March 6, 201610 yr I want to use this case. https://www.xcase.co.uk/4u-rackmount-server-cases/x-case-rm-424-pro-with-sas-expander-sgpio-backplane-649-00-x-case.html It has a integrated expander in the backplane. How will this effect the speed of unRAID? I want to use 2 cables to connect to the backplane.
March 6, 201610 yr I believe you can only use one 4 port SAS cable for all 24 disks, for normal read/write operations it won’t make a difference, but this will considerably affect you parity check/syncs and disk rebuilds, by my calculations and with all 24 disks your max speed should be between 60 and 75MB/s.
March 6, 201610 yr Author Hi, thanks for answering! Where do you base this on because if you check the video the guy explains that you can connect 2 sas cables to the backplane. So if I'm correct 12Gbit/s capacity a cable thus 24 Gbit/s in total. 24Gbit/s / 24 drives = 1 Gbit/s a drive. Is this correct? Edit: Hmm, yeah thus roughly 110MB/s a drive.., and st8000v2 drives can reach 200MB/s?
March 6, 201610 yr Author I don't see anything... This is the case X-CASE RM 424 PRO WITH SAS EXPANDER & SGPIO BACKPLANE. If you follow the link I posted in the first post you also see the case.
March 6, 201610 yr https://www.youtube.com/watch?v=BW7hpty1i9A You should see the youtube video, copy/paste link, it has a single 4 port SAS connection
March 6, 201610 yr OK, looks like there are two models: RM 424 Pro -with Expander – single 4 port SAS port RM 424 Pro-EX Expander Version – dual SAS ports The dual port version should be able to do ~110MB/s.
March 6, 201610 yr In my tests, both SAS2LP and Dell H310 (flashed to LSI9211) with 8 SSDs max out at 320MB/s, so: 320 x 8 = 2560 / 24 = 106.66MB/s
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