DB2 HADR software

**Serge Rielau** · Sep 19 '06, 09:55 PM

Re: DB2 HADR software

RayRay wrote:

I was hoping I might be able to get an answer regarding DB2 and HADR.
Let me preface this by saying that I know very little about networking
and I'm not familiar with the HADR product or clustering. But, I've
been asked to research a couple issues for a client.
>
They are thinking about implementing HADR. They have DB2 production
databases running on more than one box.
>
Does a liscense for HADR need to be purchased for each production box
running DB2, or does the HADR software come standard as long as you are
running the Enterprise Edition of DB2 on each box in question?
>
What would be a recommended architecture for a company that currently
has multiple databases on a couple of production boxes (I know there
are a lot of variables that come into play, but I'm trying to get a
simplistic picture)? Cluster the production boxes together and cluster
the backup (or standby) boxes together? I assume DB2 and HADR have to
be available on each box (production or standby) in question.
>
Please don't get too technical if you respond. Any clarification would
be greatly appreciated.

I can't comment on the licensing. W.r.t. where to run what my
recommendation is to have distribute the primaries across all the
available servers. That way no server is idle and you get the best use
of your resources because every fail over server also acts as primary
for another database.

Cheers
Serge
--
Serge Rielau
DB2 Solutions Development
IBM Toronto Lab

IOD Conference

http://www.ibm.com/software/data/ondemandbusiness/conf2006/

**Mark A** · Sep 19 '06, 09:55 PM

Re: DB2 HADR software

RayRay wrote:

I was hoping I might be able to get an answer regarding DB2 and HADR.
Let me preface this by saying that I know very little about networking
and I'm not familiar with the HADR product or clustering. But, I've
been asked to research a couple issues for a client.
>
They are thinking about implementing HADR. They have DB2 production
databases running on more than one box.
>
Does a liscense for HADR need to be purchased for each production box
running DB2, or does the HADR software come standard as long as you are
running the Enterprise Edition of DB2 on each box in question?
>
What would be a recommended architecture for a company that currently
has multiple databases on a couple of production boxes (I know there
are a lot of variables that come into play, but I'm trying to get a
simplistic picture)? Cluster the production boxes together and cluster
the backup (or standby) boxes together? I assume DB2 and HADR have to
be available on each box (production or standby) in question.
>
Please don't get too technical if you respond. Any clarification would
be greatly appreciated.
>
Thanks for your time,
>
Ray

DB2 ESE comes with an included license for HADR. If you have DB2 WSE or
DB2 Express, you must purchase HADR separately to be licensed on each
machine. If one of your servers has all of the HADR primary databases
on one server, and all the standby databases on the other server, then
you only need a 1 CPU license of ESE on the standby (regardless of the
actual number of CPU's on the standby). This does not prevent you from
temporarily switching primary databases to the standby server because
of some problem with the primary or because of maintenance being done
on the primary.

However, instead of having all the primary databases on one server, and
all the standby databases on the second server, you can have half the
databases as primary on server 1 and half the databases as primary on
server 2. HADR works on database level.

If you have a lot of updates, inserts, and deletes on these databases,
you may want to set up a private Ethernet between the 2 servers to
handle HADR replication traffic, while all the application traffic
comes in through the public Ethernet. If the 2 servers are close enough
together, you can use a simple crossover cable for the private
Ethernet, or set it up on a switch/router/hub if it is bit further away.

**Mark A** · Sep 19 '06, 10:05 PM

Re: DB2 HADR software

One other thing to add is that IBM may be announcing some new high
availability options soon.

**Larry** · Sep 19 '06, 10:55 PM

Re: DB2 HADR software

Just one slight clarification to Mark's post:

"If one of your servers has all of the HADR primary databases
on one server, and all the standby databases on the other server, then
you only need a 1 CPU license of ESE on the standby (regardless of the
actual number of CPU's on the standby)."

Actually, this is true as long as you are not using the entire standby
server for ANY production DB2 workload ... i.e. if it is exclusively a
standby server.

Larry Edelstein

Mark A wrote:

RayRay wrote:
>

>>I was hoping I might be able to get an answer regarding DB2 and HADR.
>>Let me preface this by saying that I know very little about networking
>>and I'm not familiar with the HADR product or clustering. But, I've
>>been asked to research a couple issues for a client.
>>
>>They are thinking about implementing HADR. They have DB2 production
>>databases running on more than one box.
>>
>>Does a liscense for HADR need to be purchased for each production box
>>running DB2, or does the HADR software come standard as long as you are
>>running the Enterprise Edition of DB2 on each box in question?
>>
>>What would be a recommended architecture for a company that currently
>>has multiple databases on a couple of production boxes (I know there
>>are a lot of variables that come into play, but I'm trying to get a
>>simplistic picture)? Cluster the production boxes together and cluster
>>the backup (or standby) boxes together? I assume DB2 and HADR have to
>>be available on each box (production or standby) in question.
>>
>>Please don't get too technical if you respond. Any clarification would
>>be greatly appreciated.
>>
>>Thanks for your time,
>>
>>Ray

>
>
DB2 ESE comes with an included license for HADR. If you have DB2 WSE or
DB2 Express, you must purchase HADR separately to be licensed on each
machine. If one of your servers has all of the HADR primary databases
on one server, and all the standby databases on the other server, then
you only need a 1 CPU license of ESE on the standby (regardless of the
actual number of CPU's on the standby). This does not prevent you from
temporarily switching primary databases to the standby server because
of some problem with the primary or because of maintenance being done
on the primary.
>
However, instead of having all the primary databases on one server, and
all the standby databases on the second server, you can have half the
databases as primary on server 1 and half the databases as primary on
server 2. HADR works on database level.
>
If you have a lot of updates, inserts, and deletes on these databases,
you may want to set up a private Ethernet between the 2 servers to
handle HADR replication traffic, while all the application traffic
comes in through the public Ethernet. If the 2 servers are close enough
together, you can use a simple crossover cable for the private
Ethernet, or set it up on a switch/router/hub if it is bit further away.
>

**Joachim Müller** · Sep 21 '06, 08:15 AM

Re: DB2 HADR software

Mark A schrieb:

One other thing to add is that IBM may be announcing some new high
availability options soon.
>

Hi Mark,

do have more information about this announcement?

Best regards,
Joachim Müller

**Mark A** · Sep 21 '06, 11:15 AM

Re: DB2 HADR software

"Joachim Müller" <jom0309@dougla s-informatik.dewr ote in message
news:eetljm$h5r $1@news.dtag.de ...

Hi Mark,
>
do have more information about this announcement?
>
Best regards,
Joachim Müller

Contact your IBM marketing team and find out if they are willing to provide
you with more information.

DB2 HADR software

DB2 HADR software

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