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List:       veritas-ha
Subject:    RE: [Veritas-ha] VCS heartbeat
From:       Gene Henriksen <gene.henriksen () veritas ! com>
Date:       2002-03-07 22:33:37
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A little misunderstanding here.

First, you can have multiple protocols on a NIC, Micro$oft does it all the
time with TCP, NetBEUI and IPX. LLT and TCP can coexist on the same
interface with no problem.

Second, Low-pri does not switch to TCP, it simply reduces the rate of
heartbeats (see the sample llttab in the /opt/VRTSllt), normal HB is 50/100
second apart and low-pri is 100/100 seconds apart. Plus low-pri does not
send status info unless all normal priority links die.

VCS heartbeats are not supported over TCP.

The requirement is for 2 heartbeats. From the Install Guide:
Each cluster configuration requires at least two channels between systems,
one of which
must be a network connection. The

-----Original Message-----
From: Mark Bradfield-Smith 
Sent: Thursday, March 07, 2002 5:22 PM
To: 'Ang Chip Chiang NCS'; 'veritas-ha@mailman.eng.auburn.edu '
Subject: RE: [Veritas-ha] VCS heartbeat


Jayce

As far as I know you cant have a normal heartbeat and a IP address on the
same interface as the heartbeat runs two completely different protocols
called LLT and GAB. (In contrast to TCP).

You can however have what's called a low priority heartbeat on the same
interface . This uses TCP but only communicates that the cluster is up and
its state etc. It doesn't act as a full heartbeat link and updates to the
cluster config are not communicated over this link. In large clusters LAN
traffic can get high due to using TCP.

You can also use a disk heartbeat using shared storage (called gabdisk) that
is similar to other vendors clustering communication. 

VERITAS however does recommend that you have a minimum of three interfaces.
One for IP and two for the heartbeats.


------------------------------
Mark Bradfield-Smith
Systems Engineer
Office:   (61 2) 8220 7000
Mobile:  0419 358 226
VERITAS Software Pty Ltd


-----Original Message-----
From: Ang Chip Chiang NCS [mailto:ccang@ncs.com.sg]
Sent: Friday, 8 March 2002 02:24
To: 'veritas-ha@mailman.eng.auburn.edu '
Subject: [Veritas-ha] VCS heartbeat


Dear all,

I am about to configure VCS on two HP-UX box.
However, I have only 2 NICs on each server and is wondering if the following
config is workable:

NIC1: 
Local physical IP
VCS Virtual IP
VCS Heartbeat2

NIC2: 
VCS Heartbeat1

Pls kindly advice. Thank you.


Regards,
Jayce
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