Understanding your StorPool Storage report

StorPool regularly sends reports about the current status of your cluster. Here you can find explanations of the key terms and definitions used in this report.

Key terms explained

The tables in the report contain the following terms:

Usable Cluster Capacity (Usable)

  • The maximum amount of data that can be saved in a given StorPool storage cluster after accounting for data protection and system overhead.

  • Calculated by taking the combined raw capacity of a given set of hardware and factoring in the data protection and system overhead.

Logically Provisioned Capacity (Provisioned)

  • The total addressable space visible to users of the StorPool storage cluster.

  • Calculated by producing a list of all volumes and snapshots in StorPool, and summing the logical size of all volumes and all snapshots without children.

Total Stored Data (Stored)

  • The total amount of data saved in a given cluster.

  • May be split between different Storage Tiers and Templates. For volumes, the saved data is available in the used column in the results of the storpool volume usedSpace CLI command (or the corresponding StorPool API call).

  • The Snapshot Overhead is included.

Provisioned to Stored Ratio (P/S Ratio)

The ratio of logically provisioned capacity to total stored data.

Snapshot Overhead

  • The data stored in snapshots, excluding all data accessible in volumes.

  • Calculated as the sum of storedSize of all volumes and snapshots from the storpool volume status CLI command (or the corresponding StorPool API call), minus the sum of spaceUsed for all volumes from storpool volume usedSpace command (or the corresponding StorPool API call).

Storage Tier (Tier)

A set of data stored and accessible under a specified performance level with parameters defined in the StorPool Software License Agreement.

Here is an example:

Usable

Provisioned

Stored”

P/S Ratio

Snapshot Overhead

Cluster 01

209.5 TB

154.7 TB

130.9 TB

1.18

28.7 TB

Cluster 02

209.5 TB

191.7 TB

165.4 TB

1.16

27.5 TB

Cluster 03

139.7 TB

11.2 TB

10.2 TB

1.09

0.1 TB

Attachment definitions

The attached file of your StorPool report provides a detailed breakdown of storage capacity, usage, and snapshot overhead across different Templates. These definitions help you quickly understand how your storage resources are allocated. The data is in CSV format (one per cluster), and contains the following terms:

Template

  • A named definition of the redundancy scheme, placement group, and other parameters that should be attributed to a group of volumes; see Templates.

  • Volumes in StorPool are created from templates and each snapshot is bound to the template of its volume.

Provisioned Volumes

The sum of the logical size of all volumes created from a template.

Provisioned Snapshots

The sum of the logical size of all snapshots bound to the template of their volumes.

Total Stored

The sum of data saved in all volumes created from a specific template and the data saved in all snapshots bound to the specific template.

Volume Allocated

User data stored and accessible in volumes, excluding Snapshot Overhead.

Capacity

The individual usable capacity of each specific template, calculated assuming no other templates exist in the StorPool storage cluster.

Free Space

  • A high-level estimate of remaining capacity in the storage drives associated with a specific template.

  • Calculated by subtracting Total Stored from Capacity for the specific template.

  • It is an estimate that assumes no other templates exist in the StorPool storage cluster and should not be used to decide whether to add a certain amount of data to volumes created from the specific template.

Here is an example:

Template

Provisioned Volumes

Provisioned Snapshots

Total Stored

Volume Allocated

Capacity

Free Space

nvme

0.3 TB

0.4 TB

0.1 TB

0.1 TB

211.4 TB

211.3 TB

name-0

0.2 TB

1.4 TB

1.0 TB

0.0 TB

211.4 TB

210.4 TB

name-1

0.1 TB

31.0 TB

13.9 TB

0.0 TB

211.4 TB

197.5 TB

tier1

0.1 TB

0.0 TB

0.1 TB

0.1 TB

211.4 TB

211.3 TB

tier2

11.3 TB

11.3 TB

7.5 TB

7.5 TB

211.4 TB

203.9 TB

tier3

45.1 TB

46.3 TB

35.4 TB

33.5 TB

211.4 TB

176.0 TB

tier4

97.7 TB

112.7 TB

72.8 TB

61.1 TB

211.4 TB

138.6 TB