Pmc-Sierra US, Inc.

Atit Patel

Larrie Simon Carr

Mathieu Gagnon

Sanjay Goyal

Brett Clark

Cindy Mark

Kaihong Wang

A link negotiation method for enabling communication between first and second Serial Attached Small Computer Interface (SAS) storage devices operably coupled by an optical cable. The method includes continuously transmitting a non-SAS data pattern between the first and second SAS storage devices. In response to successful exchange of the non-SAS data between the first and second SAS storage devices, a SAS data pattern is continuously transmitted between the first and second SAS storage devices. In response to successful exchange of the SAS data pattern between the first and second SAS storage devices, an initial frame is continuously transmitted between the first and second SAS storage devices. Communication between the first and second SAS storage devices is enabled in response successful communication of the initial frame between the first and second SAS storage devices.

Link negotiation method for enabling communication between serial attached small computer interface (SAS) storage devices

SAS/SATA Store-Forward (SSSF) buffering enables SAS/SATA block storage devices capable of slower physical link rates to transfer data at a SAS topology data rate. 6 Gbps SAS and SATA disk drives can exchange data at 12 Gbps with 12 Gbps hosts through 12 Gbps SAS expanders employing an SSSF device. The SSSF device improves data transfer performance in the storage area network by optimizing host-side link utilization. The device includes a host-side interface communicating with the host at a host-side rate, a drive-side interface communicating with the target at a drive-side rate equal to or less than the host-side rate, a buffer receiving SAS frames or SATA FIS's, and control logic to control communication between the host-side interface and buffer at the host-side rate and between the drive-side interface and the buffer at the drive-side rate.

SAS/SATA store-and-forward buffering for serial-attached-SCSI (SAS) storage network

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Breinigsville, PA, United States of America

Atit Patel