Operating System - OpenVMS
cancel
Showing results for 
Search instead for 
Did you mean: 

Will network cluster interconnect work without decnet?

 
SOLVED
Go to solution
Clark Powell
Frequent Advisor

Will network cluster interconnect work without decnet?

I am trying to run a two node cluster with an interconnect that consists of a nic on each node connected with a tp crossover cable so that the two nics may communicate. I have not configured DECNET on these ports. I think one of the nics or the cable is bad because I can't get the second node to boot (even though it does join the cluster if I have my normal network connections from each node to our lan.) But, just to be safe I would like to ask if two nics can be the cluster interconnect even if decnet is not configured on these nics? I'm using OpenVMS 8.3

thanks
Clark Powell
5 REPLIES
Robert Gezelter
Honored Contributor
Solution

Re: Will network cluster interconnect work without decnet?

Clark,

As far as I can remember, the requirement for DECnet was removed a while ago.

I presume that the systems involved have TCP/IP configured. May I suggest that a good test would be to use an otherwise unused RFC 1918 block of addresses as a "within the cluster" subnet. Assigning these addresses to the dedicated cluster connect would allow the use of PING to verify correct functioning (when not testing, these lines could be disabled within TCP/IP).

- Bob Gezelter, http://www.rlgsc.com
Andy Bustamante
Honored Contributor

Re: Will network cluster interconnect work without decnet?

>>>an interconnect that consists of a nic on each node connected with a tp crossover cable
This is valid. By default, OpenVMS will attempt to use all NICs available for cluster traffic. The protocol for cluster traffic is SCS, which is does not require DECnet.

>>>I can't get the second node to boot (even though it does join the cluster if I have my normal network connections from each node to our lan.

If you're using a cross over cable, are both NICs configured for the same speed/duplex or auto settings?

Is this shared storage with a quorum disk? Have you confirmed the cable is a cross over cable? Are you attempting to network boot?

Andy Bustamante
If you don't have time to do it right, when will you have time to do it over? Reach me at first_name + "." + last_name at sysmanager net
Clark Powell
Frequent Advisor

Re: Will network cluster interconnect work without decnet?

It was a bad cable. Works now.
Thanks all
Clark Powell
Clark Powell
Frequent Advisor

Re: Will network cluster interconnect work without decnet?

Cluster communication and MSCP disk serving are funtioning now. The cable was bad.
Hoff
Honored Contributor

Re: Will network cluster interconnect work without decnet?

DECnet and SCS clustering are not particularly related.

Or more specifically, they're about as related as IP is related to clustering.

Prior to OpenVMS V6.2, it was expected that you'd have and want and use DECnet for various management tasks, but it was entirely feasible to operate and manage a cluster without DECnet around even then. (A few areas that might be useful, such as MONITOR CLUSTER, did need DECnet prior to V6.2.)

The core confusion here tends to be the use of DECnet MOP to operate satellite bootstraps. The same thing happened with MOP and DECserver downloads. if you needed MOP for various cluster or DECserver tasks, then you did (prior to V6.2) need to have DECnet around. With V6.2, LANCP became available, and MOP was this available outside of DECnet.