Error during upgrade : Oracle 11g to 12c While upgrading catupgrade.sql, we are getting below error.


  Due to errors found during the upgrade process, the post
  upgrade actions in catuppst.sql have not been automatically run.
  
  * THEREFORE THE DATABASE UPGRADE IS NOT YET COMPLETE *
  
  
  Evaluate the errors found in the upgrade logs
  and determine the proper action.
  
  
  Execute the post upgrade script as described in Chapter 3
  of the Database Upgrade Guide.
  
  
  
  REASON:
  catuppst.sql unable to run in Database: EluxTest Id: 0
  
          ERRORS FOUND: during upgrade CATCTL ERROR COUNT=6
  
  Identifier CATALOG 20-01-27 02:20:04 Script = c1102000.sql
  ERROR = [ORA-12801: error signaled in parallel query server P000 ORA-01115: IO error reading block from file  (block # )
  
  ORA-01115: IO error reading block from file 2 (block # 215616)
  
  ORA-27072: File I/O error
  
  Additional information: 4
  
  Additional information: 215616
  
  Additional information: 212992
  
  ORA-06512: at line 8
  ]
  STATEMENT = [BEGIN
   EXECUTE IMMEDIATE
    'create unique index WRH$_EVENT_HISTOGRAM_PK on WRH$_EVENT_HISTOGRAM
      (dbid, snap_id, instance_number, event_id, wait_time_milli, con_dbid)
     local nologging parallel
     tablespace sysaux';
  EXCEPTION
   WHEN OTHERS THEN IF (SQLCODE = -942) THEN NULL; ELSE RAISE; END IF;
  END;] 


Tried various solutions mentioned below posted online in various forums, but nothing worked.


Increased SGA to 6GB
Altered Data file sysaux01 to AUTOEXTEND OFF
Altered datafile to ONLINE
The real error is:

ORA-12801: error signaled in parallel query server P000 ORA-01115: IO error reading block from file (block # )
ORA-01115: IO error reading block from file 2 (block # 215616)
ORA-27072: File I/O error
Additional information: 4
Additional information: 215616
Additional information: 212992


The "solutions" you tried make no sense when you get something like this.

Fix the storage/filesystem first.