Re: Active/Passive to Active/Active

A/A means separate resource groups running on separate nodes, each doing
work. For example, 2 separate instances of SQL, each running on a different
node. However, you'll notice here that there is no load balancing between
the nodes. Each node runs a different instance of SQL.

If you are only running a single (default) instance of SQL, there is no
possible way to run it A/A. It is inherently configured to only run as
A/P...get it?

A/A is tricky to get right. Not to set up or configure, but to avoid the
temptation to overload / overtax each Active node. Remember that in an A/A
configuration, you should never exceed 50% for each node. You have to have
spare available resources to handle the failover of one node to another
(RAM, Proc, network, etc). If both nodes run at 75% utilization, what
happens when one node fails? Do the math...75% + 75% = 150% = looking for
another job. :)

Hope this helps,
--Ryan

--
Ryan Sokolowski
MVP - Windows Server - Clustering
MCSE, CCNA, CCDA, BCFP


This posting is provided "AS IS" with no warranties, and confers no rights.
"Edwin vMierlo [MVP]" <EdwinvMierlo@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in
message news:eikHXW6GIHA.4272@xxxxxxxxxxxxxxxxxxxxxxx
If your application needs to store data on a disk, then yes, you need a
disk
per application in each of your groups
If your application communicates over the network, e.g. clients need to
connect to it, then you need an IP address and a Network Name for each of
your applications / groups as well.

Best Practice: You should NOT install applications in the Cluster Group on
the Q:\ (Quorum) disk.

Active Active means that node1 runs application1 and node2 runs
application2.

Again, if it is only 1 application, then it will ONLY run on 1 node. MSCS
will not do loadbalancing.
MSCS is a "shared nothing" cluster model, only one node has access to a
resource at the time.

The articles you read are wrong, MSCS does NOT do loadbalancing.
If you have 2 applications, then you can run 1 app on one node and another
on another node, and spread the load this way, but this is not
loadbalacing.

Rgds,
Edwin.


"Srinivasm" <Srinivasm@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:64168656-AB01-4438-9CD4-B7D83638DC2B@xxxxxxxxxxxxxxxx
Hi Edwin,

Thanks for your reply....according to your reply..
1 - I need separate disk ...
Currently I use only 1 disk shared for both machines i.e. Q:\
2 - You mention second application...
I don't have two applications...
Currently my service is installed on both machines, but the service
will
be running only on active machine, because few files are stored on Q:\
3 - Reg. IP and Network Name... I think it should be unique for each
group.... right?

Finally... I did read some articles on google that MSCS also support
loadbalancing with active/active i.e. it can use resources (RAM &
Processor)
on both machines to run the applications....it this wrong?

--
Thanks,
Srinivas


"Edwin vMierlo [MVP]" wrote:

sure

"Srinivasm" <Srinivasm@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:0A4B09F0-D7AF-4EB9-A1FC-BB7D78B70FA0@xxxxxxxxxxxxxxxx
Hi...
I have a active/passive setup in my lab, I want convert it into
active/active cluster..

Is it possible to convert it into from active/passive and
active/active...if
yes how?

1) Create a Group for your Service 1 call it "Service1"
2) Add a Disk, IP and Network name to this "Service1" group
3) Move your "Generic Service" from the Cluster Group to group
"Service1"
4) Test your application
5) Move Group "Service1" to node1

Then your second application

6) Create a Group for your second application, call this "Service2"
7) Add a Disk (this is a different disk !!), IP and Network name to
this
"Service2" group
8) Install your application in group "Service2"
9) Test your application
10) move Group "Service2" to node 2

Active/Active means you have two individual applications not sharing
any
resources, running in two groups who are running on different nodes in
your
cluster.

Please note, this is NOT loadbalancing, MSCS does NOT do loadbalancing.

Hope this helps,
Rgds,
Edwin.








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