I understand that companies can end up in situations where there are budget limitations or software restrictions or political constraints to deal with... So I'll try to answer the heart of this question.
It's hard for me to understand how you make the jump from "my OS doesn't support my RAID controller" to "I need PCIe SSDs". But let's look at options:
- Depending on the actual operating system, you can possibly force it to support your hardware.
- But then again, your hardware is too old to run a modern operating system. The HP G5 servers were popular and had a long lifetime in production, but they went end-of-sale in 2008, eight years ago!
- Is there any chance you could use newer hardware? A G6 or newer HP will be supported by every mainstream operating system available now.
- However, you could simply replace the RAID controller with a more suitable model. An HP Smart Array P410 controller and the right internal cabling could be an option.
- For PCIe SSDs, you'll have to take your chances. The PCIe bandwidth and specs on a G5 HP will limit your options. And you'll still need to RAID at the software level. That type of server predates most PCIe SSD options, so you can't expect it to support much; especially boot. You should try something like this, though.
EDIT: The operating system is eComm Station OS/2.
So in this case, you should probably virtualize your OS/2 setup to avoid future problems with hardware and driver support. Or call this guy.