Can 12g SAS drives be connected to Dell Perc H310, and will Unraid benefit from it?

[jang430]

Hi! I'm using Supermicro X11SSZ-F board.  This board only has 4 SATA 3 ports.  I've connected a Dell Perc H310 to it.  It supports sas 6G, or sata 3.  My drives are currently a mixture of sata 1, sata 2, and 1 to 2 sata 3.  Nothing exceeding 2TB.  I recently see post below. 

 

https://www.ebay.com/itm/HGST-Ultrastar-7K6000-HUS726040AL5210-4TB-SAS-128MB-12Gb-s-3-5-HDD-Low-Hours/273315580028?hash=item3fa2e0c87c

 

It's SAS 12g.  I wonder if I connect to my sas 6g, will my unraid array performance benefit?

 

I currently have 8 drives connected to the H310 using Mini SAS SFF-8087 to 4 SATA cable.  The card has 2 ports.  Can I connect 4 SAS 12g to 1 port, then the other 4 still retain that Mini SAS to SATA drives?  Can it be mix and matched?  

 

Most of all, can unraid array performance improve?

[JorgeB]

You can use them but there won't be any performance benefits.

[jang430]

Again, for confirmation, whether drives are in the array, or parity, won't see any performance benefits?

 

What if your parity is SSD?  Or NVME?  What if SAS drives are used in Parity, and array?  Won't faster drives in parity and array improve performance?

 

Why is there no performance benefits?  

Edited September 27, 2018 by jang430

[JorgeB]

4 hours ago, jang430 said:

Again, for confirmation, whether drives are in the array, or parity, won't see any performance benefits?

No, if the HBA is 6Gb/s any 12Gb/s device will still link @ 6Gb/s.

 

Also no disk currently on the market gets over SAS1/SATA2 speeds, never mind SAS2/SATA3, SSDs are a different story.

[jang430]

And if the 12 Gbps drive run at a theoretical max of 6 Gbps, won't that be a significant improvement from my existing sata 2 or sata 3 drives that don't run at max sata 2 and sata 3 speeds?

 

Follow-up question.  What if the SAS drives are actually SAS SSD 6 Gbps drives?  Will this help?  The premise of course is to buy inexpensive old technology drives at a cheaper price, and still improve from my existing sata 2 or sata 3 speeds.

 

 

[JorgeB]

22 minutes ago, jang430 said:

And if the 12 Gbps drive run at a theoretical max of 6 Gbps, won't that be a significant improvement from my existing sata 2 or sata 3 drives that don't run at max sata 2 and sata 3 speeds?

6 Gbps = SATA3 and no:

2 hours ago, johnnie.black said:

no disk currently on the market gets over SAS1/SATA2 speeds, never mind SAS2/SATA3, SSDs are a different story.

 

 

27 minutes ago, jang430 said:

What if the SAS drives are actually SAS SSD 6 Gbps drives?  Will this help?  The premise of course is to buy inexpensive old technology drives at a cheaper price, and still improve from my existing sata 2 or sata 3 speeds.

Again, 6 Gbps = SATA3, and SATA2 SSDs are pretty rare and old, and won't benefit from a SATA3 HBA.

[jang430]

Are 12 GB SAS on SAS 3 controllers Ok? Will it elevate my current setup?


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[JorgeB]

12 Gbs = SAS3 so obviously OK, it can faster if you use SAS3 SSDs, it will be the same for any SATA SSD