automount slow

Posted on 2002-07-30
Last Modified: 2013-12-16

I'm using 3 Redhat6.0 boxes, which have been running happily for a couple of years.  One box is an NIS server, and all three machines cross-mount drives via NFS using an automounter.  However, in the last couple of days the automount performance has degraded.  Sometimes automounting is very slow (10 to 20 seconds), and occasionally it times out and fails.  Once automounting has taken place disk performance is normal.

The /etc/auto.master file from one of the machines is:

# $Id: auto.master,v 1.2 1997/10/06 21:52:03 hpa Exp $
# Sample auto.master file
# Format of this file:
# mountpoint map options
# For details of the format look at autofs(8).
#/misc     /etc/auto.misc     --timeout 60
/import /etc/auto.misc  --timeout 60

and the /etc/auto.misc file is:
 $Id: auto.misc,v 1.2 1997/10/06 21:52:04 hpa Exp $
auton_data    -rw,rsize=8192,wsize=8192 auton:/auton_data
auton_user    -rw,rsize=8192,wsize=8192 auton:/auton_user

lydat_data    -rw,rsize=8192,wsize=8192 lydat:/lydat_data
lydat_user    -rw,rsize=8192,wsize=8192 lydat:/lydat_user

Neither of these files have been altered in the last few days.  ping is not detecting any network problems or lost packets.  Any clues??

Many thanks
Question by:doyston
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LVL 51

Expert Comment

ID: 7189013
are all machines using the same version of mount and nfsd?

Author Comment

ID: 7189960
Yes, same version on all machines.  Below is the output from nfsstat for one of the machines.  I am not familiar with interpreting nfsstat output, but there are errors in several fields, especially client/server nfs lookup.

Server rpc stats:
calls      badcalls   badauth    badclnt    xdrcall
1664974    0          0          0          0      
Server nfs v2:
null       getattr    setattr    root       lookup     readlink  
0       0% 26104   1% 19596   1% 0       0% 296352 17% 89419   5%
read       wrcache    write      create     remove     rename    
64183   3% 0       0% 927165 55% 69706   4% 26987   1% 61947   3%
link       symlink    mkdir      rmdir      readdir    fsstat    
43      0% 1       0% 146     0% 145     0% 2799    0% 80381   4%

Client rpc stats:
calls      retrans    authrefrsh
1664974    0          0      
Client nfs v2:
null       getattr    setattr    root       lookup     readlink  
0       0% 66      0% 2440    6% 0       0% 29125  73% 0       0%
read       wrcache    write      create     remove     rename    
3126    7% 0       0% 4882   12% 2       0% 1       0% 0       0%
link       symlink    mkdir      rmdir      readdir    fsstat    
0       0% 0       0% 0       0% 0       0% 41      0% 1       0%
LVL 51

Accepted Solution

ahoffmann earned 100 total points
ID: 7190034
looks reasonable
I've seen following reasons to make automount behave strange:
  1. problem with NIC, can you check with ifconfig if there are errore or dropped values
  2. cross-mounts *and* a NFS server goes down (then I needed to restart all linux nfs clients: mountd, nfsd)
     do you get "NFS server not responding" somewhere?

Author Comment

ID: 7192760
There are a couple of errors picked up on two of the machines with ifconfig, though no dropped values, so I'll investigate the network.
LVL 51

Expert Comment

ID: 7194495
let me know if the NICs caused  the problem, I need to update my problem counter then ;-)

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