Shell Programming and Scripting

Hi gurus,

OS = SunOS 5.8

Not sure whether to post this in the scripting one or to advance and experts. Am posting on both since there is two things that am wanting to achieve.

Am currerntly having NFS server errors where it is having problems NFS mounting some of the volumes from the same NFS NAS server. Unfortunately, our UNIX SAs is the least helpful of the type of SAs that you can ever have all he can say is no problem that he/she can see.

I don't know which ones are having the NFS problems. so I decided I want to write a script to check which ones are having NFS mount problems but my script stalls whenever it reaches one that is having NFS problem and hence I cannot check the rest of the mount point.

To illustrate what am wanting to do, for example, the /etc/mnttab file have the following mount entries:

Code:

/etc/mnttab example:

/nas_mnt/u01
/nas_mnt/u02
 /nas_mnt/u03
 /nas_mnt/u04
 /nas_mnt/u05

I want to have a script that does ...

while read mnt
do
   df -k #{mnt}
done < /etc/mnttab

So what am wanting to achieve is giving df maybe only 10 seconds and if it does not response due to the NFS error, then terminate and process the next one in the list.

Would be best of course if someone know of a command besides df that I can use to check for NFS-filesystem mounts that are having problems.

Am thinking can I put the df into a script that creates/removes a lock file and run that script in the background then let the script sleep 10, then after 10 seconds, if the lock file still exists, it does a kill -9 of the script that is running in the background.

This is what I have in mind. Will it work?

Code:

 /etc/mnttab example:
 
 /nas_mnt/u01
 /nas_mnt/u02
  /nas_mnt/u03
  /nas_mnt/u04
  /nas_mnt/u05
 
df.sh:
df_processid=$$
echo "${df_processid}" > df.lock
df -k ${1}
remove df.lock


 while read mnt
 do
    df.sh ${mnt} &
   sleep 10
  -- check for df.lock, if it exists, then kill -9 for df_processid
  -- otherwise do nothing
done < /etc/mnttab

Any response / feedback will be much appreciated. Thanks in advance.

What we use to do is , to redirect the stdout of df to a file, check for content change(i.e. number of lines) frequently sar every 10 secs, if that doesn't change the content of the file,then kill the last df command and go for next.

I think this is simple to implement and serves the purpose.