Oracle Solaris 11

Hello Friends

I was running Solaris 10 on SunFire X2200 M2, with 40 Sunray 270 units, and would like to advance to a higher version of Solaris,

Can anybody with experience on this help how to go about it, or if there is any other open source os to go with the hardware advice

Thanks in advance

Why do you need to upgrade? Have you not been applying patches, for example. Or maybe your company stopped support from Oracle.

That is a 10+ year old box. This link shows available OSes as of 2008:
Sun Fire X2200 M2 Server Overview

None of the links on that page work because they point to sun.com and oracle pretty much short circuits all sun.com links to a single oracle front page.. So, you may need an oracle logon - which will require having paid support on your box to access lots of features.