It is feasible if your Policyserver is running on Win 2012 R2. Refer below:
Complete the Upgrade Prerequisites - CA Single Sign-On - 12.8 - CA Technologies Documentation
Policy Server and Administrative UI
Review the available upgrade paths for each component.
Note: I represents an in-place upgrade, R represents a rolling upgrade, and P represents a parallel upgrade
The following table lists the possible upgrades to Policy Server 12.8 and Administrative UI 12.8:
Release/Operating System | Windows 2008 | Windows 2008 R2 | Windows 2012 R2 | RHEL 5 32-bit | RHEL 5 64-bit | RHEL 6 32-bit | RHEL 6 64-bit | RHEL 7 64-bit | Solaris 10 | Solaris 11 |
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12.51 | R, P | R, P | n/a | R, P | R, P | R, P | I, R, P | n/a | R, P | R, P |
12.52 SP1 | R, P | R, P | n/a | R, P | R, P | R, P | I, R, P | n/a | R, P | R, P |
12.52 SP2 | n/a | n/a | I, R, P | n/a | n/a | n/a | n/a | n/a | n/a | n/a |
12.6.01 | n/a | n/a | I, R, P | n/a | n/a | n/a | I, R, P | I, R, P | n/a | n/a |
12.7 | n/a | n/a | I, R, P | n/a | n/a | n/a | I, R, P | I, R, P | n/a | n/a |
Review the following consideration:
- The 12.8 Policy Server is a 64-bit executable and requires Windows Server 2012 R2. You cannot perform an in-place upgrade of 12.52 SP2 Policy Server that is insalled in the Program Files (x86) directory. The 12.8 Policy Server is a 64-bit application and only 32-bit applications belong in this directory. If you are upgrading from a release earlier than 12.52 SP2 or if your 12.52 SP2 Policy Server is installed under the Program Files (x86) directory, install a new Policy Server on Windows Server 2012 R2.
Hope this helps !!!
Regards
Ashok