Unsure as to which metrics are used in calculating SE savings

Page URL

https://docs.netapp.com/us-en/ontap-restapi-9141/ontap/get-storage-aggregates.html

Page title

Retrieve a collection of aggregates for an entire cluster

Summary

Good morning,

I am trying to understand where the savings number in the efficiency_without_snapshots_flexclones section comes from. Specifically, this page lists savings as being calculated by "Space saved by storage efficiencies (logical_used - used)". However, there is no used number in the savings body, there is only the following:

"efficiency_without_snapshots_flexclones": {
          "savings": 18921472000,
          "ratio": 1.161089754140664,
          "logical_used": 136380661760
        }

Which used number should be used for the calculation? I have tried using the used number from the block_storage segment, but that does not seem correct as I can easily end up with negative numbers when performing the logical_used - used calculation.

Thank you!

cwaltham@amazon.com

$ curl -X GET -u ${CREDS} -k "https://${IP}/api/storage/aggregates?fields=*"
{
  "records": [
    {
      "uuid": "fe7ae5e8-9074-11ef-a1d8-017b21d99b8a",
      "name": "aggr1",
      "node": {
        "uuid": "126f5eac-9074-11ef-a1d8-017b21d99b8a",
        "name": "FsxId00c8329a2e66b5e6d-01",
        "_links": {
          "self": {
            "href": "/api/cluster/nodes/126f5eac-9074-11ef-a1d8-017b21d99b8a"
          }
        }
      },
      "home_node": {
        "uuid": "126f5eac-9074-11ef-a1d8-017b21d99b8a",
        "name": "FsxId00c8329a2e66b5e6d-01",
        "_links": {
          "self": {
            "href": "/api/cluster/nodes/126f5eac-9074-11ef-a1d8-017b21d99b8a"
          }
        }
      },
      "snapshot": {
        "files_total": 0,
        "files_used": 0,
        "max_files_available": 0,
        "max_files_used": 0
      },
      "space": {
        "block_storage": {
          "size": 925308932096,
          "available": 794753351680,
          "used": 130555580416,
          "used_percent": 14,
          "full_threshold_percent": 96,
          "physical_used": 133726285824,
          "physical_used_percent": 14,
          "data_compacted_count": 0,
          "data_compaction_space_saved": 0,
          "data_compaction_space_saved_percent": 0,
          "volume_deduplication_shared_count": 0,
          "volume_deduplication_space_saved": 0,
          "volume_deduplication_space_saved_percent": 0
        },
        "snapshot": {
          "used_percent": 0,
          "available": 48700444672,
          "total": 48700469248,
          "used": 24576,
          "reserve_percent": 5
        },
        "cloud_storage": {
          "used": 0
        },
        "efficiency": {
          "savings": 18926166016,
          "ratio": 1.161126385174986,
          "logical_used": 136387784704,
          "cross_volume_background_dedupe": false,
          "cross_volume_inline_dedupe": false,
          "cross_volume_dedupe_savings": false,
          "auto_adaptive_compression_savings": true,
          "enable_workload_informed_tsse": true,
          "wise_tsse_min_used_capacity_pct": 0
        },
        "efficiency_without_snapshots": {
          "savings": 18921472000,
          "ratio": 1.161089754140664,
          "logical_used": 136380661760
        },
        "efficiency_without_snapshots_flexclones": {
          "savings": 18921472000,
          "ratio": 1.161089754140664,
          "logical_used": 136380661760
        }
      },
      "state": "online",
      "snaplock_type": "non_snaplock",
      "create_time": "2024-10-22T12:56:11+00:00",
      "data_encryption": {
        "software_encryption_enabled": false,
        "drive_protection_enabled": false
      },
      "block_storage": {
        "uses_partitions": false,
        "storage_type": "ssd",
        "primary": {
          "disk_count": 8,
          "disk_class": "solid_state",
          "raid_type": "raid0",
          "raid_size": 4,
          "checksum_style": "advanced_zoned",
          "disk_type": "ssd"
        },
        "hybrid_cache": {
          "enabled": false
        },
        "mirror": {
          "enabled": true,
          "state": "normal"
        },
        "plexes": [
          {
            "name": "plex0",
            "_links": {
              "self": {
                "href": "/api/storage/aggregates/fe7ae5e8-9074-11ef-a1d8-017b21d99b8a/plexes/plex0"
              }
            }
          },
          {
            "name": "plex1",
            "_links": {
              "self": {
                "href": "/api/storage/aggregates/fe7ae5e8-9074-11ef-a1d8-017b21d99b8a/plexes/plex1"
              }
            }
          }
        ]
      },
      "cloud_storage": {
        "attach_eligible": false,
        "tiering_fullness_threshold": 50,
        "migrate_threshold": 10,
        "max_cloud_cache_percent": 0,
        "stores": [
          {
            "used": 0,
            "cloud_store": {
              "name": "FSxFabricpoolObjectStore",
              "uuid": "6a7e60a3-9075-11ef-a1d8-017b21d99b8a",
              "_links": {
                "self": {
                  "href": "/api/storage/aggregates/fe7ae5e8-9074-11ef-a1d8-017b21d99b8a/cloud-stores/6a7e60a3-9075-11ef-a1d8-017b21d99b8a"
                }
              }
            }
          }
        ]
      },
      "inode_attributes": {
        "files_total": 31136,
        "files_used": 96,
        "max_files_available": 31136,
        "max_files_possible": 251006112,
        "max_files_used": 96,
        "used_percent": 0
      },
      "volume_count": 2,
      "_links": {
        "self": {
          "href": "/api/storage/aggregates/fe7ae5e8-9074-11ef-a1d8-017b21d99b8a"
        }
      }
    }
  ],
  "num_records": 1,
  "_links": {
    "self": {
      "href": "/api/storage/aggregates?fields=*"
    }
  }
}

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