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Supporting ASM on 4K/4096 Sector Size (SECTOR_SIZE) Disks (Doc ID 1630790.1)

Last updated on FEBRUARY 21, 2024

Applies to:

Oracle Database - Enterprise Edition - Version to [Release 11.2 to 12.1]
Oracle Database Cloud Schema Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.


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

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 diskgroup attributes must be set to 11.2 or higher to set the sector size to a value other than the default value.




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In this Document
  1) Creating a 4K sector size diskgroup example.
 2) "Supporting ASM on 4 KB Sector Size Disk" technical brief:

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