HP D2200sb Serial Attached SCSI technology, 3rd edition - Page 8

SAS/SATA interoperability, SAS topologies - performance

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SAS/SATA interoperability The SAS interface lets you use SAS drives, SATA drives, or both SAS and SATA drives in the same storage enclosure. The SAS architecture allows flexible solutions ranging from entry level NAS in desktop environments to mission-critical RAID systems (Figure 4). With this broad range of storage solutions, you can choose storage devices based on reliability, performance, and cost. Figure 4. Examples of solutions available with SAS architecture SAS supports three communication protocols: • Serial Management Protocol (SMP) manages the point-to-point topology of expanders and enclosures • Serial SCSI Protocol (SSP) facilitates communication with SAS devices and existing SCSI software • SATA Tunneling Protocol (STP) lets SAS controllers communicate with SATA devices through expanders SAS topologies SAS makes it possible to create highly scalable topologies-internal, external, or both-giving you the flexibility to design and deploy a range of solutions. SAS controllers use the SATA Tunneling Protocol (STP) to communicate with SATA devices through expanders. SATA scalability in SAS domains depends on this ability to communicate through expanders. 8

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SAS/SATA interoperability
The SAS interface lets you use SAS drives, SATA drives, or both SAS and SATA drives in the same
storage enclosure. The SAS architecture allows flexible solutions ranging from entry level NAS in
desktop environments to mission-critical RAID systems (Figure 4). With this broad range of storage
solutions, you can choose storage devices based on reliability, performance, and cost.
Figure 4.
Examples of solutions available with SAS architecture
SAS supports three communication protocols:
•
Serial Management Protocol (SMP) manages the point-to-point topology of expanders and
enclosures
•
Serial SCSI Protocol (SSP) facilitates communication with SAS devices and existing SCSI software
•
SATA Tunneling Protocol (STP) lets SAS controllers communicate with SATA devices through
expanders
SAS topologies
SAS makes it possible to create highly scalable topologies—internal, external, or both—giving you
the flexibility to design and deploy a range of solutions. SAS controllers use the SATA Tunneling
Protocol (STP) to communicate with SATA devices through expanders. SATA scalability in SAS
domains depends on this ability to communicate through expanders.
8