[chrisplough]

Arham,

I'm assuming that the 500K OR volume is an annual number? If so, then I would estimate between 1400 - 2500 ORs per day, depending on the weekly cycles of your company. While this is high, it's not within the upper tier of OTM installations. I would definitely recommend using new Linux servers with Intel 5160 or E5355 CPUs and a 2.5GB Java heap. Actual sizing will depend on a variety of factors, including solution complexity, line items, bulk plan size, concurrent users, number of reports, etc.

With high volumes, you'll want to split out the OTM tiers onto separate servers (web, app, rpt, db). Also, your DB server and storage will be critical, as most of OTM's performance issues usually boil down to that tier.

I would also ask you to consider WebLogic as your OTM App server. Oracle's OAS was just supported as of OTM v5.5 CU2, hasn't been production proven, and doesn't support all of the features of OTM (SCA, etc). I was involved with the port of OTM to WebSphere and helped lay the groundwork for the port to OAS before leaving last year. OTM has been running under WebLogic since late 1999 and enjoys a considerable lead over the other app servers with respect to stability, ease of support, performance, etc. I'd look at OAS again with OTM v6.0 or later, once they've had a chance to work out all of the kinks.

Thanks!
--Chris