HP 279720-B21 Serial Attached SCSI storage technology, 2nd Edition
HP 279720-B21 - ProLiant BL p-Class F-GbE Interconnect Manual
UPC - 613326400081
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HP 279720-B21 manual content summary:
- HP 279720-B21 | Serial Attached SCSI storage technology, 2nd Edition - Page 1
devices ...3 Initiators ...4 Expanders ...4 Targets ...4 Differential signaling ...5 SAS protocol evolution ...6 SAS-1 ...6 SAS-2 ...6 SAS-2.1 ...6 Active cables ...6 Storage power management...7 SAS/SATA interoperability ...8 Cabling and connectors ...9 Mini SAS 4x cable connectors and receptacles - HP 279720-B21 | Serial Attached SCSI storage technology, 2nd Edition - Page 2
Redundant Array of Independent Disks (RAID) storage. Since that time, there have been new and expensive technologies. In 2001, HP (Compaq), IBM, LSI Logic, Maxtor, solves the parallel SCSI problems of bus contention, clock another by means of a service delivery subsystem SAS drives that provide - HP 279720-B21 | Serial Attached SCSI storage technology, 2nd Edition - Page 3
link Wide port Zone group Zoned portion of a service delivery subsystem (ZPSDS) International Organization for Standardization/International 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 - HP 279720-B21 | Serial Attached SCSI storage technology, 2nd Edition - Page 4
SAS domain (Figure 1). Each SAS device has a unique worldwide name (SAS address) assigned at manufacturing to simplify its identification in a domain Initiators SAS initiators have multiple ports for connection to internal and/or external targets. Each initiator port can have a single physical link - HP 279720-B21 | Serial Attached SCSI storage technology, 2nd Edition - Page 5
Differential signaling All SAS devices have connection points called ports. One or more transceiver mechanisms, called phys, are located in the port of each SAS device. A physical link, consisting of two wire pairs, connects the transmitter of each phy in one device's port to the receiver of a phy - HP 279720-B21 | Serial Attached SCSI storage technology, 2nd Edition - Page 6
this speed negotiation process, linked SAS devices determine their mutually supported SAS speed(s), and other speed-related options, such as transmission to the SAS-2 standard, SAS-2.1, will define active cables, storage power management, and additional connectors (see ―Cabling and connectors‖). - HP 279720-B21 | Serial Attached SCSI storage technology, 2nd Edition - Page 7
Gbps, active copper and optical cables extend the distance to 20 m. Storage power management SAS-2.1 devices will be able to turn off SAS physical links drives will include more standardized power management features. Today's drives support the Active and Stopped states. The Stopped state is rarely - HP 279720-B21 | Serial Attached SCSI storage technology, 2nd Edition - Page 8
command set, advanced command queuing, and advanced verification/error correction, SAS is the ideal solution for mission-critical enterprise storage applications. SAS supports three protocols to handle communications with various devices: Serial Management Protocol (SMP) - manages the point-to-point - HP 279720-B21 | Serial Attached SCSI storage technology, 2nd Edition - Page 9
Cabling and connectors Mini SAS 4x cable connectors and receptacles Mini SAS 4x connectors and receptacles (Figure 5) are replacing SAS 4x connectors and receptacles in new designs. Mini SAS connectors contain ground pins that can be used for power in active cables. Figure 5. The internal Mini SAS - HP 279720-B21 | Serial Attached SCSI storage technology, 2nd Edition - Page 10
Figure 7 shows the type and location of icons that identify the connectors that attach to an end device, an enclosure ―out‖ port, an enclosure ―in‖ port, and an enclosure universal port. Figure 7. External Mini SAS 4x cable connector icons identify compatible devices and ports. Cable connectors and - HP 279720-B21 | Serial Attached SCSI storage technology, 2nd Edition - Page 11
(SGPIO) busses. The Mini SAS 8x HD (external) connector will support both passive and active cables. SAS topologies SAS makes it possible for drive has a point-to-point connection to the controller. The controller can support a maximum of eight drives. For internal configurations of this type, the - HP 279720-B21 | Serial Attached SCSI storage technology, 2nd Edition - Page 12
10 shows an alternate internal topology for RAID systems using SAS or SATA drives. The full height HP Smart SAS Expander Card supports more than 8 internal hard disk drives on select ProLiant servers when connected to a Smart Array P410 Controller (SA-P410) or Smart Array P410i Controller (SA-P410i - HP 279720-B21 | Serial Attached SCSI storage technology, 2nd Edition - Page 13
SAS or SATA drives. This single controller port incorporates four lanes for a total maximum throughput of 2400 MB/s. The storage enclosure contains an internal 36port expander that supports cascading an additional enclosure in a 1+1 configuration containing up to 25 SFF SAS or SATA drives. Figure 11 - HP 279720-B21 | Serial Attached SCSI storage technology, 2nd Edition - Page 14
between zone groups being controlled. A group of zoning-enabled expanders that cooperate to control access between phys is known as a zoned portion of a service delivery system (ZPSDS). There can be 128 or 256 zone groups numbered from 0 to 127 or 0 to 255, respectively. Zone groups 0 through 8 are - HP 279720-B21 | Serial Attached SCSI storage technology, 2nd Edition - Page 15
expander in the fabric, then the zone manager can reprogram the zone group at the new location. Zoning is ideal for small topologies, server blade enclosures, and clustering applications. Zone management A zone manager is responsible for configuring each zone. As shown in Figure 14 (top), the zone - HP 279720-B21 | Serial Attached SCSI storage technology, 2nd Edition - Page 16
from or to the disk actually begins. The smaller platters of SFF SAS drives inherently yield lower seek times, which is an advantage in file servers with frequent random accesses. 16 - HP 279720-B21 | Serial Attached SCSI storage technology, 2nd Edition - Page 17
In enterprise server environments, SFF SAS drives excel in performance and reliability.1 Since SFF more information, refer to technology brief ―Performance factors for HP ProLiant Serial Attached Storage (SAS)‖ at http://h20000.www2.hp.com/bc/docs/support/SupportManual/c01460725/c01460725.pdf. 17 - HP 279720-B21 | Serial Attached SCSI storage technology, 2nd Edition - Page 18
Performance factors for HP ProLiant Serial Attached Storage (SAS) http://h20000.www2.hp.com/bc/docs/support/SupportManu al/c01460725/c01460725.pdf ProLiant storage papers and audio podcasts http://h18004.www1.hp.com/products/servers/technology/w hitepapers/proliant-storage.html Drive technology
Abstract
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2
Transition from parallel to serial SCSI protocol
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2
SAS terminology
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2
SAS technology
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3
SAS devices
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3
Initiators
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4
Expanders
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4
Targets
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4
Differential signaling
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5
SAS protocol evolution
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6
SAS-1
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6
SAS-2
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6
SAS-2.1
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6
Active cables
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6
Storage power management
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7
SAS/SATA interoperability
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8
Cabling and connectors
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9
Mini SAS 4x cable connectors and receptacles
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9
Mini SAS 8x cable connectors
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11
SAS topologies
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11
Internal
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11
External
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13
Multi-node clusters
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14
Zoning
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SAS performance
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16
For more information
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Call to action
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Serial Attached SCSI storage technology
2nd Edition