Real Server Monitoring

Malcolm Cowe malcolm_cowe at
Tue Aug 7 13:46:45 BST 2001

HP's MC/ServiceGuard cluster software monitors NFS using the "rpcinfo" 
command -- it can be quite sensitive to network congestion, but it is 
probably the best tool for monitoring this kind of service.

The problem with listing an NFS exported directory is that when the 
service bombs, ls will wait for quite a while -- you don't want the 
director hanging because of an NFS query that's gone awry. =)


P.S. I've now established a modest service for XDM login access via the 
cluster (currently LVS w/ NAT, using HP-UX real-servers). Thanks for all 
your help. Works well -- all I need now are some startup scripts, the 
real-server monitoring and director fail-over! It's a small list.

Joseph Mack wrote:
> Horms wrote:
>>On Sat, Aug 04, 2001 at 01:06:49AM -0000, Don Hinshaw wrote:
>>>Would a simple TCP_CONNECT be the right way to test NFS?
>>If you are running NFS over TCP/IP then perhaps, but in my experience NFS
>>deployments typically use NFS over UDP/IP. I'm suspecting a better test
>>would be to issue some rpc calls to the NFS server and look at the
>>response, if any. Something equivalent to what showmount can do might not
>>be a bad start.
> how about exporting the directory to the director as well and doing an `ls`
> every so often
> Joe

Malcolm Cowe.
IT | Information Technology,    eMail: malcolm_cowe at
Agilent Technologies Ltd.       External: +44 131 331 6466
South Queensferry, EH30 9TG.    Telnet: 313-3466

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