A little history, I have tested the exports file on two servers, one in
production one a test server. The two servers are modified RHEL4.2.
production - kernel-smp-2.6.9-67.EL.x86_64
nfs-utils-1.0.6-84.EL4.x86_64
nfs-utils-lib-1.0.6-8.z1.x86_64
util-linux-2.12a-16.EL4.29.x86_64
test - kernel-smp-2.6.9-67.0.4.EL.x86_64
nfs-utils-1.0.6-84.EL4.x86_64
nfs-utils-lib-1.0.6-8.z1.x86_64
util-linux-2.12a-16.EL4.29.x86_64
The test server has a slightly newer kernel. The exports file is large,
186 lines, some lines with 20+ workstation entries.
using strace -t, the two servers look at /etc/resolv.conf, do an lstat
on the exported directories, I am double checking not to see if it is
all directories or not.
On the production server, after the lstat on the directories, there is a
call to open /etc/nsswitch.conf, /etc/host.conf, /etc/hosts, and
/var/yp/binding/domainname. All of the extra time in within this piece.
On the test server, there never is a call to open nsswitch.conf,
/etc/host.conf, /etc/hosts, or/var/yp/binding/domainname.
I have the strace of the execution of exportfs if needed.
Wayne
> -----Original Message-----
> From: J. Bruce Fields [mailto:bfields@xxxxxxxxxxxx]
> Sent: Friday, May 23, 2008 10:21 AM
> To: Murata, Dennis
> Cc: linux-nfs@xxxxxxxxxxxxxxx
> Subject: Re: extremely long time for exportfs to display
>
> On Thu, May 22, 2008 at 05:41:05PM -0700, Murata, Dennis wrote:
> > Very recently we have seen a very serious slowdown with the
> exportfs
> > command on a file server. Usually the exportfs -r command or even
> > just the exportfs command to display the exported
> directories is very quick.
> > Now it can take 20 minutes to display the exported directories.
> > An strace shows a lookup at /etc/hosts, from yp, and from dns. The
> > hosts lookup in /etc/nsswitch is files nis dns, so this is as
> > expected, the time it is taking is not.
>
> Have you run strace with something like -t to work out
> exactly where the time is going?
>
> --b.
>
> > The yp slave that the server is bound to seems to be having some
> > problems, could this be the issue?
> >
> > Wayne
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