IBM Storwize V7000, Введение и руководство по внедрению

Страница: 60 / 670

40
IBM Flex System V7000 Storage Node Introduction and Implementation Guide
Expansion canister A hardware unit that includes the serial-attached SCSI (SAS2) interface
hardware that enables the control enclosure to use the drives of the
expansion enclosure as well as other expansions to be daisy-chained on
behind it.
Expansion enclosure A hardware unit chassis that inserts into the IBM Flex System that includes
expansion canisters, and 24 drive slots used for connecting additional internal
capacity to the IBM Flex System V7000 Storage Control Enclosure.
External V7000
expansion A 2076-212 or 2076-224 IBM Storwize V7000 expansion that is connected to
the IBM Flex System V7000 Storage Control Enclosure by the SAS2 chain to
provide additional storage capacity which resides outside of the IBM Flex
System.
External Virtualized
storage Managed disks (MDisks) that are presented as logical drives by external
storage systems that are to be attached to IBM Flex System V7000 Storage
Node for additional virtual capacity.
Host mapping The process of controlling which hosts have access to specific volumes within
a clustered system.
Internal storage The storage that resides in the control and expansion enclosures or the IBM
Storwize V7000 expansions connected through the SAS2 chain that make up
IBM Flex System V7000 Storage Node.
Lane The name given for a single 6Gbps SAS2 PHY (channel). There are four
lanes (PHY) that make up each SAS2 chain.
Managed disk
(MDisk) A component of a storage pool that is managed by a clustered system. An
MDisk is either a RAID array created using the internal storage, or a Small
Computer System Interface (SCSI) logical unit (LU) for external storage being
virtualized. An MDisk is not visible to a host system on the storage area
network.
PHY A term used to define a single 6Gbps SAS lane. There are four PHYs in each
SAS cable.
Quorum disk A disk that contains a reserved area that is used exclusively for cluster
management. The quorum disk is accessed when it is necessary to
determine which half of the cluster continues to read and write data. Quorum
disks can either be on an MDisks or internal drives.
Snapshot An image backup type that consists of a point-in-time view of a volume.
Storage pool A collection of storage capacity on mdisks that can be used to provide the
capacity requirements for a volume.
Strand The serial-attached SCSI (SAS) connectivity of a set of drives within multiple
enclosures. The enclosures can be either the IBM Flex System V7000
Storage control enclosures or expansion enclosures, or the IBM Storwize
V7000 expansion enclosures.
Thin provisioning or
Thin provisioned The ability to define a storage unit (full system, storage pool, or volume) with
a logical capacity size that is larger than the physical capacity assigned to that
storage unit.
Volume As used with IBM Flex System V7000 Storage Node environments, it is the
virtually defined device created for use by the host or IBM Flex System V7000
Storage Node cluster to store I/O data.
IBM Flex System
V7000 Storage
Node term
Definition