Parallel cables had flat ribbon-like wires with 40-pins on each end, with a wire count of either 40 or 80 – depending on the use of one or two wires to connect the pins on both ends of the cable.ĭue to the high number of wires, the older parallel PATA cables were wider and thinner and, as with parallel communication, the cables supported two separate communication lanes for sending and receiving data with plenty of lanes (wires) in them. Electromagnetic interference, within the individual server, and higher manufacturing costs were important reasons why the industry has abandoned them and moved forward to the newer SATA/SAS cabling designs. Pre-SATA – A bit of historyīefore SATA we had Parallel ATA (PATA) and Small Computer Systems Interface (SCSI) disks. That doesn’t mean you should immediately write SSDs off of your shopping list because, when used smartly, they can greatly improve your OpenZFS server performance. SSD disks are relatively new and some of them provide dazzling read and write speeds but the price tag is still a deterrent for most high-density storage applications. They use serial communication which means some of those drives can receive and send data on two active communication channels at the same time on the same cable. SAS and SATA drives are the standard these days. This will affect many other factors such as chassis backplane, individual disk IOPS, latency, and overall storage node throughput. Interface: SATA, SAS, U.2 and PCIeĭecide on the type of physical interface you will use. It is also important to understand how the Form Factor, combined with the physical interface and the used protocol, can affect the available storage capacities and the technical capabilities of a disk such as power failure protection and endurance. ![]() It is important to distinguish between the type of the disk’s physical interface and the communication protocol it uses.
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