Can we run 11g RAC and 12c RAC in the same server?

Question

There is a requirement to run 11g RAC and 12C RAC in the same server for a year or so and then remove 11g RAC?
Current setup:
HP-unix 3 node RAC on 11g R2
4CPU
64 GB RAM
3 TB SAN storage
no ASM
Upgrade setup:
HP-unix 3 node RAC on 12C RAC
8CPU
128 GB RAM
6+ TB SAN storage
ASM
We are asked to use the same server and upgrade Hardware to install and run 12C RAC. What are the implications of running RAC in the same server/nodes?
Thank you for your time!

Answer 1

Hi,
The following table shows you the compatibility between various versions:
Clusterware
ASM
DB
Certified
12.1
12.1
12.1
Y
12.1
12.1
11.2(a)
Y
12.1
12.1
11.1(a)
Y
12.1
12.1
10.2(a)
Y
11.2
11.2(b)
11.2
Y
11.2
11.2(b)
11.1
Y
11.2
11.2(b)
10.2
Y
11.1
11.1
11.1(c)
Y
11.1
11.1
10.2
Y
11.1
11.1
10.1
Y
11.1
10.2
11.1
Y
11.1
10.2
10.2
Y
11.1
10.2
10.1
Y
11.1
10.1(d)
11.1
Y
11.1
10.1(d)
10.2
Y
11.1
10.1
10.1
Y
10.2
10.2
10.2
Y
10.2
10.2
10.1
Y
10.2
10.1(d)
10.2
Y
10.2
10.1
10.1
Y
10.1
10.1
10.1
Y
(a) Pre-12.1 database instances require an ASM instance resident on the same node as the database instance. Pre-12.1 database instances cannot leverage the implicit HA of Flex ASM.
Oracle Clusterware (CRS/GI) - ASM - Database Version Compatibility (Doc ID 337737.1)