Key terms

Term	Description
access attributes	Security function used to restrict the access to a logical volume. Using Data Retention Utility, you can assign an access attribute to each volume: read only, read/write, or protect.
capacity expansion	The data compression services provided by the FMD drives, called accelerated compression.
capacity saving	The data deduplication and data compression functions provided by the storage system controllers.
CV	Custom-size volume. OPEN-V volumes are custom-size volumes.
deduplication system data volumes	The volumes used to manage data deduplication in a pool. Deduplication system data volumes (also called DSD volumes) are created when you enable deduplication.
DP pool	A group of DP-VOLs. The DP pool consists of one or more pool-VOLs.
DP-VOL	A virtual volume (V-VOL) used for Dynamic Provisioning.
expiration lock	Security option used to allow or prevent changing of the Data Retention Utility access attribute on a volume.
FMD (flash module drive)	A large-capacity flash module drive (FMD) that supports the accelerated compression functionality. A dedicated drive box is required for FMD drives.
meta_resource	A resource group to which additional resources (other than external volumes) and the resources existing before installing Resource Partition Manager belong.
page	In Dynamic Provisioning, a page is 42 MB of continuous storage allocated from a DP pool to store data written to a DP-VOL.
pool	A set of volumes that are reserved for storing Dynamic Provisioning or Thin Image write data.
pool threshold	In Dynamic Provisioning, the proportion (%) of used capacity of the pool to the total pool capacity. Each pool has its own pool threshold values for warning and depletion.
pool volume (pool-VOL)	A volume that is reserved for storing Dynamic Provisioning data or Thin Image operations.
resource group	A group that consists of one or more resources of the storage system. The resources that can be assigned to a resource group are LDEV IDs, parity groups, iSCSI targets, external volumes, ports, and host group IDs.
tier boundary	The value of the reached maximum I/O counts that each tier can process.
tier relocation	A combination of determining the appropriate storage tier and migrating the pages to the appropriate tier.
tiered storage	A storage hierarchy of layered structures of data drives consisting of different performance levels, or tiers, that match data access requirements with the appropriate performance tiers.