The latest supported version of Oracle Solaris for your server is Oracle Solaris 11.3 SRU32.
For other operating systems, the following Hardware Compatibility Lists (HCLs) identify the latest supported operating system versions. To find the latest operating system version supported for the Sun Fire X4470, go to the following sites and search using your server model number:
Oracle Linux – http://linux.oracle.com/pls/apex/f?p=117:1:3991604960223967
Oracle VM – http://linux.oracle.com/pls/apex/f?p=117:1:3991604960223967
Windows – https://www.windowsservercatalog.com/
VMware ESXi – http://www.vmware.com/resources/compatibility/search.php
Red Hat Enterprise Linux – https://access.redhat.com/certifications
SUSE Linux Enterprise Server – https://www.suse.com/products/server