ODA – Reducing number of cores : Getting error DCS-10045

To perform some tests in order to determine the accurate number of cores to be used by the database application, I had to increase and decrease the number of CPU cores on an ODA using the DCS stack.  When increasing would never be a problem, decreasing number of CPU cores would fail into a DCS-10045 error.

The ODA was initialized with 6 CPU cores, and purpose was to reduce it to 4 CPU cores (of course for testing 😉 ).

[root@BApdl006060 ~]# odacli list-cpucores

Node  Cores  Modified                       Job Status
----- ------ ------------------------------ ---------------
0     36     February 23, 2018 12:22:12 AM CET Configured
0     6      February 26, 2018 11:41:06 AM CET Configured

Running the below command to reduce CPU cores

[root@BApdl006060 ~]# odacli update-cpucore -c 4

Unfortunately this failed into the error :

DCS-10045:Validation error encountered: reduction in number of cores is not supported

If failing into this case, the tip would be to use the “force” option.

[root@BApdl006060 ~]# odacli update-cpucore -c 4 --force
{
  "jobId" : "5d343d01-6eb1-47f1-af2b-7df3f8adab84",
  "status" : "Created",
  "message" : null,
  "reports" : [ ],
  "createTimestamp" : "February 28, 2018 08:49:21 AM CET",
  "resourceList" : [ ],
  "description" : "CPU cores  service update",
  "updatedTime" : "February 28, 2018 08:49:21 AM CET"
}

Once the job is completed successfully, the ODA is running the expected 4 CPU cores.

root@BApdl006060 ~]# odacli list-cpucores

Node  Cores  Modified                       Job Status
----- ------ ------------------------------ ---------------
0     36     February 23, 2018 12:22:12 AM CET Configured
0     6      February 26, 2018 11:41:06 AM CET Configured
0     4      February 28, 2018 8:49:29 AM CET Configured

[root@BApdl006060 ~]# odacli describe-cpucore

Node  Cores  Modified                       Job Status
----- ------ ------------------------------ ---------------
0     4      February 28, 2018 8:49:29 AM CET Configured

Of course, knowing that reducing the CPU cores is not supported, recommendation would be to use the force option only in test environment and not in production.