RE: RAC Vs Standby Database between Primary and Secondary Data Centers

  • From: "Goulet, Dick" <richard.goulet@xxxxxxxxxxxxx>
  • To: "Nigel Thomas" <nigel_cl_thomas@xxxxxxxxx>
  • Date: Mon, 21 Jan 2008 12:28:33 -0500

Nigel,

        I have not found any place where I can see that Oracle supports
Stretch clusters and given that you have to use ASM on a RAC install
I've serious doubts about its functionality.  The idea I will agree is
not far fetched, but the time lag that can occur is undoubtly can cause
serious damage to the cluster.  I've run RAC systems before on 10baseT
and it was absolutely unacceptable.  The time delay for the interlink
dragged the system down way too hard.  But times change so let me know
how your project goes.

______________________________________________________________
Dick Goulet / Capgemini
North America P&C / East Business Unit
Senior Oracle DBA / Hosting
Office: 508.573.1978 / Mobile: 508.742.5795 / www.capgemini.com
Fax: 508.229.2019 /  Email: richard.goulet@xxxxxxxxxxxxx
45 Bartlett St. / Marlborough, MA 01752

Together: the Collaborative Business Experience 
______________________________________________________________


-----Original Message-----
From: Nigel Thomas [mailto:nigel_cl_thomas@xxxxxxxxx] 
Sent: Monday, January 21, 2008 12:08 PM
To: Goulet, Dick
Cc: mssql_2002@xxxxxxxxx; oracle-l@xxxxxxxxxxxxx
Subject: Re: RAC Vs Standby Database between Primary and Secondary Data
Centers

Dick

What about "stretch clusters"? You can (allegedly) separate your RAC
nodes by several kilometres (up to 30 miles/50 km seems to be regarded
as acceptable). Of course that has an impact on interconnect speed so
you'd also probably want to partition your workload very carefully - but
the theory is plausible (it had better be - my current project is
expecting to use a stretch cluster).

So if one data center goes down (maybe it was just short of runway 271
at Heathrow the other day), you still have one/some of your nodes in the
surviving centre...

Regards Nigel



----- Original Message ----
From: "Goulet, Dick" <richard.goulet@xxxxxxxxxxxxx>
Sent: Monday, January 21, 2008 3:24:26 PM

Bob,

    RAC is not a High Availability solution in and of itself.  RAC
[snip] ... will protect you against a
single server failure in your local data center.  Standby can protect
you against a single server failure as well, but adds protection for a
9/11 incident at the same time..

______________________________________________________________
Dick Goulet / Capgemini
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Bob Robert
Sent: Tuesday, January 08, 2008 4:16 PM

Gurus,

I need your opinion regarding setting up High Availability solution
between Primary and Secondary Data Centers. Is it better to go with
Oracle RAC or Oracle Standby database.

Thanks In Advance,
Bob

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