Create a Performance Policy
Performance policies are
intended to be the optimal performance settings for the specific application. The
performance policy helps optimize the performance for a volume based on the expected
characteristics of the application using the volume. The performance policy defines the
behavior of its associated volumes when their limit is exceeded.
You can associate a volume with an existing performance policy or create a new one.
Important:
During replication synchronization, a custom performance policy on the upstream partner is created on the downstream partner, if needed. If a performance policy already exists that is not identical, the partners might fail to synchronize.
This applies only to snapshot replication. Synchronous replication does not use performance policies.
Procedure
- Choose A list of all performance policies and the number of volumes associated with them is displayed. .
- Click the + sign to create a new performance policy.
- Enter a name that reflects the best use of the policy.
- Choose an Application Category from the drop-down list.
-
(Optional) Choose a block size to match the application block
size from the Storage Block Size
drop-down list.
Choices range from 4 KiB to 32 KiB. If in doubt, use the
default of 4 KiB. Note: After the performance policy is created, the block size cannot be changed.
-
(Optional) Deselect the check boxes to disable the compression
or caching options.
Note: Leave compression and caching enabled for most applications.
- Disable compression when the application using the volume precompresses data before storing it or when compression slows write times for an application that requires above-average sequential write throughput.
- Disable caching for applications that use a sequential access to the volumes, such as an exchange log file. Exchange log files are typically stored on different volumes from the database files so caching is unnecessary.
- (Optional) Check Enable deduplication on newly created volumes using this policy if you want to enable deduplication.
-
Choose a Limit Exceeded
Behavior option to set the volume offline or non-writable if the
limit of the volume is exceeded.
Note: Volumes with a no-cache policy cannot be pinned.
- Click Create. The performance policy appears in the selection list when you create or edit a volume.