From: Green, Simon (SGreen@KRAFTEUROPE.COM)
Date: Fri Oct 18 2002 - 10:58:07 EDT
The serial network is there for a very good reason: to prevent unwanted
takeovers in the event of a network failure.
Although it is not required for HACMP, IBM strongly recommend that you have
one. It doesn't have to be RS232, though. If your sites are not too far
apart you might consider using Target Mode SSA, and an SSA loop with optical
extenders, (which is good for something like 10km, I think).
The need for a serial network is described in the planning guide, or the
Installation and Admin Guide for HACMP/ES.
If you're not able to have a serial network, then you should have at least
two completely separate networks, with no shared components. It would be
nice to have different types of network, (e.g. Ethernet and Token Ring), so
that you're protected from any problems in the drivers.
I won't say that you shouldn't do this, but you need to be careful about it.
I would think that the chances of a network failure over a relatively long
distance are greater than with local servers, which would tend to make a
serial network more important than usual. Pay particular attention to
removing single points of failure from your networks.
Simon Green
Philip Morris ITSC Europe
AIX-L Archive at http://marc.theaimsgroup.com/?l=aix-l&r=1&w=2
AIX FAQ at http://www.faqs.org/faqs/aix-faq/
N.B. Unsolicited email from vendors will seldom be appreciated.
> -----Original Message-----
> From: Dearman, Richard [mailto:rdearm1@UIC.EDU]
> Sent: 18 October 2002 15:38
> To: aix-l@Princeton.EDU
> Subject: HACMP Question
>
>
> I have 3 two node clusters and I was thinking of splitting them up.
> Basically I wanted to take one node from each cluster and
> move it offsite to
> another building. All of our buildings are on the same
> networks and we also
> share a common SAN fabric. So the storage will still be
> available if the
> first node fails.
>
> Does anyone see a problem with this type of setup from and
> hacmp point of
> view. I noticed none of the redbooks for hacmp mention anything about
> failover between locations. I know an rs232 connection
> cann't be used but
> they can still have tcpip communications. I know IBM has a
> product called
> hago but why purchase that product if hacmp works.
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