Is it normal for autofs to remount a file system more than once?

Is it normal for autofs to remount a file system more than once?

[Terrence Martin]

Hi,

I am not sure if this is related to my NFS mount hanging problems, but I 
have noticed that autofs will often remount a file system multiple 
times.  Is this normal? I think I have pretty straight forward auto. 
files....

Terrence Martin
UCSD Physics

mount
automount(pid4293) on /home type autofs 
(rw,fd=5,pgrp=4293,minproto=2,maxproto=3)
192.168.20.3:/home/cdfcaf on /home/cdfcaf type nfs (rw,addr=192.168.20.3)
192.168.20.3:/home/cdfsoft on /home/cdfsoft type nfs (rw,addr=192.168.20.3)
192.168.10.5:/falcon/0/users on /home/users type nfs (rw,addr=192.168.10.5)
automount(pid12825) on /home type autofs 
(rw,fd=5,pgrp=12825,minproto=2,maxproto=3)
192.168.20.3:/home/cdfcaf on /home/cdfcaf type nfs (rw,addr=192.168.20.3)
automount(pid3625) on /home type autofs 
(rw,fd=5,pgrp=3625,minproto=2,maxproto=3)
automount(pid3656) on /netstor type autofs 
(rw,fd=5,pgrp=3656,minproto=2,maxproto=3)
automount(pid3684) on /afs type autofs 
(rw,fd=5,pgrp=3684,minproto=2,maxproto=3)
192.168.20.3:/home/cdfcaf on /home/cdfcaf type nfs (rw,addr=192.168.20.3)
192.168.20.3:/home/cdfsoft on /home/cdfsoft type nfs (rw,addr=192.168.20.3)
192.168.10.5:/falcon/0/users on /home/users type nfs (rw,addr=192.168.10.5)
frontend-3.local:/export/home/install on /home/install type nfs 
(rw,addr=192.168.21.1)
192.168.10.5:/falcon/0/afs/fnal.gov on /afs/fnal.gov type nfs 
(rw,addr=192.168.10.5)
192.168.10.5:/falcon/2 on /netstor/falcon0-2 type nfs (rw,addr=192.168.10.5)
192.168.10.5:/falcon/0/afs/cern.ch on /afs/cern.ch type nfs 
(rw,addr=192.168.10.5)

df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/hda1             14112620   3535196   9860528  27% /
/dev/hdb1             50394964   1222448  49172516   3% /state/data
/dev/hdb2            189967608 183507236   6460372  97% /state/dcache
none                   1030804         0   1030804   0% /dev/shm
192.168.20.3:/home/cdfcaf
                     101161396  34168568  66992828  34% /home/cdfcaf
192.168.20.3:/home/cdfsoft
                     101161396  34168568  66992828  34% /home/cdfsoft
192.168.10.5:/falcon/0/users
                     1463382364 618177588 845204776  43% /home/users
192.168.20.3:/home/cdfcaf
                     101161396  34168568  66992828  34% /home/cdfcaf
192.168.20.3:/home/cdfcaf
                     101161396  34168568  66992828  34% /home/cdfcaf
192.168.20.3:/home/cdfsoft
                     101161396  34168568  66992828  34% /home/cdfsoft
192.168.10.5:/falcon/0/users
                     1463382364 618177588 845204776  43% /home/users
frontend-3.local:/export/home/install
                      10080520   5781204   3787248  61% /home/install
192.168.10.5:/falcon/0/afs/fnal.gov
                     1463382364 618177588 845204776  43% /afs/fnal.gov
192.168.10.5:/falcon/2
                     1463382364 346259560 1117122804  24% /netstor/falcon0-2
192.168.10.5:/falcon/0/afs/cern.ch
                     1463382364 618177588 845204776  43% /afs/cern.ch

cat /etc/auto.master
# $411id: /etc/auto.master$
# Retrieved: 02-Sep-2004 21:42
# Master server: 192.168.21.1
# Last modified on master: 04-Aug-2004 04:04
# Encrypted file size: 490 bytes
#
# Owner: 0.0
# Name: etc.auto..master
# Mode: 0100644
/home auto.home --timeout 600
/netstor auto.net --timeout 600
/afs    auto.afs --timeout 600
/groot   auto.grid3      --timeout 600

# cat /etc/auto.net
# $411id: /etc/auto.net$
# Retrieved: 02-Sep-2004 21:42
# Master server: 192.168.21.1
# Last modified on master: 27-May-2004 07:23
# Encrypted file size: 490 bytes
#
# Owner: 0.0
# Name: etc.auto..net
# Mode: 0100644
data0   192.168.20.1:/raid0
falcon0-0    192.168.10.5:/falcon/0
falcon0-1    192.168.10.5:/falcon/1
falcon0-2    192.168.10.5:/falcon/2

Re: Is it normal for autofs to remount a file system more than once?

[Mike Waychison]

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Terrence Martin wrote:
> Hi,
>
> I am not sure if this is related to my NFS mount hanging problems, but I
> have noticed that autofs will often remount a file system multiple
> times.  Is this normal? I think I have pretty straight forward auto.
> files....
>
> Terrence Martin
> UCSD Physics
>
> mount

>
> df


Both of these tools get their mount information from /etc/mtab, a plain
text file.  This file can get out of sync for a variety of reasons
unfortunately.  Some common reasons I usually see are:

- - You may be using multiple namespaces.  [u]mount(8) doesn't know how to
handle this.
- - [u]mount(8) has trouble getting a lock on the file, so it has trouble
updating.

The only way to see an accurate picture of your mount tree is to look at
/proc/mounts.  If this file has multiple entries for your automounted
filesystem, then there indeed is a problem.

Btw, you didn't mention which kernel(+patches?) and automount version
are you using.  That would help :)

Thanks,

- --
Mike Waychison
Sun Microsystems, Inc.
1 (650) 352-5299 voice
1 (416) 202-8336 voice
http://www.sun.com

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
NOTICE:  The opinions expressed in this email are held by me,
and may not represent the views of Sun Microsystems, Inc.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Re: Is it normal for autofs to remount a file system more than once?

[Terrence Martin]

Hi,

Aparently it looks like I have a problem

cat /proc/mounts
automount(pid4347) /home autofs rw 0 0
192.168.20.3:/home/cdfcaf /home/cdfcaf nfs 
rw,v3,rsize=8192,wsize=8192,hard,udp,lock,addr=192.168.20.3 0 0
192.168.20.3:/home/cdfsoft /home/cdfsoft nfs 
rw,v3,rsize=8192,wsize=8192,hard,udp,lock,addr=192.168.20.3 0 0
192.168.10.5:/falcon/0/users /home/users nfs 
rw,v3,rsize=8192,wsize=8192,hard,udp,lock,addr=192.168.10.5 0 0
automount(pid23831) /home autofs rw 0 0
192.168.20.3:/home/cdfcaf /home/cdfcaf nfs 
rw,v3,rsize=8192,wsize=8192,hard,udp,lock,addr=192.168.20.3 0 0
192.168.20.3:/home/cdfsoft /home/cdfsoft nfs 
rw,v3,rsize=8192,wsize=8192,hard,udp,lock,addr=192.168.20.3 0 0
automount(pid18432) /home autofs rw 0 0
192.168.20.3:/home/cdfcaf /home/cdfcaf nfs 
rw,v3,rsize=8192,wsize=8192,hard,udp,lock,addr=192.168.20.3 0 0
192.168.20.3:/home/cdfsoft /home/cdfsoft nfs 
rw,v3,rsize=8192,wsize=8192,hard,udp,lock,addr=192.168.20.3 0 0
frontend-3.local:/export/home/install /home/install nfs 
rw,v3,rsize=8192,wsize=8192,hard,udp,lock,addr=frontend-3.local 0 0
automount(pid29678) /home autofs rw 0 0
192.168.10.5:/falcon/0/users /home/users nfs 
rw,v3,rsize=8192,wsize=8192,hard,udp,lock,addr=192.168.10.5 0 0
automount(pid3017) /home autofs rw 0 0
automount(pid3047) /netstor autofs rw 0 0
automount(pid3077) /afs autofs rw 0 0
automount(pid3105) /groot autofs rw 0 0
192.168.10.5:/falcon/0/users /home/users nfs 
rw,v3,rsize=8192,wsize=8192,hard,udp,lock,addr=192.168.10.5 0 0
frontend-3.local:/export/home/install /home/install nfs 
rw,v3,rsize=8192,wsize=8192,hard,udp,lock,addr=frontend-3.local 0 0
192.168.20.3:/home/cdfsoft /home/cdfsoft nfs 
rw,v3,rsize=8192,wsize=8192,hard,udp,lock,addr=192.168.20.3 0 0

Several entries occure more than once.

I am not sure what you are meaning by multiple name spaces with regards 
to autofs?

Also my kernel is a RedHat RHEL3 stock kernel.

uname -a
Linux compute-3-4.local 2.4.21-4.0.1.ELsmp #1 SMP Sat Nov 29 04:15:49 
GMT 2003 i686 i686 i386 GNU/Linux

Autofs version 3.1.7-41

Terrence

Mike Waychison wrote:

>-----BEGIN PGP SIGNED MESSAGE-----
>Hash: SHA1
>
>Terrence Martin wrote:
>  
>
>>Hi,
>>
>>I am not sure if this is related to my NFS mount hanging problems, but I
>>have noticed that autofs will often remount a file system multiple
>>times.  Is this normal? I think I have pretty straight forward auto.
>>files....
>>
>>Terrence Martin
>>UCSD Physics
>>
>>mount
>>    
>>
>
>  
>
>>df
>>    
>>
>
>
>Both of these tools get their mount information from /etc/mtab, a plain
>text file.  This file can get out of sync for a variety of reasons
>unfortunately.  Some common reasons I usually see are:
>
>- - You may be using multiple namespaces.  [u]mount(8) doesn't know how to
>handle this.
>- - [u]mount(8) has trouble getting a lock on the file, so it has trouble
>updating.
>
>The only way to see an accurate picture of your mount tree is to look at
>/proc/mounts.  If this file has multiple entries for your automounted
>filesystem, then there indeed is a problem.
>
>Btw, you didn't mention which kernel(+patches?) and automount version
>are you using.  That would help :)
>
>Thanks,
>
>- --
>Mike Waychison
>Sun Microsystems, Inc.
>1 (650) 352-5299 voice
>1 (416) 202-8336 voice
>http://www.sun.com
>
>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>NOTICE:  The opinions expressed in this email are held by me,
>and may not represent the views of Sun Microsystems, Inc.
>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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>
>  
>

Re: Is it normal for autofs to remount a file system more than once?

[Jeff Moyer]

==> Regarding Re: [autofs]	Is it normal for autofs to remount a file system more than once?; Terrence Martin <tmartin@physics.ucsd.edu> adds:

tmartin> Hi, Aparently it looks like I have a problem
[snip]
tmartin> Autofs version 3.1.7-41

RHEL 3 U3 includes autofs version 4, which addresses this problem.

-Jeff