Free-Form Tags Used for Extended Functionality

On Compute Cloud@Customer, you can use free-form tags to extend the functionality of some services.

Use of these tags counts against your tag limit.

The following list describes the free-form tags:

• PCA_no_lm – Control instance live migration.

  Use this tag to instruct the Compute service not to live migrate an instance. The value can be either True or False.

  By default, an instance can be live migrated, such as when you need to evacuate all running instances from a compute node. Live migration can be a problem for some instances. For example, live migration must not be used for instances in a Microsoft Windows cluster. To prevent an instance from being live migrated, set this tag to True on the instance.

  Specify this tag in the Tagging section of the Create Instance or Edit instance_name dialog, in the oci compute instance launch or oci compute instance update command, or using the API.

  The following is an example option for the oci compute instance launch command:

  --freeform-tags '{"PCA_no_lm": "True"}'

  Setting this tag to True on an instance doesn't prevent the instance from being moved when you change the fault domain. Changing the fault domain isn't a live migration. When you change the fault domain of an instance, the instance is stopped, moved, and restarted.

• PCA_blocksize – Create new volumes with a specific disk block size.

  Use this tag to change the LUN block size used by the underlying storage when a block volume is created. Note – Using this tag doesn't apply to the size of the block volume.

  The default block size is 8192 bytes. To specify a different block size, specify the PCA_blocksize tag in the Tagging section of the Create Block Volume dialog, in the oci bv volume create command, or using the API. Valid values are a power of 2 between 512 and 1M bytes, specified as a string and fully expanded.

  The following is an example option for the oci bv volume create command:

  --freeform-tags '{"PCA_blocksize": "65536"}'

  The block size can't be changed after the volume has been created.