Capacity
| Term | Meaning |
|---|---|
System physical capacity | The total physical capacity that can be allocated within a single system. |
| System free physical capacity | The system physical capacity minus the allocated physical capacity. |
| System virtual capacity | The maximum system capacity that can be defined by pools. This capacity can be larger than the system physical capacity. |
| System free virtual capacity | The system virtual capacity minus the sum of the pools virtual capacity. |
Pools
| Term | Meaning |
|---|---|
| Pool physical capacity | The maximum usable net capacity that can be allocated to the pool entities. |
| Pool virtual capacity | The limit on the size of all volumes (thin and thick provisioned), excluding snapshots. |
| Pool allocated virtual space | The sum of all volumes (thick and thin, excluding thin snapshots). The allocated space cannot exceed the pool virtual capacity. |
| Pool allocated physical space | The sum of all thick volumes, plus the physical space consumed by all the thin volumes and snapshots. The used space cannot exceed the pool physical capacity. |
| Pool free physical space | The defined pool physical capacity minus the allocated physical space. |
| Pool free virtual space | The defined pool virtual capacity minus the allocated virtual space. |
| Reserved space | Automatically defined spare physical space for the pool, to support pool physical space depletion behavior. |
| Emergency buffer | A policy for automatically extending of the pool physical capacity in the event of pool physical space depletion. |
| Limited state | Upon further accepting writes, the pool enters a Limited state where no new volumes can be created, but the existing volumes can be written into. |
| Locked state | If the pool can no longer expand, it enters a Locked state and its entities can no longer accept writes. |
Volumes
| Term | Meaning |
|---|---|
| Volume | A set of consecutively addressed disk blocks that are presented to the storage controller as a range of consecutively numbered logical blocks with disk-like storage and I/O semantics. The InfiniBox volume accepts the following attributes: capacity (size, used capacity, tree allocation), thin provisioning, mapping to a host, write protection, ability to use the system's SSD drives. |
| Thick volume | Reserved-space volume. Virtual and Physical space allocation is done immediately as Thick Volume is created, at the amount of the volume size. |
| Thin volume | Shared-space volume. Thin volumes consume physical space upon writes. The virtual space is allocated upon volume creation to the amount of the volume size. The initially allocated physical space is 0 (zero). In a case of space depletion, the allocation is not guaranteed for thin volumes. |
Filesystems
| Term | Meaning |
|---|---|
| Filesystem | The filesystem controls the way data is stored on the storage system by providing a name to each piece of data (file). The file system allows to search for and access the files. |
Consistency groups
| Term | Meaning |
|---|---|
| Consistency Group (CG) | Container of volumes |
| Group-consistent snapshot | Snapshot operation that is performed on the consistency group entities which ensures that write-order-fidelity is maintained across all the objects in the group |
| Snapshot Group (SG) | Container of snapshots created through a group-consistent snapshot |
| Replica consistency group | Consistency group that belongs to a replica (either as a source or as a target) |
Network spaces
| Term | Meaning |
|---|---|
| WWPN | World Wide Port Name. A globally unique ID for each FC port. The equivalent of MAC address in Fiber Channel. |
| WWNN | World Wide Node Name. A globally unique ID for a system / group of WWPNs. |
| Multipath driver | Host-side driver that allows the host to leverage more than 1 path to a LUN. |
| Node | An InfiniBox server. Typically, there are 3 nodes in a system. |
| Ethernet Port (Port) | Physical Ethernet port (copper / optical). |
| Ethernet Interface | One or more Ethernet Ports that are grouped together for the purpose of redundancy and/or performance using LACP. |
| Service | A network data service, e.g. NFS, iSCSI, Replication |
| IP address | A group of floating IP addresses that will offer the service (Each IP offers 1 service). It is recommended that each Network Space will have 6 IP Addresses to ensure even workload distribution. |
| Network | A set of definitions for a network address space, annotated using CIDR. Example: 10.0.0.0/24. |
Replication
Source system | The InfiniBox system whose volume is replicated. |
Target system | The InfiniBox system that the volume is replicated to. |
Source dataset | A volume on the source system that is replicated (or planned to be replicated). |
Target dataset | A volume on the target system that is the destination of the replicated data. A target volume that is part of a replica cannot accept host writes. |
Replica | An entity that matches a pair of source and target volumes and other settings essential for the replication. |
Local | The InfiniBox system through which the user manages the replica. |
Remote | The InfiniBox system at the other end of the replica. Both local and remote system may contain source and target datasets. |
Link | A bidirectional means of communication between local and remote systems. The link is defined via Management. |
Sync job | The process of creating a snapshot of the source and delivering it to the target. |
Sync interval | The amount of time between two planned sync jobs. |
Last edited: 2020-11-05 10:28:15 UTC
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