Definition

SAS SSD (Serial-Attached SCSI solid-state drive)

Contributor(s): Carol Sliwa

A serial-attached SCSI solid-state drive (SAS SSD) is a NAND flash-based storage or caching device designed to fit in the same slot as a hard disk drive (HDD) and use the SAS interface to connect to the host computer. The most common drive form factors for a SAS SSD are 2.5-inch and 3.5-inch. SAS SSD bandwidth options include 3 Gbps, 6 Gbps and 12 Gbps.

A SAS SSD offers faster data transfer rates than a serial ATA (SATA) SSD. In contrast to a SATA SSD, a SAS SSD also supports dual-port operation and builds in features to improve reliability such as advanced error correction, data integrity technology and high signal quality on the cable or backplane.

SAS SSDs are generally more expensive than SATA SSDs. They are primarily used in enterprise servers and storage arrays with application workloads requiring high availability (HA), high input/output (I/O)and low latency. Use cases for SAS SSDs include server virtualization, online transaction processing, high-performance computing and data analytics.

Drive manufacturers sometimes offer SAS SSDs with different write endurance options. For instance, a high-capacity SAS SSD intended for read-intensive workloads might guarantee only one drive write per day (DWPD), while a lower-capacity SAS SSD intended for write-intensive workloads might support up to 25 DWPD.

This was last updated in September 2015

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