Connecting SATA HDDs to SAS port(s). View previous topic :: View next topic  


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paxsali
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PostPosted: Fri, 7th Jun 2019 20:03    Post subject: Connecting SATA HDDs to SAS port(s).
I heard it's possible to connect SATA drives to the SAS port.

How does that work and what cables do you need for this?

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WhiteBarbarian




Posts: 6010
Location: Russia
PostPosted: Fri, 7th Jun 2019 20:26    Post subject:
Didn't try any of this myself. Just got curious and Googled a bit Very Happy

Quote:
For SAS, the two connector segments (power Data)were merged, which makes it possible to attach a SATA drive to a SAS controller using the continuous(SAS) connector known as a SFF-8482 connector, but you cannot hook up a SAS hard drive to a SATA controller. Wikipedia reports" 3.0 Gbit/s drives may be connected to SAS backplanes, but SAS drives may not be connected to SATA backplanes" I assume this is a reference to servers that support both drives. There are signaling voltage differences for sure so even though the Wikipedia has no detailed reference, it is not possible.


https://superuser.com/questions/191681/can-sas-drives-work-on-a-sata-motherboard


SFF-8482



Quote:
SAS and SATA hard drive connectors look similar but there is one difference: with SAS drives, the data and power connectors are actually one, so you cannot plug in a SATA data connector and SATA power separately. This unified connector is the SFF-8482. SFF-8482 is single channel and meant for individual drives. SFF-8482 is also compatible with SATA, so you can attach both SAS and SATA drives.

Most SFF-8482 connectors have two cables attached: one for power, typically the 4-pin molex connector (the old style), and one for data. They will extend the depth of your drive by just over half an inch. The other end of the data connection will be either a SATA-style connector or an SFF-8087 connector. In the latter configuration, the cable is a fanout assembly, with one quad-channel SFF-8087 on one end, and four single-channel SFF-8482 on the other. Some cables have a quad-channel SFF-8484 cable in place of the SFF-8087, but these are rare as SFF-8087 has established itself as the internal multilane SAS connector of choice.

As newer power supplies have fewer and fewer molex connectors, please make sure that you have those available to supply power to your SAS drives. If not, you may need female molex to male SATA power adapters. (Note: these are different than the adapters used to convert molex power supply connectors to SATA hard drives.)

All SFF-8482 cables are wired the same way, so you don't need to worry about directionality.


https://www.pc-pitstop.com/sff-8482
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Nec




Posts: 234
Location: Israhell
PostPosted: Sat, 8th Jun 2019 00:05    Post subject:
It is entirely possible to connect SATA drives into a SAS port. I have done so numerous times in various servers.
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