I don't know if I missed any posts on this thread so I will provide some
input and if it has already been covered, then just ignore :)

IBM suggested method for going to PowerHA is to first backup your system
and take that tape to Rochester for 1 week. You and the Lab Services people
will restore your system to one of IBM's. They will then go through the
steps to implement PowerHA including testing your applications to make sure
they will running correctly in an iASP. This process goes a long way to
getting PowerHA up and running as it should be.

Another prep step is to collect data in regards to bandwidth needs. If you
are currently using a logical Replication solution like iTera, Mimix etc
you will probably use/need more bandwidth with PowerHA. Remember any/every
block of data in the iASP will be sent to the target system/iASP

Depending on your current disk usage you may need to purchase additional
disk space to get you from just SYSBAS ( ASP1 ) to the addition iASP.

I want to remember something about V6R1 vs V7R1 and PowerHA, but can't
right now. Maybe your really need 7.1 for this to work the best or at all,,,

On Tue, Dec 31, 2013 at 6:06 AM, Brian <system.i.lists@xxxxxxxxx> wrote:

I need to plot a path to achieve as close to 24x7x365 availability as
possible without breaking the bank which means I may have to take several
incremental steps before reaching the goal. My current environment consists
of a Power7 with 3 of 6 cores activated as the production box and a dual
core Power6 box for test/development. Both are running 6.1 and use internal
disk. Both boxes are single partition but I do have an HMC and the Power7
box is licensed for PowerVM.

We are running a commercial ERP and will be starting a project to develop
some new apps using PHP and Zend Server. A whitepaper I read states that
IBM has tested the ERP and it is capable of running in an iASP.

My immediate needs are to update the ERP system to the latest release level
within the current version and to upgrade the OS to 7.1 without incurring
significant downtime. Eventually, I will need to perform the backups, PTF
installs and other maintenance with near-zero downtime.

I've been reading about PowerHA SystemMirror as well as combing the
archives for posts on PowerHA. Based on what I've read, I think it is
probably a good solution. However, I would have to start with internal
disks since a SAN is cost prohibitive at this point. So would
creating "Switched iASPs" be a good starting point and is there a map
somewhere to get me started down this road?

Thanks in advance for your insights and suggestions.

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