> Please provide suggestions for choosing the platform for our SAP Projects. We want to know the Pros & Cons between Windows & Unix ( HP-UX or IBM-AIX). Is there any standard tool where we can enter the Operating system & Databas and number of users and therefore estimate the cost and performance difference between Unix & Windows Boxes.
You can check the official benchmarks for comparing the operating systems (http://service.sap.com/benchmarks).
Apart from that other non-direct countable factors come into place:
- internal knowledge (a *NIX systems administration is different than Windows, not necessarily more complex but different)
- database choice: each database has its pros and cons, Oracle is the most flexible one, DB2 has some really good features and does things like Oracle RAC does for years (EEE). SQL Server may be very easy to administer so is MaxDB (which is the "cheapest" one in sense of SAP maintenance costs)
- technology - AIX (and Power6) has virtualization by default (LPARs), for Windows you would need to buy additional VMware licenses to virtualize, HP-UX has (depending on the size of the machine) vPars, x64 (AMD/Intel) has also a virtualization ability which you can use with Linux for no additional cost (XEN). Finally Solaris on x64 has containers that can also be used to consolidate systems
If I would do some comparison I would count like
50 % - internal knowledge of operating system and database (and knowledge does not mean "I know how to click")
35 % - software/license costs
15 % - hardware costs
Markus
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