Qsan XS5224D User Manual page 29

LUN
A LUN (Logical Unit Number) is a unique identifier for designating an individual or collection
of physical or virtual storage devices that execute I/O commands with a host computer, as
defined by the SCSI (Small Computer System Interface) standard.
iSCSI
iSCSI (Internet SCSI) is a protocol which encapsulates SCSI (Small Computer System
Interface) commands and data in TCP/IP packets for linking storage devices with servers
over common IP infrastructures.
Fibre Channel
Fibre channel is an extremely fast system interface. It was initially developed for use
primarily in the supercomputing field, but has become the standard connection type for
storage area networks (SAN) in enterprise storage.
SAS
Serial-attached SCSI offers advantages over older parallel technologies. The cables are
thinner, and the connectors are less bulky. Serial data transfer allows the use of longer
cables than parallel data connections.
Thick Provisioning
Thick provisioning is allocated upon creation the physical disk drive space and is equal to
the user capacity seen by the host server. It also called fat provisioning.
Thin Provisioning
Thin provisioning is allocated on-demand and can be less than the user capacity seen by the
host server. It involves using virtualization technology to give the appearance of having
more physical resources than are actually available.
Auto Tiering
Auto Tiering is the automated progression or demotion of data across different tiers (types)
of storage devices and media. The movement of data takes place in an automated way with
the help of software and is assigned to the related media according to performance and
capacity requirements. It also includes the ability to define rules and policies that dictate if
and when data can be moved between the tiers, and in many cases provides the ability to
pin data to tiers permanently or for specific periods of time.
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SANOS Overview