HP DL360 Serial Attached SCSI storage technology, 2nd Edition - Page 3

ISO/IEC Midline devices Phy Physical link SAS address Serial ATA Tunneling Protocol (STP) Serial Management Protocol (SMP) Serial SCSI Protocol (SSP) Service delivery subsystem Subtractive routing Table routing Target Training Virtual phy Wide link Wide port Zone group Zoned portion of a service delivery subsystem (ZPSDS) International Organization for Standardization/International Electrotechnical Commission SAS and SATA drives that provide larger capacity, greater reliability, improved resistance to rotational and operational vibration than Entry level drives, making them better suited for use in multi-drive configurations. The mechanism that contains a transceiver which electrically interfaces to a physical link. Phy is a common abbreviation for the physical layer of the OSI model. Two differential signal pairs, one pair in each direction, that connect two physical phys The identifier of an initiator port, a target port, or an expander device A protocol used to communicate with SATA drives A protocol used to communicate with SAS expanders A protocol used to communicate with SAS drives The part of a SAS I/O system that transmits information between a SAS initiator port and a SAS target port A routing technique used when a device is not able to find other devices in the same subbranch. This will pass the request to a different branch altogether. Table routing is used for identifying devices connected to the expanders connected to a device's own phy. An end device such as a SAS hard disk drive, SATA hard disk drive, or SAS tape drive The process of adapting equalization circuitry in a receiver device to an incoming transmission pattern Contains a vendor-specific interface to another virtual phy A group of physical links that attaches a wide port to another wide port A port that contains more than one phy A set of phys in a zone that all have the same access permission A group of zoning expander devices that cooperate to control access between phys SAS technology SAS is a point-to-point architecture that transfers data to and from SCSI storage devices by using serial communication (one bit at a time). SAS devices and the differential signaling method they use to achieve reliable, high-speed serial communication are described in this section. SAS devices There are three types of SAS devices: initiators, targets, and expanders. An initiator device is a host bus adaptor (HBA), or controller. The initiator is attached to one or more targets-SAS hard disk drives, SATA hard disk drives, and SAS tape drives-to form a SAS domain. Expanders are low-cost, high-speed switches that scale the number of targets attached to an initiator, thereby creating a larger 3