Which two statements are true concerning ASM diskgroups using disks with a 4k sector size?

Which two statements are true concerning ASM diskgroups using disks with a 4k sector size?

Which two statements are true concerning ASM diskgroups using disks with a 4k sector size?

A.
Their COMPATIBLE.ASM attributes must be set to 12.1 or higher.

B.
Their COMPATIBLE.ASM attributes must be set to 11.2 or higher.

C.
Performance of ACFS is improved by using these diskgroups.

D.
Their COMPATIBLE.RDBMS attributes must beset to 11.2 or higher.

E.
Their sector size attributes can be changed using the ALTER DISKGROUP command.

Explanation:

The values for SECTOR_SIZE can be set to 512, 4096, or 4K if the disks support those values. The default value is platform dependent. The COMPATIBLE.ASM
and COMPATIBLE.RDBMS disk group attributes must be set to 11.2 or higher to set the sector size to a value other than the default value.
Incorrect Answers:
C: Oracle ASM provides support for 4 KB sector disk drives without negatively affecting performance. https://docs.oracle.com/database/121/OSTMG/GUID-8B656725-D347-4166-8775-1070B6C4D580.htm#OSTMG10203

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ziad abuqasem

ziad abuqasem

SECTOR_SIZE specifies the sector size for disks in a disk group and can only be set when creating a disk group. The values can be set to 512, 4096, or 4K if the disks support those values.
The default value is platform dependent.
The COMPATIBLE.ASM and COMPATIBLE.RDBMS disk group attributes must be set to 11.2 or higher to set the sector size to a value other than the default value.
B,D correct

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WGCM

WGCM

C: This is wrong:

Oracle Automatic Storage Management Cluster File System (Oracle ACFS) does not support 4 KB sector drives. There is a performance penalty for Oracle ACFS when using 4 KB sector disk drives in 512 sector emulation mode

E: This is wrong too:

You can use the optional SECTOR_SIZE disk group attribute with the CREATE DISKGROUP SQL statement to specify disks with the sector size set to the value of SECTOR_SIZE for the disk group. Oracle ASM provides support for 4 KB sector disk drives without negatively affecting performance. The SECTOR_SIZE disk group attribute can be set only during disk group creation.

Oracle® Automatic Storage Management – Administrator’s Guide – 12c Release 1 (12.1) – E41058-11

The correct is B and D

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