### Human: Can you tell about NCC Health Check: pd_clones_check. ### Assistant: The NCC health check pd_clones_check verifies the presence of PD (protection domain) clones older than 7 days and verifies if more than 3 clones are restored from a PD.. The NCC Health Check pd_clones_check alerts you of any existing PD (protection domain) clones older than 7 days or a PD with 3 or more clones restored. This NCC check identifies the clones called protection domain clones or backup clones. They are created by running the API v2 call that is only meant to be used by 3-rd party backup software: 

POST /protection_domains/{name}/snapshots/{snapshot_id}/clone

Do not use the above call for normal VM restoration/cloning. This is meant only for backup software.The goal of the NCC check is to alert the Nutanix administrator of a large number of these clones or old clones that may be consuming storage space on the cluster.The NCC alert is raised if either the clone age or the clone count or both are above the configured threshold. You can change the threshold for clone age and clone count in Prism.

Running the NCC CheckRun the following check as part of the full NCC Health Checks: 

POST /protection_domains/{name}/snapshots/{snapshot_id}/clone
Or run the following check separately:

POST /protection_domains/{name}/snapshots/{snapshot_id}/clone

You can also run the checks from the Prism web console Health page: select Actions > Run Checks. Select All checks and click Run.Sample OutputFor status: PASS

POST /protection_domains/{name}/snapshots/{snapshot_id}/clone

For status: FAIL

POST /protection_domains/{name}/snapshots/{snapshot_id}/clone

Output messaging

Check ID110245DescriptionCheck for any clones restored from protection domain snapshots that are too old.Causes of failureClones were not removed automatically.ResolutionsRemove any clones restored from protection domain snapshots that are too old.ImpactStorage performance may be degraded.Alert TitleFound old clones on cluster.Alert MessageFound count clones related to protection domain pd_name which are older than the currently configured threshold of clone_age_threshold days.ScheduleThis check is scheduled to run every day, by default.Number of failures to alertThis check will generate an alert after 1 failure.

Check ID110246DescriptionCheck if there are too many clones restored from protection domain snapshots.Causes of failureClones were not removed automatically.ResolutionsRemove any clones restored from protection domain snapshots that are too old.ImpactStorage performance may be degraded.Alert TitleToo many clones on cluster.Alert MessageFound count clones related to protection domain pd_name which is more than the currently configured threshold of clone_count_threshold.ScheduleThis check is scheduled to run every day, by default.Number of failures to alertThis check will generate an alert after 1 failure.. To restore VMs from snapshots as clones on a DR site use using restore_enties call instead of the clone call:

POST  /protection_domains/{name}/restore_entities

Verify if these clones are created by backup software. If they are, work with the backup vendor to determine if the clones are properly getting deleted and/or if you need to increment the thresholds.When the NCC check indicates there are clones present, you have determined these clones are no longer needed, and the backup software is unable to delete these clones, contact Nutanix Support to remove them.. ### Human: Now explain this as a Nutanix support agent summarizing the answer step by step. In case, you don't know the answer say - I don't know.