Spider99 Posted October 14, 2016 Share Posted October 14, 2016 Just testing my config and when i run burst mode on more than disk per controller the individual values reduce although the overall total goes up e.g. ~400MB/s(1 drive) to ~350MB/s (2- 3drives) to ~250MB/s (4 drives) Is this dependant on the CPU threads/ controller/ number of controllers/ number of disks running/ something else? Quote Link to comment Share on other sites More sharing options...
0 Christopher (Drashna) Posted October 14, 2016 Share Posted October 14, 2016 How many? Yes. Mostly, it depends on the hardware. Specifically what communication standard you're using (SATA, SAS, PCI-e), what generation you're using, and the hardware. For instance, I have a IBM ServeRAID M1015, which connects via PCI-e 2.0 x8, meaning that I can 4GB/s between all of the drives, in theory. I say in theory, because the SAS expander the drives are connected to will bottleneck the performance before it hits the controller. 300-500 MB/s per drive is about what you'd expect. As for total? that entirely depends on how the controller is hooked up. And how many PCI-e lanes it has at it's disposal. The more lanes, the more bandwidth it has, and the more drives can be saturated at once. And the more you can safely run at once. Quote Link to comment Share on other sites More sharing options...
0 Spider99 Posted October 14, 2016 Author Share Posted October 14, 2016 well when i re connect my Rocket Raids i hope to be able to do all 8 and the same time and on the other controller to get confidence i have a system i can rely on Quote Link to comment Share on other sites More sharing options...
0 Christopher (Drashna) Posted October 14, 2016 Share Posted October 14, 2016 Well, that's the 2720SGL in your signature, right? Then yeah, that should be able to run 8x drives at 500MB/s give or take. So you should be able to run all of them. (it's a PCI-e 2.0 x8 card, as well). Quote Link to comment Share on other sites More sharing options...
0 Spider99 Posted October 14, 2016 Author Share Posted October 14, 2016 What bios did you use on your RR there are three available Raid/Quick/and Non Raid I had been using Quick but have spotted its from 2012!!!! Where as Non-Raid is 2011 - but just blanks the controller Think i will use the Raid in testing this time as its from 2015 so new ish Quote Link to comment Share on other sites More sharing options...
0 Christopher (Drashna) Posted October 15, 2016 Share Posted October 15, 2016 Raid. As you've noticed, non-RAID doesn't give any info, including a distinct lack of SMART data. I also switched to LSI based controllers, and have been much happier. Quote Link to comment Share on other sites More sharing options...
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Spider99
Just testing my config and when i run burst mode on more than disk per controller the individual values reduce although the overall total goes up
e.g. ~400MB/s(1 drive) to ~350MB/s (2- 3drives) to ~250MB/s (4 drives)
Is this dependant on the CPU threads/ controller/ number of controllers/ number of disks running/ something else?
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