Chapter 1. Overview of the IBM Storwize V5000 Gen2 system 5
Managed disk (MDisk) A component of a storage pool that is managed by a clustered
system. An MDisk is part of a RAID array of internal storage or a
SCSI LU for external storage. An MDisk is not visible to a host
system on the SAN.
Node canister A hardware unit that includes the node hardware, fabric, and
service interfaces, SAS expansion ports, and battery. Each
control enclosure contains two node canisters.
PHY A single SAS lane. Four PHYs are in each SAS cable.
Power Supply Unit Each enclosure has two power supply units (PSU).
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.
Serial-Attached SCSI (SAS) ports SAS ports are connections for expansion enclosures and direct
attachment of hosts to access the IBM Storwize V5000 Gen2.
Snapshot An image backup type that consists of a point-in-time view of a
volume.
Storage pool An amount of storage capacity that provides the capacity
requirements for a volume.
Strand The SAS connectivity of a set of drives within multiple
enclosures. The enclosures can be control enclosures or
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 that is assigned to that storage unit.
Traditional RAID (TRAID) Traditional RAID uses the standard RAID levels.
Volume A discrete unit of storage on disk, tape, or other data recording
medium that supports a form of identifier and parameter list,
such as a volume label or input/output control.
Worldwide port names Each Fibre Channel port and SAS port is identified by its
physical port number and worldwide port name (WWPN).
IBM Storwize V5000 Gen2 term Definition
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