Calculating optimal ulimit with RDA - Health Check

That's params from installation docs :

Open file descriptors	nofile	at least 1024	at least 65536
Number of processes available to a single user	nproc	at least 2047	at least 16384
Size of the stack segment of the process	stack	at least 10240 KB	at least 10240 KB, and at most 32768 KB

 We can confirm these parameters with RDA - Health Check utility. RDA - Health Check / Validation Engine Guide (Doc ID 250262.1)

ASM - Disk Operations

DROP DISKGROUP

SQL> column HEADER_STATUS format a20
SQL> set pages 100
SQL> col PATH format a25
SQL> SELECT name, header_status, path FROM V$ASM_DISK ;

NAME                           HEADER_STATUS        PATH
------------------------------ -------------------- -------------------------
                               CANDIDATE            /dev/asm-disk8
                               CANDIDATE            /dev/asm-disk6
                               CANDIDATE            /dev/asm-disk7
DATA_0000                      MEMBER               /dev/asm-disk1
DATA2_0000                     MEMBER               /dev/asm-disk4
DATA_0002                      MEMBER               /dev/asm-disk3
DATA2_0001                     MEMBER               /dev/asm-disk5
DATA_0001                      MEMBER               /dev/asm-disk2

DROP DISKGROUP DATA2 INCLUDING CONTENTS;
drop diskgroup DATA2 force including contents;

Rac-Node2

oracle@testdbrac2:/oracle:>grid_env
oracle@testdbrac2:/oracle:>sqlplus "/as sysasm"

SQL*Plus: Release 11.2.0.1.0 Production on Wed Aug 28 10:49:18 2013

Copyright (c) 1982, 2009, Oracle.  All rights reserved.


Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Real Application Clusters and Automatic Storage Management options

SQL>  select GROUP_NUMBER, NAME, state from v$asm_diskgroup;

GROUP_NUMBER NAME                           STATE
------------ ------------------------------ -----------
           1 DATA                           MOUNTED
           2 DATA2                          MOUNTED

SQL> alter diskgroup DATA2 dismount;

Diskgroup altered.

SQL> select GROUP_NUMBER, NAME, state from v$asm_diskgroup;

GROUP_NUMBER NAME                           STATE
------------ ------------------------------ -----------
           1 DATA                           MOUNTED
           0 DATA2                          DISMOUNTED