SAS — Serial Attached SCSI
Definition
A point-to-point serial protocol for connecting storage devices (HDDs, SSDs, tape) to a host bus adapter or RAID controller. SAS is the modern successor to parallel SCSI.
Context & Usage
SAS dominates enterprise server storage because of dual-port redundancy, hot-swap capability, and superior reliability vs SATA. Current generation is SAS-3 (12 Gb/s); SAS-4 (24 Gb/s) is emerging. SAS controllers accept both SAS and SATA drives (with SATA running in single-port mode). Major SAS controller brands: Dell PERC, HPE Smart Array, LSI/Broadcom MegaRAID.
Examples
- Seagate Exos 22 TB SAS HDD
- Samsung PM1733 1.6 TB SAS SSD
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