The Used Storage value on the Dashboard page is the total amount of storage, in bytes, that is currently occupied by object data, object or system metadata, scavenging metadata, or data or metadata protection overhead.
The Used Storage box has a link to the more detailed statistics listed below.
- Object data
- The Object data value is the total amount of storage, in bytes, that is currently occupied by object data. Object data is the exact digital reproduction of data as it existed before it was stored on the S Series Node.
- The Object data value does not include the storage used for the parity chunks the S Series Node generates for object data.
- Object and system metadata
- The Object and system metadata value is the total amount of storage, in bytes, that is currently occupied by object and system metadata:
- Object metadata is information that describes an object (for example, data size and object creation date).
- System metadata is information that the S Series Node uses to manage the use of allocated storage. Allocated storage is the part of total storage that has been formatted for storing object data, object and system metadata, scavenging metadata, and protection overhead. The S Series Node allocates storage as needed.
- The Object and system metadata value does not include the storage used for the parity chunks the S Series Node generates for object and system metadata.
- Scavenging metadata
- The Scavenging metadata value is the total amount of storage, in bytes, that is currently occupied by metadata that can be used to recover objects whose object metadata has been lost or corrupted.
- The S Series Node does not erasure-code scavenging metadata.
- Protection overhead
- The Protection overhead value is the total amount of storage, in bytes, that is currently used for the parity chunks that the S Series Node generates for object data and object and system metadata.
- Used storage
- The Used storage value is the sum of the amounts of storage used for object data, for object and system metadata, for scavenging metadata, and for protection overhead, in bytes. However, because the values for these components are derived from used storage rather than directly observed, the values may be inexact. The sum of the component values may therefore differ from the observed used storage value by as much as several megabytes.
- The amount of used storage is also shown as a percent of total storage.