This chapter provides the following information for each of the Automatic Storage Management (ASM) policies:
Brief description of the policy
Summary of the policy's main properties
Default values for the policy: parameters with their default values and objects excluded by default
Impact of the policy violation
Action to perform when the violation occurs
The Automatic Storage Management target only has storage policies.
The storage policies for the Automatic Storage Management target are:
This policy checks the disk group for disks with disk sizes which vary by more than 5%.
This policy in only valid for Automatic Storage Management (ASM) instances.
The following table lists the policy's main properties.
Severity | Category | Target Type | Versions Affected | Policy Rule EvaluationFoot 1 | Automatically Enabled? | Alert Message |
---|---|---|---|---|---|---|
Warning | Storage | Database Instance | Oracle Server 10g Release 1 or later | The underlying metric has a collection frequency of once every 7 days. | Yes | Disk Group %DISK_GROUP_NAME% contains disks of significantly different sizes. For balanced I/O and optimal performance, disks in a given disk group should have similar size and performance characteristics. |
Footnote 1 The policy rule is evaluated each time its underlying osm_diskGroup_Policies metric is collected.
Parameters and Their Default Values
Parameter default values are dependent on the version of the Oracle Database target. Refer to the Oracle Database documentation for that version of the database target to learn about the parameters and their default values.
Objects Excluded by Default
Not Applicable
Disks in a disk group should have sizes within 5% of each other, unless data migration is in progress. Automatic Storage Management distributes data uniformly proportional to the size of the disks. For balanced I/O and optimal performance, disks in a given disk group should have similar size and performance characteristics.
Remove, replace, or resize disks in the disk group so the size difference between disks is less than 5%.
This policy checks the disk group for disks that have different redundancy attributes.
This policy is only valid for Automatic Storage Management (ASM) instances.
The following table lists the policy's main properties.
Severity | Category | Target Type | Versions Affected | Policy Rule EvaluationFoot 1 | Automatically Enabled? | Alert Message |
---|---|---|---|---|---|---|
Warning | Storage | Database Instance | Oracle Server 10g Release 1 or later | The underlying metric has a collection frequency of once every 7 days. | Yes | Disk Group %DISK_GROUP_NAME% contains disks with different redundancy attributes. This may offer inconsistent levels of data protection. |
Footnote 1 The policy rule is evaluated each time its underlying osm_diskGroup_Policies metric is collected.
Parameters and Their Default Values
Parameter default values are dependent on the version of the Oracle Database target. Refer to the Oracle Database documentation for that version of the database target to learn about the parameters and their default values.
Objects Excluded by Default
Not Applicable
Disks in the same disk group with different redundancy attributes may offer inconsistent levels of data protection.
Move disks with different redundancy attributes into separate disk groups.
This policy checks the disk group, which depends on external redundancy, for disks that are not mirrored or parity protected.
This policy is only valid for Automatic Storage Management (ASM) instances.
The following table lists the policy's main properties.
Severity | Category | Target Type | Versions Affected | Policy Rule EvaluationFoot 1 | Automatically Enabled? | Alert Message |
---|---|---|---|---|---|---|
Warning | Storage | Database Instance | Oracle Server 10g Release 1 or later | The underlying metric has a collection frequency of once every 7 days. | Yes | Disk Group %DISK_GROUP_NAME% depends on external redundancy and has disks that are not mirrored or parity protected. |
Footnote 1 The policy rule is evaluated each time its underlying osm_diskGroup_Policies metric is collected.
Parameters and Their Default Values
Parameter default values are dependent on the version of the Oracle Database target. Refer to the Oracle Database documentation for that version of the database target to learn about the parameters and their default values.
Objects Excluded by Default
Not Applicable
Data loss can occur if the disk group depends on external redundancy and disks are not mirrored or parity protected.
Replace problem disks with mirrored or parity protected disks, or move unprotected disks into a disk group with NORMAL or HIGH redundancy.
This policy has detected that a disk group with normal or high redundancy has mirrored or parity protected disks.
This policy is only valid for Automatic Storage Management (ASM) instances.
The following table lists the policy's main properties.
Severity | Category | Target Type | Versions Affected | Policy Rule EvaluationFoot 1 | Automatically Enabled? | Alert Message |
---|---|---|---|---|---|---|
Informational | Storage | Database Instance | Oracle Server 10g Release 1 or later | The underlying metric has a collection frequency of once every 7 days. | Yes | NORMAL or HIGH redundancy disk group %DISK_GROUP_NAME% has disks that are mirrored or parity protected. Disk resources are wasted, and performance may be unnecessarily affected when both a disk and its owning disk group are providing data redundancy. |
Footnote 1 The policy rule is evaluated each time its underlying osm_diskGroup_Policies metric is collected.
Parameters and Their Default Values
Parameter default values are dependent on the version of the Oracle Database target. Refer to the Oracle Database documentation for that version of the database target to learn about the parameters and their default values.
Objects Excluded by Default
Not Applicable
Disk resources are wasted, and performance may be unnecessarily affected when both a disk and its owning disk group are providing data redundancy.
Replace disks in the NORMAL or HIGH redundancy disk group with unprotected disks.