We've had issues with heartbeats being lost but it was always because one node was internally too loaded, and the process sending heartbeats was not getting enough time to run and send those heartbeats. You must figure out what is your network traffic from the apps you're running and make sure you're under the H/W limit. Sending a heartbeat to the other node should not be a problem if you're under the limit. Coman <div>On 11/16/06, David Elliott <<a href="mailto:david.elliott@shazamteam.com">david.elliott@shazamteam.com</a>> wrote:<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> Hello We're running a 2 node rhas4 cluster with gfs and fibre attached storage At the moment we have a pair of bonded 10/100 nics for heartbeat and gfs locking communication (bonded in active/standby mode) There are an additional pair of gigabit nics bonded for general network traffic We've been having some performance issues with GFS which have been investigating - mainly to do with slow file stat operations like find, and ls. a comparison of a data set (700,000 files in a single directory) on gfs and then on ext3 is below # GFS [root@mrapp1 ~]# time ls /free0/partnerimport/data/soap-2/ >/dev/null real 17m10.035s user 0m8.220s sys 0m52.310s # EXT3 [root@mrapp1 ~]# time ls /mr/sig/partnerimport/data/soap-2 > /dev/null real 0m59.854s user 0m5.296s sys 0m0.662s Can anyone confirm whether using a 10/100 nic for heartbeat would be having an impact on performance , and whether it would be advisable to ensure these are gigabit? Many thanks Dave -- Linux-cluster mailing list <a href="mailto:Linux-cluster@redhat.com">Linux-cluster@redhat.com </a> <a href="https://www.redhat.com/mailman/listinfo/linux-cluster">https://www.redhat.com/mailman/listinfo/linux-cluster</a> </blockquote></div> -- Coman ILIUT Mitel Networks Ottawa, ON