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Fiber Optic Wiki
Fiber Optic Wiki
Nearline SAS
July 29, 2011Nearline SAS or NL-SAS drives are enterprise SATA drives with a SAS interface. Head, media, and rotational speed of traditional enterprise class SATA drives with the fully capable SAS interface typical for classic SAS drives. Vendors like EMC, IBM and Dell are offering these disks for SAN arrays, NAS solutions and server systems.
Topology and connectors
July 29, 2011An initiator may connect directly to a target via one or more PHYs (such a connection is called a port whether it uses one or more PHYs, although the term wide port is sometimes used for a multi-PHY connection).
SAS Expanders
July 29, 2011The components known as Serial Attached SCSI Expanders (SAS Expanders) facilitate communication between large numbers of SAS devices. Expanders contain two or more external expander-ports. Each expander device contains at least one SAS Management Protocol target port for management and may contain SAS devices itself.
Different types of expander
July 29, 2011SAS 1 defined two different types of expander; however, the SAS-2.0 standard has dropped the distinction between the two, as it created unnecessary topological limitations with no realized benefit:
Serial Attached SCSI
July 29, 2011Serial Attached SCSI comprises three transport protocols:
Serial attached SCSI : comparison with SATA
July 29, 2011Systems identify SATA devices by their port number connected to the host bus adapter, while SAS devices are uniquely identified by their World Wide Name (WWN).
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