[Veritas-ha] measure VCS heartbeat load ?
gene.henriksen at veritas.com
Wed Sep 8 05:17:57 CDT 2004
Are you using just VCS or the DBE/HA product?
VCS is fine with 10Mb. The load, under normal operating conditions, is 2
heartbeats per second or 2 56 byte packets per second (per cluster node),
hardly a heavy load for 10Mb/sec. During startup of a node when the cluster
is running, there is a transfer of the current configuration by a running
node to the initializing node over the heartbeats links (all loads are
balanced over all high priority links). This probably doesn't exceed more
than a couple of MB in most conditions and only takes a few seconds (watch
hastatus when you boot a new node as it goes from REMOTE BUILD to RUNNING).
Under normal running conditions, other than heartbeats, any commands you
issue, such as "hares -add" or "hagrp -switch" are sent across the links as
are changes in status.
Overall it is a light load.
If you are using DBE/AC (Oracle 9i RAC for example), the minimum
recommendation from Oracle is Gigabit ethernet connections due to the load
RAC places on the links.
From: veritas-ha-admin at mailman.eng.auburn.edu
[mailto:veritas-ha-admin at mailman.eng.auburn.edu] On Behalf Of ssloh
Sent: Wednesday, September 08, 2004 5:28 AM
To: veritas-ha at mailman.eng.auburn.edu
Subject: [Veritas-ha] measure VCS heartbeat load ?
Just wonder is there a way to measure VCS heartbeat load ? that will decide
whether to add or upgrade heartbeat links.
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