- access attributes
- Security function that restricts the access to logical volumes. Using Volume Retention Manager, you can assign an access attribute to each volume: read-only, read/write, or protect.
- data retention
- After provisioning your system, you can assign access attributes to open-system volumes to protect the volumes against read, write, and copy operations and to prevent users from configuring LU paths and command devices. Volume Retention Manager software is required to assign access attributes to volumes.
- DP pools
- A group of virtual (thin-provisioned) volumes (V-VOLs) that are used as a single shared pool of storage.
- DP-VOL
- In the mainframe environment, a DP-VOL is a virtual volume (V-VOL) that is used as a journal volume for Universal Replicator for Mainframe.
- dynamic (thin) provisioning
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Dynamic (thin) provisioning is used in enterprise storage to maximize efficiency by allocating physical capacity only as data is written, rather than reserving it upfront. This approach reduces wasted space, improves utilization rates, and offers flexibility for environments where workloads are less rigid and predictable.
- external volume
- A volume on an external storage system that is mapped to a volume on the VSP One Block storage system by using Universal Volume Manager.
- host group
- Host groups are used for mainframe hosts to define control unit (CU) images, storage subsystem IDs (SSIDs), and volume mappings, ensuring proper presentation of CKD devices to the mainframe.
- page
- Dynamic Provisioning pools allocate capacity in pages, ensuring efficient thin provisioning across environments.
- parity groups
- A parity group is a group of data drives for which parity data is stored on the drives instead of on dedicated parity drives. VSP One Block supports RAID5 and RAID6 parity groups.
- pool threshold
- A pool threshold for Dynamic Provisioning pools is a configurable capacity limit that triggers alerts or actions when a Dynamic Provisioning pool approaches its set utilization level, helping administrators prevent over-allocation and ensure stable performance.
- pool volume (pool-VOL)
- A volume that is reserved for storing Dynamic Provisioning data or, Thin Image Advanced snapshot data.
- 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.
- server object
- A set of host groups that are managed together. A server object includes information about each host group's host bus adapters, enabling you to manage the set of host groups as a single object.
- spare area
- In parity groups, the drives have spare area to use in case of a drive failure, and dedicated spare drives are not required.
- subscription limit
- In a thin-provisioned storage system, the proportion (%) of total V-VOL capacity associated with the pool versus the total capacity of the DP pool. You can set the percentage of V-VOL capacity that can be created to the total capacity of the pool. This can help prevent V-VOL blocking caused by a full pool. For example, when the subscription limit is set to 100%, the total DP capacity is equal to the DP pool capacity.
- system option modes (SOMs)
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SOMs are configuration switches built into the storage system that allow administrators to enable or disable specific behaviors at the system level. They are used to fine‑tune how the storage system interacts with hosts, manages data, and enforces operational rules.
- virtual volume (V-VOL)
- A volume that does not have physical storage space. A V-VOL is created from a Dynamic Provisioning pool. A virtual volume is displayed as a volume on VSP One Block Administrator. V-VOLs used for DP are different from V-VOLs used for Thin Image Advanced (called DRS-VOLs). DRD-VOLs are also a type of V-VOL.