Skip Headers
Oracle® Enterprise Manager Policy Reference Manual
11g Release 1 (11.1.0.1)

E17019-03
Go to Documentation Home
Home
Go to Book List
Book List
Go to Table of Contents
Contents
Go to Feedback page
Contact Us

Go to previous page
Previous
Go to next page
Next
PDF · Mobi · ePub

1 Automatic Storage Management (ASM) Policies

This chapter provides the following information for each of the Automatic Storage Management (ASM) policies:

The Automatic Storage Management target only has storage policies.

1.1 Storage Policies

The storage policies for the Automatic Storage Management target are:

1.1.1 Disk Group Contains Disks of Significantly Different Sizes

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.

Policy Summary

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.

Defaults

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

Impact of Violation

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.

Action

Remove, replace, or resize disks in the disk group so the size difference between disks is less than 5%.

1.1.2 Disk Group Contains Disks with Different Redundancy Attributes

This policy checks the disk group for disks that have different redundancy attributes.

This policy is only valid for Automatic Storage Management (ASM) instances.

Policy Summary

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.

Defaults

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

Impact of Violation

Disks in the same disk group with different redundancy attributes may offer inconsistent levels of data protection.

Action

Move disks with different redundancy attributes into separate disk groups.

1.1.3 Disk Group Depends on External Redundancy and Has Unprotected Disks

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.

Policy Summary

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.

Defaults

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

Impact of Violation

Data loss can occur if the disk group depends on external redundancy and disks are not mirrored or parity protected.

Action

Replace problem disks with mirrored or parity protected disks, or move unprotected disks into a disk group with NORMAL or HIGH redundancy.

1.1.4 Disk Group - Normal/High Redundancy Has Mirrored/Parity Protected Disks

The Disk Group with NORMAL or HIGH Redundancy Has Mirrored or Parity Protected Disks 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.

Policy Summary

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.

Defaults

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

Impact of Violation

Disk resources are wasted, and performance may be unnecessarily affected when both a disk and its owning disk group are providing data redundancy.

Action

Replace disks in the NORMAL or HIGH redundancy disk group with unprotected disks.