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I know that standard SFF-8087 only supports 4 lanes on a single connector. SFF-8643 supports 4 or 8 according to everything i've read, including Wikipedia reference ( https://en.wikipedia.org/wiki/Serial_Attached_SCSI) 0n a single connector.
a b "Serial Attached SCSI Master Roadmap". SCSI Trade Association. 2015-10-14 . Retrieved 2016-02-26. The SFF-8643 is a 36-pin ‘High Density SAS’ connector, and utilizes a plastic body typically used in internal connections. Typical application would be a INTERNAL SAS link between a SAS HBA to SAS drives. These newer SFF-8643 and SFF-8644 HD SAS connector interfaces have essentially replaced the older SFF-8088 external and the SFF-8087 internal SAS interfaces, however CS Electronics continues to support our customers’ needs for the older interface cables and adapters. Multilane Unshielded Serial Attachment Connectors, Rev 2.0". Archived from the original on June 6, 2021.
SFF-8643 Cables & Adapters
No need for SATA interposer cards, which are needed for pseudo–dual-port high availability of SATA HDDs. [56] :17 Mini Multilane 4/8X Shielded Cage/Connector (HDsh), Rev 3.4". Archived from the original on June 6, 2021. This section needs additional citations for verification. Please help improve this article by adding citations to reliable sourcesin this section. Unsourced material may be challenged and removed. ( May 2014) ( Learn how and when to remove this template message) A target: a device containing logical units and target ports that receives device service and task management requests for processing and sends responses for the same requests to initiator devices. A target device could be a hard disk drive or a disk array system.
The SFF-8643 is the latest HD MiniSAS connector design for implementing HD SAS Internal interconnect solutions. SAS 1 defined two types of expander; however, the SAS-2.0 standard has dropped the distinction between the two, as it created unnecessary topological limitations with no realized benefit: Nearline SAS (abbreviated to NL-SAS, and sometimes called midline SAS) drives have a SAS interface, but head, media, and rotational speed of traditional enterprise-class SATA drives, so they cost less than other SAS drives. When compared to SATA, NL-SAS drives have the following benefits: [56] :20 Establish and tear down tunneled connections between SAS initiators and SATA targets connected to SAS expanders
The SFF-8643’s HD MiniSAS external counterpart is the SFF-8644 which is also SAS 3.0 compliant, and also supports 12Gb/s SAS data transfer speeds. a b c d e f g h "SATA vs SAS Hard Drives on Dedicated Servers". Steadfast.net. Steadfast. Archived from the original on 29 June 2013 . Retrieved 2013-08-05. In addition, every SAS device has a SCSI device name, which identifies the SAS device uniquely in the world. One doesn't often see these device names because the port identifiers tend to identify the device sufficiently. Multifunction 6X 24 Gb/s Unshielded Connector, Rev 1.1". Archived from the original on June 6, 2021. LSI First to Ship New High-Performance 12Gb/s SAS Products". SCSITA.org. SCSI Trade Association . Retrieved 2013-12-03.
SAS-1.1 topologies built with expanders generally contain one root node in a SAS domain with the one exception case being topologies that contain two expanders connected via a subtractive-to-subtractive port. If it exists, the root node is the expander, which is not connected to another expander via a subtractive port. Therefore, if a fanout expander exists in the configuration, it must be the domain's root node. The root node contains routes for all end devices connected to the domain. Note that with the advent in SAS-2.0 of table-to-table routing and new rules for end-to-end zoning, more complex topologies built upon SAS-2.0 rules do not contain a single root node.To the cable itself, am I not understanding the cable? Is an SFF-8643 basically the same concept of two SFF-8087's at 6gb/s combined to give 12gb/s speed. If so, if I used an expander to basically 'split' or divide out the SFF-8643 into two lanes supporting 4 devices (or in this case two connectors split to 4 lanes supporting 4 devices each) would that then reduce the speed to 6gb/s. To further that, If I got two HBA cards both with two SFF-8643 connections, then giving me one to one SFF-8643 to SFF-8087 (so four SFF-8643's to four SFF-8087's) would that then give me full 12gb/s speed? Shielded High Speed Serial Multilane Copper Connector, Rev 3.3". Archived from the original on June 6, 2021.
SAS controllers may connect to SATA devices, either directly connected using native SATA protocol or through SAS expanders using Serial ATA Tunneling Protocol (STP). Mini Multilane 4X Shielded Connector Shell and Plug, Rev 3.4". Archived from the original on November 14, 2020. SFP+ 10 Gb/s and Low Speed Electrical Interface, Rev 4.1". Archived from the original on June 6, 2021. SAS hardware allows multipath I/O to devices while SATA (prior to SATA2.0) does not. [11] Per specification, SATA2.0 makes use of port multipliers to achieve port expansion, and some port multiplier manufacturers have implemented multipath I/O using port multiplier hardware.The main purpose is to run Windows Hyper-V server 2016, then on that I would be running an Active Directory Domain Controller on Windows server 2016, another server running Windows SQL server 2016, another running Exchange server, and another running SharePoint Server (SharePoint being the biggest memory hog)
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