From: | Hannes Dorbath <light(at)theendofthetunnel(dot)de> |
---|---|
To: | Andrew Sullivan <ajs(at)crankycanuck(dot)ca> |
Subject: | Re: Fault Tolerant Postgresql (two machines, two postmasters, one disk array) |
Date: | 2007-05-17 19:04:14 |
Message-ID: | 464CA72E.7060707@theendofthetunnel.de |
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Thread: | |
Lists: | pgsql-general |
Andrew Sullivan wrote:
> On Thu, May 17, 2007 at 12:50:56PM -0400, John D. Burger wrote:
>> Shoot The Other Node In The Head:
>>
>> http://www.linux-ha.org/STONITH
>
> Right. I have heard people tell me this works as advertised, but
> I've never used it. I can tell you that a certain large, well-known
> blue company has a similar product, that in my experience does _not_
> always work as advertised.
Sure a HA setup is nothing that is setup over a weekend. I've spend
about 3-4 months with testing. Correct node and resource fencing is
essential and any mistake will cause your boxes go split brain. But it's
not that complex either, given a simple 2 node cluster.
Just make sure there are enough completely redundant communication paths
(we have 4) for heartbeat and never run without a correctly configured
and tested STONITH device. In case the STONITH device is a power switch
connected directly to the standby node, there is not so much that can fail.
My experiences with linux-ha are good.
--
Best regards,
Hannes Dorbath
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