First Generation Kinetic HDD
The first Kinetic drive is a 4TB, 5900 rpm, 3.5" hard disk drive (HDD).
Compared to its conventional sister drive, the Kinetic drive implements the Kinetic API that enables key-value object storage. The Kinetic drive replaces the Serial Advance Technology Attachment (SATA) or Serial Attached SCSI (SAS) interface connections with the two 1-Gbps SGMII Ethernet ports, which enables direct network attached connectivity. The Ethernet interface allows communication between drives and direct communication to the datacenter, eliminating the need for Storage Servers for datacenter storage racks.
Drive Form Factor
The mechanical dimensions for the HDD are shown below. Kinetic chassis conform to this standard drive form factor.
Kinetic drives repurposes the standard SAS HDD connector. The connector is defined by and conforms to the dimensions and specifications of SFF-8482 Rev 2.3 [ftp link]. Its placement in the drive form factor is identical to SAS drives.
Two 1-Gbps SGMII Ethernet interfaces are provided through pins S2/S3-S5/S6 and S9/S10-S12/S13, respectively, repurposing the SAS primary and secondary port signals. All drive power and signal assignments, shown in the table below, are identical to the standard SAS drive connector (plug) as outlined in SFF-8482. The specifications for the Ethernet interface were contributed to the Open Compute Project, available for viewing and download below.
|S2||RX0+||Ethernet port 0|
|S3||RX0-||Ethernet port 0|
|S5||TX0-||Ethernet port 0|
|S6||TX0+||Ethernet port 0|
|S9||RX1+||Ethernet port 1|
|S10||RX1-||Ethernet port 1|
|S12||TX1-||Ethernet port 1|
|S13||TX1+||Ethernet port 1|
|P1||PRESENCE DETECT||3.3V tolerant|
|P2||I2C CLOCK||3.3V tolerant|
|P3||I2C DATA||3.3V tolerant|
|P11||RESERVED||Reserved for internal use. Do not connect.|
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