Each node in an HCP system manages its own set of logical volumes. On each node, local storage and NFS (external) volumes have numeric IDs in the range 0 (zero) through 127.
Logical volume 0 (zero) on each node is reserved for the operating system. The IDs for the other volumes depend on the volume type:
- Data volume: Primary running storage that stores object data and does not store the metadata query engine index. Primary running storage is storage that’s managed by HCP and consists of continuously spinning disks. Data volumes on SAN storage have numeric IDs in the range 1 (one) through 63. Data volumes on internal storage have IDs 92 and 93 if your HCP nodes have six spinning drives or twelve SSDs. If your nodes have 12 spinning drives (local storage systems only), you also have data volumes with IDs 94 and 95.
- Index volume (SAIN systems only): Primary running storage that stores only the metadata query engine index. All storage nodes should have the same number of index volumes.
Index volumes have numeric IDs in the range 64 through 91.
Note: Index volumes are not available on SAIN systems with internal SSDs. - Shared volume: Primary running storage that stores both object data and the metadata query engine index. All storage nodes have one shared volume.
For all configurations except all-SSD SAIN systems, the shared volume for each node has a numeric ID in the same range as data volumes.
- Spindown volume (SAIN systems only): Primary spindown storage that stores object data and does not store the metadata query index. Primary spindown storage is storage that’s managed by HCP and consists of disks that can be spun down and spun up as needed. All storage nodes should have the same number of spindown volumes.
Spindown volumes have numeric IDs in the range 96 through 127. The volume numbering starts from 96 and goes up.
- NFS volume or external volume: Extended storage that’s accessed using an NFS mount point. NFS volumes store only object data.
NFS volumes have numeric IDs in the range 96 through 127. The volume numbering starts from 127 and goes down.
For information about the metadata query engine index, primary spindown storage, and NFS storage (external storage), see Administering HCP.