Disk group attributes are parameters that are bound to a disk group, rather than an Oracle ASM instance.app
Disk group attributes can be set when a disk group is created or altered, unless otherwise noted in the following list.less
This attribute can only be set when altering a disk group.spa
For information about the ACCESS_CONTROL.ENABLED
attribute, see "Setting Disk Group Attributes for Oracle ASM File Access Control".rest
This attribute can only be set when altering a disk group.orm
For information about the ACCESS_CONTROL.UMASK
attribute, see "Setting Disk Group Attributes for Oracle ASM File Access Control".server
This attribute can only be set when creating a disk group.ci
For information about allocation unit size and extents, see "Allocation Units", "Extents", and "Specifying the Allocation Unit Size". For an example of the use of the AU_SIZE
attribute, see Example 4-1, "Creating the DATA disk group".
This attribute is only applicable to Oracle Exadata storage.
See Also:
Oracle Exadata documentationFor information about the COMPATIBLE.ASM
attribute, see "COMPATIBLE.ASM".
For information about the COMPATIBLE.RDBMS
attribute, see "COMPATIBLE.RDBMS".
For information about the COMPATIBLE.ADVM
attribute, see "COMPATIBLE.ADVM" and "Overview of Oracle ASM Dynamic Volume Manager".
The CONTENT.TYPE
attribute identifies the disk group type: data
, recovery
, or system
. The type value determines the distance to the nearest neighbor disk in the failure group where Oracle ASM mirrors copies of the data. The default value is data
which specifies a distance of 1 to the nearest neighbor disk. A value of recovery
specifies a distance of 3 to the nearest neighbor disk and a value of system
specifies a distance of 5.
The attribute can be specified when creating or altering a disk group. If CONTENT.TYPE
attribute is set or changed using ALTER
DISKGROUP
, then the new configuration does not take effect until a disk group rebalance is explicitly run.
The CONTENT.TYPE
attribute is only valid for disk groups that are set to normal or high redundancy. The COMPATIBLE.ASM
attribute must be set to 11.2.0.3
or higher to enable the CONTENT.TYPE
attribute for the disk group.
The attribute can be set with SQL, ASMCMD, or ASMCA. For example:
SQL> CREATE DISKGROUP data NORMAL REDUNDANCY FAILGROUP controller1 DISK '/devices/diska1' NAME diska1, ... ATTRIBUTE 'compatible.asm' = '11.2.0.3', 'content.type' = 'recovery', ... SQL> ALTER DISKGROUP data SET ATTRIBUTE 'content.type' = 'data';
This attribute is primarily intended for use with Oracle Exadata storage.
See Also:
Oracle Exadata documentationThis attribute can only be set when altering a disk group.
For information about the DISK_REPAIR_TIME
attribute, see "Oracle ASM Fast Mirror Resync".
These attributes are intended for use with Oracle Exadata storage.
See Also:
Oracle Exadata documentationThis attribute can only be set when creating a disk group.
For information about the SECTOR_SIZE
attribute, see "Specifying the Sector Size for Drives".
The STORAGE.TYPE
disk group attribute specifies the type of the disks in the disk group. The possible values are AXIOM
, ZFSSA
, and OTHER
. If the attribute is set to AXIOM
or ZFSSA
, then all disks in the disk group must be of that type. If the attribute is set to OTHER
, then any types of disks can be in the disk group.
If the STORAGE.TYPE
disk group attribute is set to AXIOM
or ZFSSA
, then functionality for Hybrid Columnar Compression (HCC) can be enabled for Pillar Axiom or ZFS storage.
Note:
ZFS storage must be added through Direct NFS (dNFS) and Pillar Axiom storage must be added as SCSI/Fiber Channel.To set the STORAGE.TYPE
attribute, the COMPATIBLE.ASM
and COMPATIBLE.RDBMS
disk group attributes must be set to 11.2.0.3
or higher. For information about disk group compatibility attributes, refer to "Disk Group Compatibility".
The STORAGE.TYPE
attribute can be set when creating a disk group or when altering a disk group. The attribute cannot be set when clients are connected to the disk group. For example, the attribute cannot be set when an Oracle ADVM volume is enabled on the disk group.
The attribute is not visible in the V$ASM_ATTRIBUTE
view or with the ASMCMD lsattr
command until the attribute has been set.