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Help with NFS shares

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Operating Systems Linux Red Hat Help with NFS shares
# 1  
Old 12-04-2013
Help with NFS shares
Hi,

I have got nfs shares that were shared from storage (Netapp) to linux servers (RHEL 4) that were on automount.

All the share were visible and mounted on the linux serves eventhough they were on auto mount.

But recently one of the server was rebooted and mount points were disappeard and i can see from fstab file that has been edited as well. so i have keept it back similar to other servers where it works.

Some mount points are missing . They are not shown in df output or under mount point but seems to be present logically.

As i know the location when i cd into that directory the mount point reappears and disappears again when i come out of the directory.

when i try to manually mount it, i get a message saying that it is already mount and it is busy.

Other servers doesnt face this problem even after reboot. All th auto mount points are always visible on them.

Even though these are on auto mount is there any option that made them always visible. If so could any one provide the info?

Thanks,
P
Last edited by Scott; 12-04-2013 at 09:56 AM.. Reason: Removed formatting
# 2  
Old 12-04-2013
Can you paste the share configuration (/etc/exports ?) from the server and the mount definitions on the clients (/etc/fstab or any scripts that run to mount them manually)

It would be useful to see if any of the directories are under a filesystem that has not mounted for another reason. Do you have old versions of /etc/fstab available?



Please paste your output in CODE tags.



Robin
Last edited by rbatte1; 12-04-2013 at 07:34 AM.. Reason: Please paste your output in CODE tags.
# 3  
Old 12-04-2013
If you can cd into the folder and df -h . shows that it is NFS, there is nothing strange or missing.

Automount will umount the NFS share if it is not used for configured time of seconds (check man automount).

It will also mount the NFS if an application / user wants to access the specified mountpoint.

What is strange here if you are using automount, you should not use /etc/fstab entries or mount it by hand !
# 4  
Old 12-04-2013
Quote:
Originally Posted by Peasant
If you can cd into the folder and df -h . shows that it is NFS, there is nothing strange or missing.

Automount will umount the NFS share if it is not used for configured time of seconds (check man automount).

It will also mount the NFS if an application / user wants to access the specified mountpoint.

What is strange here if you are using automount, you should not use /etc/fstab entries or mount it by hand !
Hi,
Thanks for reply and that is what it bothers me as well. You don't need to have auto mount when you are going to mount it permanently. Since it was configure long time ago by someone who left the company and no one has bothered to ask about it.

I also understand how auto mount works and from configuration i can see that it gets unmounted after 600 sec as specified.

Informed my supervisor and he told me that there was one option that made them always visible which i am not aware of.

Any idea what that option could be ?

Thanks,
P

---------- Post updated at 01:51 PM ---------- Previous update was at 01:46 PM ----------

Quote:
Originally Posted by rbatte1
Can you paste the share configuration (/etc/exports ?) from the server and the mount definitions on the clients (/etc/fstab or any scripts that run to mount them manually)

It would be useful to see if any of the directories are under a filesystem that has not mounted for another reason. Do you have old versions of /etc/fstab available?



Please paste your output in CODE tags.



Robin
Hi Robin,

Thanks for reply. These mount points were working fine until system got rebooted and we dont have a proper reason on first place why it was rebooted. After rebooting only this issue was occurred.

Mount points are logically present but not able to view them when df is used. when tried to manually mount them it says it is already mounted and and busy.

I dont have any older versions of fstab as well.

Here i am looking to find if there is any option that i am not aware of that made them always visible on the client.

Any info would be great.

Thanks,
P
# 5  
Old 12-04-2013
To make permanent mounts, I put the entries in /etc/fstab and ignore the auto-mount daemon completely.

I was concerned that if you have a mount point /a/b/c/d and when the server is booting, /a/b fails to mount, then the mount point will not be there. It could also be that the mount sequence is incorrect, so it tries to mount /a/b/c/d first and fails then mounts /a/b and you are left wondering why.


As I requested before, can you paste /etc/fstab into the thread?


Regards,
Robin
# 6  
Old 12-06-2013
Quote:
Originally Posted by rbatte1
To make permanent mounts, I put the entries in /etc/fstab and ignore the auto-mount daemon completely.

I was concerned that if you have a mount point /a/b/c/d and when the server is booting, /a/b fails to mount, then the mount point will not be there. It could also be that the mount sequence is incorrect, so it tries to mount /a/b/c/d first and fails then mounts /a/b and you are left wondering why.


As I requested before, can you paste /etc/fstab into the thread?


Regards,
Robin
Hi Robin,

Sorry for delay in posting the output. I was off and below is the output of /etc/fstab

Code:
[root@node1 ~]#cat /etc/fstab

# This file is edited by fstab-sync - see 'man fstab-sync' for details

/dev/sda2                 /                       ext3    defaults        1 1
/dev/sda1             /boot                   ext3    defaults        1 2
none                    /dev/pts                devpts  gid=5,mode=620  0 0
none                    /dev/shm                tmpfs   defaults        0 0
none                    /proc                   proc    defaults        0 0
none                    /sys                    sysfs   defaults        0 0
/dev/sda3         swap                    swap    defaults        0 0
/dev/sda5          /scratch                ext3    defaults        1 2

/dev/hda                /media/cdrecorder       auto    pamconsole,exec,noauto,managed 0 0



#filer01b
filer01b:/vol/am1  /data/am1  nfs     defaults,nfsvers=3        1       2
filer01b:/vol/pro1 /data/pro1 nfs     defaults,nfsvers=3        1       2
filer01b:/vol/pro2 /data/pro2 nfs     defaults,nfsvers=3        1       2
filer01b:/vol/amscratch /data/amscratch nfs     defaults,nfsvers=3        1       2
filer01b:/vol/am3 /data/am3 nfs     defaults,nfsvers=3        1       2

When the reboot took place i believe some thing has written or changed the fstab file and in turn filer01b mount points were missing inside fstab. I have manually edited the fstab file after the reboot.

Thanks,
P
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