Both were parallel bus multiple drop topologies and this kind of sucked. You probably want to avoid older controllers, cabling, expanders, etc. In particular a lot of it has 2TB size limitations. Most SAS 3Gbps hard drives are fine though. The SATA drive connector has a gap between the signal and power sections, which allows separate power and data cables to be easily connected.
The SAS drive connector does not have a gap, and instead has a second set of pins on top. This second set of pins is the second redundant SAS port. There are pictures of the top and the bottom of the drive connector. See picture of SAS backplane socket. Don't try. SATA drives are inherently single-ported, meaning that they can only be attached to one thing at a time.
SAS devices, however, are usually dual-ported. This means that, electrically, there are two ports on the single SAS connector. One is the primary and one is the secondary.
The secondary port may be supported by a backplane or enclosure to allow the attachment of a second host, or to allow multiple paths back to a host for a high-availability configuration. Some people use a special device called an interposer to take an inexpensive SATA drive and make it look like a nearline SAS drive usually to get multipathing.
Don't do this. They're crummy, just another thing to break. That absolutely won't work. The difference is that they can be longer. SATA is limited to 1 meter. It is therefore best to use cables less than 1 meter long if at all possible.
However, most SAS deployments involve larger numbers of disks, and SAS has some special connectors used to reduce wiring and aggregate lanes together. Four lanes gives you a total capacity of 24Gbps over a single SFF connector. Again, four lanes gives you 48Gbps over a single SFF connector. Now and then you will also see the SFF used for 6Gbps, especially on dense small form factor mainboards, and it is also used for NVMe. Be warned. A multilane connector may be broken into its four individual lanes using a breakout cable.
A breakout cable allows this. Also, in some scenarios, a mainboard may offer discrete SAS ports which you desire to aggregate into a multilane cable, and so reverse-breakout cables are available as well. Internal connectors can be transformed into external connectors using an adapter plate.
This allows you to create servers using storage in more than one chassis. This is "not for beginners" but the concepts aren't hard. Just as with SATA, significant effort has been put into backwards compatibility. Please do not try to use a RAID controller. The use of SATA hard drives on SAS controllers is made possible by the fact that both share the same infrastructure and have similar features.
Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more.
Ask Question. Asked 6 years, 5 months ago. Active 2 years, 9 months ago. Viewed 35k times. I have a motherboard with a lot of SAS connectors. Improve this question. Community Bot 1. Arseni Mourzenko Arseni Mourzenko 1, 7 7 gold badges 21 21 silver badges 41 41 bronze badges. Add a comment. Active Oldest Votes. Yes you might have to buy appropriate SAS cable it's another topic, cheap on ebay from china. Improve this answer. When choosing a drive, keep in mind that not all drives are made to be used in any given environment.
There are many factors to take into consideration, including where and how the unit will be used, which applications will be used, and what the necessary requirements are, as well the capacity levels, performance, reliability, or speed needed. For example, if you are going to use a drive in a 24x7 environment, a desktop drive would not be ideal because it is not designed to operate non-stop.
Further, SAS drives are designed for continuous use. On the other hand, SATA drives generally have higher capacity for the price. Seagate Partner Program Portal Provides access to product training, sales and marketing resources, deal registration, and more to our VARs, Integrators, Resellers and other channel partners.
0コメント