detection of primary server failure

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rkusenet - 28 Nov 2004 12:01 GMT

HDR

IDS 921UC4

In this version DRAUTO has been disabled. Now it is only manual.
How can secondary server detect the failure of primary server in the
shortest possible time without involving a script to poll. I want the
detection
as fast as possible for minimum downtime so that the secondary switches
itself
to primary.

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Obnoxio The Chav - 28 Nov 2004 15:24 GMT

rkusenet said:

> HDR
>
[quoted text clipped - 7 lines]
> itself
> to primary.

Write a script to po ... oh.

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Esteban Casuscelli - 29 Nov 2004 13:22 GMT

If you are looking for "the faster way" you should check if both
servers are up and running or online or whatever you want to do to
check if the engine is up.

Then if the primary goes down you should check first if there are
shared memory segments or oninit processes still running there, if not
try first bringing the primary back up. If it fails then change you
secondary as primary and point your clients to the "new" primary.

I think it is faster if you try first bringing you primary back up
rather than changing you secondary as primary and pointing your
clients to the new primary. And it s worth it to check what happened
on the primary before poiting your clients to the secondary server.

hope this helps,
esteban.-

> HDR
>
[quoted text clipped - 7 lines]
> itself
> to primary.

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rkusenet - 29 Nov 2004 14:48 GMT

I should have been clearer. What I meant was that when the primary
server goes down, is there some sort of alarm generated on the
secondary server (with appropriate alarm code). If yes, then I
can modify the alarm shell to convert the secondary server to a normal
server.

I remember Art mentioning it to me about some alarm which the secondary
server gets when the primary goes down, but I lost all my emails in disk
crash.

Ravi

> If you are looking for "the faster way" you should check if both
> servers are up and running or online or whatever you want to do to
[quoted text clipped - 23 lines]
> > itself
> > to primary.

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Obnoxio The Chav - 29 Nov 2004 16:04 GMT

rkusenet said:

> I remember Art mentioning it to me about some alarm which the secondary
> server gets when the primary goes down, but I lost all my emails in disk
> crash.

Maybe you should configure your mail server to run under HDR... :o)

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