[ale] Nfs mounts are EXTREMELY slow

[Bob Toxen]

I suggest verifying that each client can to Reverse DNS host resolution
on the server and vice versa.  Many times NFS is used in a private
network (IP Masqueraded/NAT'ed) where there proper DNS records are
missing.

Regarding another poster's comment,  generally portmap is necessary
for NFS.

Bob

On Fri, Aug 03, 2007 at 01:10:34PM -0400, Jim Lynch wrote:
> Bob Toxen wrote:
> >Verify that there isn't a DNS problem causing either the client or the
> >server to wait for DNS to timeout before proceeding.
> >
> >Btw, this also is a common cause for email connections to one's server
> >taking almost exactly 1 minute or 5 minutes to happen.
> >
> >Bob Toxen
> >bob at verysecurelinux.com               [Please use for email to me]
> >http://www.verysecurelinux.com        [Network&Linux/Unix security 
> >consulting]
> >http://www.realworldlinuxsecurity.com [My book:"Real World Linux Security 
> >2/e"]
> >Quality Linux & UNIX security and SysAdmin & software consulting since 
> >1990.
> >Quality spam and virus filters.
> >
> >"Microsoft: Unsafe at any clock speed!"
> >   -- Bob Toxen 10/03/2002
> >
> >On Fri, Aug 03, 2007 at 07:18:48AM -0400, Jim Lynch wrote:
> >  
> >>Well, that may be a stretch, but a minute and 45 seconds is a long time, 
> >>IMHO.  It's the same from two different systems. 
> >>
> >>The /etc/exports file:
> >>/data1/mail/db     192.168.2.50(rw,sync) 192.168.2.44(rw,sync)
> >>
> >>The fstab on the system trying to mount:
> >>
> >>192.168.2.90:/data1/mail/db    /var/lib/omega/data   nfs    
> >>rsize=8192,wsize=8192,timeo=14,intr,noauto
> >>
> >>Output of 'time mount /var/lib/omega/data'
> >>
> >>real    1m45.887s
> >>user    0m0.000s
> >>sys     0m0.022s
> >>
> >>Am I doing something wrong?   I don't see anything funny in any log. 
> >>
> >>Jim.
> >>
> >>_______________________________________________
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> >>http://www.ale.org/mailman/listinfo/ale
> >>    
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> >http://www.ale.org/mailman/listinfo/ale
> >
> >  
> 
> Nothing else wrt networking seems slow.  The resolv.conf is pointing to 
> my westell modem and that just bounces to bellsouth's servers.  I can 
> ping, ssh, wget pretty much whatever I want from all the systems without 
> delay.  Is there something specific I could look for?
> 
> Jim.