IBM Flex System V7000 Expansion Enclosure 4939H29 Benutzerhandbuch

Draft Document for Review January 29, 2013 12:52 pm

IBM Flex System V7000 Storage Node Introduction and Implementation Guide

Event

An occurrence that is significant to a task or system. Events can include 
completion or failure of an operation, a user action, or the change in the state 
of a process.

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 via 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 the 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 
the 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.