This blog shows how to create a 4K advanced format ASM diskgroup at the command line as shown below. First verify that all LUNs being added to the diskgroup are 4K logical / 4K physical format as shown below.
[root@oracle632 ~]# oracleasm querydisk /dev/mapper/ASM_DATA1
Device "/dev/mapper/ASM_DATA1" is marked an ASM disk with the label "ASM_DATA1"
[root@oracle632 ~]# oracleasm querydisk /dev/mapper/ASM_DATA2
Device "/dev/mapper/ASM_DATA2" is marked an ASM disk with the label "ASM_DATA2"
[root@oracle632 ~]# oracleasm querydisk /dev/mapper/ASM_DATA3
Device "/dev/mapper/ASM_DATA3" is marked an ASM disk with the label "ASM_DATA3"
[root@oracle632 ~]# oracleasm querydisk /dev/mapper/ASM_DATA4
Device "/dev/mapper/ASM_DATA4" is marked an ASM disk with the label "ASM_DATA4"
[root@oracle632 ~]# oracleasm querydisk /dev/mapper/ASM_DATA5
Device "/dev/mapper/ASM_DATA5" is marked an ASM disk with the label "ASM_DATA5"
[root@oracle632 ~]# oracleasm querydisk /dev/mapper/ASM_DATA5
Device "/dev/mapper/ASM_DATA5" is marked an ASM disk with the label "ASM_DATA5"
[root@oracle632 ~]# oracleasm querydisk /dev/mapper/ASM_DATA6
Device "/dev/mapper/ASM_DATA6" is marked an ASM disk with the label "ASM_DATA6"
[root@oracle632 ~]# oracleasm querydisk /dev/mapper/ASM_DATA7
Device "/dev/mapper/ASM_DATA7" is marked an ASM disk with the label "ASM_DATA7"
[root@oracle632 ~]# oracleasm querydisk /dev/mapper/ASM_DATA8
Device "/dev/mapper/ASM_DATA8" is marked an ASM disk with the label "ASM_DATA8"
[root@oracle632 ~]#
[root@oracle632 ~]# fdisk -l /dev/mapper/ASM_DATA[12345678] | grep logical
Sector size (logical/physical): 4096 bytes / 4096 bytes
Sector size (logical/physical): 4096 bytes / 4096 bytes
Sector size (logical/physical): 4096 bytes / 4096 bytes
Sector size (logical/physical): 4096 bytes / 4096 bytes
Sector size (logical/physical): 4096 bytes / 4096 bytes
Sector size (logical/physical): 4096 bytes / 4096 bytes
Sector size (logical/physical): 4096 bytes / 4096 bytes
Sector size (logical/physical): 4096 bytes / 4096 bytes
[root@oracle632 ~]#
Create the ASM diskgroup as shown below.
[grid@oracle632 ~]$ pwd
/home/grid
[grid@oracle632 ~]$ ls -lrt crt_DATA_ts.sql
-rw-r--r-- 1 grid oinstall 301 Aug 22 15:59 crt_DATA_ts.sql
[grid@oracle632 ~]$ cat crt_DATA_ts.sql
CREATE DISKGROUP DATA
EXTERNAL REDUNDANCY
DISK 'ORCL:ASM_DATA1','ORCL:ASM_DATA2','ORCL:ASM_DATA3','ORCL:ASM_DATA4',
'ORCL:ASM_DATA5','ORCL:ASM_DATA6','ORCL:ASM_DATA7','ORCL:ASM_DATA8'
ATTRIBUTE
'sector_size' = '4096',
'compatible.asm' = '11.2',
'compatible.rdbms' = '11.2';
[grid@oracle631 ~]$
[grid@oracle632 ~]$ sqlplus "/ as sysasm"
SQL*Plus: Release 12.1.0.2.0 Production on Fri Aug 22 16:03:14 2014
Copyright (c) 1982, 2014, Oracle. All rights reserved.
Connected to:
Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Automatic Storage Management option
SQL> set time on timing on verify on feedback on echo on
16:03:25 SQL> spool crt_DATA_ts.log
16:03:41 SQL> @crt_DATA_ts.sql
16:03:49 SQL> CREATE DISKGROUP DATA
16:03:49 2 EXTERNAL REDUNDANCY
16:03:49 3 DISK 'ORCL:ASM_DATA1','ORCL:ASM_DATA2','ORCL:ASM_DATA3','ORCL:ASM_DATA4',
16:03:49 4 'ORCL:ASM_DATA5','ORCL:ASM_DATA6','ORCL:ASM_DATA7','ORCL:ASM_DATA8'
16:03:49 5 ATTRIBUTE
16:03:49 6 'sector_size' = '4096',
16:03:49 7 'compatible.asm' = '11.2',
16:03:49 8 'compatible.rdbms' = '11.2';
Diskgroup created.
Elapsed: 00:00:08.18
16:03:57 SQL>
16:03:57 SQL> exit
Disconnected from Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Automatic Storage Management option
[grid@oracle632 ~]$
Verify the ASM diskgroup using the "asmcmd" command as shown below.
[grid@oracle632 ~]$ asmcmd
ASMCMD> lsdg
State Type Rebal Sector Block AU Total_MB Free_MB Req_mir_free_MB Usable_file_MB Offline_disks Voting_files Name
MOUNTED EXTERN N 4096 4096 1048576 4096 4030 0 4030 0 N DATA/
MOUNTED EXTERN N 512 4096 1048576 512 450 0 450 0 N SYSTEMDG/
ASMCMD> exit
[grid@oracle632 ~]$