It would appear rather than using Domino clustering you are trying to use
the foundations of Cluster proven.
(Are you ASP switching or are you trying to use mimix to cluster
the IFS rather than Domino clustering).
Assuming you don't want immediate access to the application (which Domino
cluster provides),
Here are the concerns I would have.
ASP swtich,
If Domino crashes (unscheduled outage) on SystemA before the data
can be read on Systemb a consistency check of data will be required.
TLogging will not work as the server names are not the
same.
If the databases are large this can take a long time.
Mimix replication of IFS data.
I would defer to your vender but I have a couple of customers
trying to do this and all are still working on feature issues with mimix.
The biggest issue is write lock management, but again, contact
your vendor.
My experience has been you will not have complete data on a
mirror.
Walter Scanlan
Senior Software Engineer
Certified L3 Senior IT Specialist
WPLC & Cloud Computing
Office: 1 720 342 5837
Cell: 507-990-4539
From: rob@xxxxxxxxx
To: domino400@xxxxxxxxxxxx
Date: 12/18/2012 08:58 AM
Subject: Domino DB access in a High Availability environment.
Sent by: domino400-bounces@xxxxxxxxxxxx
Let's say I have a Domino server, Domino01, on SystemA.
Now I drop that Domino server.
I also perform an H/A switch (Mimix in our shop). So instead of running
DB2 on SystemA it's now running on SystemB. And people are running their
Domino applications on Domino server Domino02 on SystemC.
If I follow the instructions in these two links will this behave?
http://visionsolutions.custhelp.com/app/answers/detail/a_id/3067/p/350
http://www-912.ibm.com/8625680A007CA5C6/1AC66549A21402188625680B0002037E/31D82AB263AE401F8625717E0068D44F
Now let me complicate the issue a little bit.
I did this switch on Friday night. On Saturday afternoon our work is
pretty much done. However we don't switch back until Sunday night at 6pm
so that the brief outage during the switch is consistent and shipping can
be planned around it. But I figure, why not start Domino01 on SystemA at
this time? So, if I have an application running on Domino01 will it try
to access DB2 locally, or, will it behave and access DB2 on SystemB?
Let me give a little more information.
During this switch we modify our DNS to point 'System' from the ip address
associated with SystemA to the IP address associated with SystemB.
However, I've run into a few applications which INSIST that there be an
actual host table entry on SystemA for System.
Knowing this, I suspect Domino would use the host table entry, and the
WRKRDBDIRE entries, locally and keep trying to connect to DB2 on SystemA.
Is this the incentive to create a new lpar, let's call it MAIL1, and move
the Domino servers off of SystemA and put them on MAIL1? Actually, this
would be more in keeping with our other servers. We have a mail2
(strictly for Domino) separate from SystemB. And we have a mail3. Guess
where Domino2 and Domino3 run?
Rob Berendt
midrange.com
