace command is very very useful to find the errent mount!! Then simpley umount 

-l /pathToMount, as shown above, WORKS EXCELENT & SIMPLE.

[Kailas4035]

I unmounted my nfs share using umount command. But it is not mounting back using mount -a command. Please help.

[Chetan_Tiwary_]

@Kailas4035 try mounting with -v and see what it is showing. Check in the logs for any error / info.

Are there other clients as well - were the issue is found in any of those clients as well ? If yes then it is a NFS server side issue. Check for service and logs in the server.

If other clients are working fine then check the affected client side - network issue can be affecting. You can use the tcpdump script here to capture the packets and analyse the network issue : https://access.redhat.com/articles/4330981#intermittent

[Chetan_Tiwary_]

Hi @Mukeshkumar ,

Thanks for reaching out !

You should first try to find out the reason for the hung df -h command using strace command : strace /bin/df -h or strace mount -t cifs //<cifsserverIP>/share  /mnt 

There can be multiple reasons for the hung df -h like :

1. May be CIFS server is not responding.

2. May be there is a problem with the network connection between the RHEL server and the CIFS server.

3. Finally, it is also possible that there is a problem with the CIFS file system itself.

Once you found out the reason for hung df -h , then use lazy unmount :

umount -l <mountpath>

then, mount the file system using mount -a. This should resolve your issue. 

Here are some additional tips for troubleshooting if df -h hangs for a CIFS mount:

• Check CIFS server's logs for any errors.
• Check server's logs for any errors.
• Try mounting the CIFS file system from a different server.