So everyone understands the SAS3 interface doubles the bandwidth of the previous generation.
And that a single hard drive regardless of interface will have a sustained sequential considerably lower than what SAS3/SAS2 maxes out on.
I've been telling everyone that the interface doesn't matter for HDD's unless you're dealing with dozens of drives striped for performance. Sustained performance will be similar regardless of raid controller, the drives cache, etc. The speed at which the platters spin will ultimately determine the speed of drive(s).
Then I received a benchmark test with 4 X HGST 6TB SAS3 7200 RPM HDD's which showed sequential read and writes at 6-7GB/s! It was from an HP DL360 g9 and the tool used was crystaldisk mark; meaning it was hardware raid with HP's P440ar running on windows. The 4K read and writes was at 400MB! The volume was 17TB so I'm assuming this is a RAID5 configuration.
--> According to the person who showed me the benchmark claims that SAS3 HDD's do infact have much better performance than any SAS2 drive. With or without hardware RAID.
Can anyone validate this is true? I am running 8 HGST SAS2 drives at home in my NAS box but am using a SAS3 HBA. I have loads of SAS3 drives but never thought about replacing them until I saw the benchmark. Anywhere you search on the net, no where does it explain how these speeds can be reached and most of the literature explains that spinning platters are irrelevant to the two different protocols (SAS2 vs SAS3) as you'll only get a max sustain of 300MB/s per drive.
And that a single hard drive regardless of interface will have a sustained sequential considerably lower than what SAS3/SAS2 maxes out on.
I've been telling everyone that the interface doesn't matter for HDD's unless you're dealing with dozens of drives striped for performance. Sustained performance will be similar regardless of raid controller, the drives cache, etc. The speed at which the platters spin will ultimately determine the speed of drive(s).
Then I received a benchmark test with 4 X HGST 6TB SAS3 7200 RPM HDD's which showed sequential read and writes at 6-7GB/s! It was from an HP DL360 g9 and the tool used was crystaldisk mark; meaning it was hardware raid with HP's P440ar running on windows. The 4K read and writes was at 400MB! The volume was 17TB so I'm assuming this is a RAID5 configuration.
--> According to the person who showed me the benchmark claims that SAS3 HDD's do infact have much better performance than any SAS2 drive. With or without hardware RAID.
Can anyone validate this is true? I am running 8 HGST SAS2 drives at home in my NAS box but am using a SAS3 HBA. I have loads of SAS3 drives but never thought about replacing them until I saw the benchmark. Anywhere you search on the net, no where does it explain how these speeds can be reached and most of the literature explains that spinning platters are irrelevant to the two different protocols (SAS2 vs SAS3) as you'll only get a max sustain of 300MB/s per drive.