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Smart scan for ASM disk group in Exadata


Enable smart scan for ASM Disk group while creating disk group in Exadata

SQL> CREATE DISKGROUP data HIGH REDUNDANCY
DISK 'o/*/DATA*'
ATTRIBUTE 'AU_SIZE' = '4M',
          'content.type' = 'data',
          'cell.smart_scan_capable'='TRUE',
          'compatible.rdbms'='11.2.0.2',
          'compatible.asm'='11.2.0.3';

Ref.: http://docs.oracle.com/cd/E80920_01/SAGUG/exadata-administering-asm.htm#SAGUG20526

Check cell smart scan is enables for ASM disk or not:

 Make sure to connect ASM instance, if you connect to DB instance you won't find value.

SELECT dg.name AS diskgroup, SUBSTR(a.name,1,24) AS name, SUBSTR(a.value,1,24) AS value FROM V$ASM_DISKGROUP dg, V$ASM_ATTRIBUTE a
WHERE dg.group_number = a.group_number and a.NAME = 'cell.smart_scan_capable';

EXADATA - Importance of Cellinit.ora and Cellip.ora files
Cellinit.ora and Cellip.ora
After Oracle Exadata Storage Server is configured, the database server host must be configured with the cellinit.ora and the cellip.ora files to use the cell.
The files are located in the /etc/oracle/cell/network-config directory of the database server host.These configuration files contain IP addresses, not host names.
cellinit.ora - This file contains the database IP addresses.
cellip.ora -    This file contains the storage cell IP addresses.
 
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