topic Re: Heartbeat messages in Operating System - HP-UX

Heartbeat messages

a8965 — Wed, 14 May 2003 06:55:25 GMT

Hi,

I'm configuring several Heartbeat pathes (one dedicated with small hub and one through the network) in order to prevent from SPOF.

NODE_NAME ftsys9
NETWORK_INTERFACE lan0
HEARTBEAT_IP 15.13.171.32
NETWORK_INTERFACE lan3
HEARTBEAT_IP 192.6.7.3

But I wonder if HB messages are sent to both ways simultaneously (lan0 and lan3) or if one way (f.e. dedicated one - lan0) is primary and the other one (lan3) secondary ??

Are Heartbeat messages working in active/standby mode ??

Re: Heartbeat messages

Dietmar Konermann — Wed, 14 May 2003 07:20:13 GMT

The HB messages are sent in parallel using all configured HB networks. Of course, the cluster is happy to get messages through at least one of the paths.

Best regards...
Dietmar.

Re: Heartbeat messages

Christos Magdalinos — Thu, 15 May 2003 08:11:16 GMT

Hi Dietmar

is right ... I hope you are
not under the impression that
lan3 can be used as a standy
for lan0 in the configuration
you sent ...
The main data standby lan has
to be unconfigured in order to be used by MCSG.

Regards

Christos

Re: Heartbeat messages

Michael Steele_2 — Thu, 15 May 2003 10:50:19 GMT

Very good question. To the best of my knowledge MC/SG has always just provided one primary heartbeat for signaling. Use 'cmverify -v' or 'cmscancl -o file' for this.

Having two LANs designated as heartbeat LANs within the cluster.ascii file is an indication that they qualified during the creation of the cluster binary. 'cmquerycl' performs this qualifying.

There are disasters to test for during your failover testing after the cluster has been created. You should be pulling LAN cables as a part of this testing to see how the primary heartbeat LAN is picked up by the standby heartbeat LAN. Again, use 'cmviewcl -v' and 'cmscancl -o file' for this.

This URL gives a nice example. Please ignore the SAM references. I'm not advocating that you use SAM for this, in fact, just the contrary.

http://docs.hp.com/cgi-bin/fsearch/framedisplay?top=/hpux/onlinedocs/B3936-90053/B3936-90053_top.html&con=/hpux/onlinedocs/B3936-90053/00/00/36-con.html&toc=/hpux/onlinedocs/B3936-90053/00/00/36-toc.html&searchterms=heartbeat%7ccmquerycl%7ccluster&queryid=20030515-054222