January 7, 20251 yr Hi all, I am currently using a SM X12STH-SYS with a Xeon E-2378. Currently I only have 5 16TB exos drives with 1 being used for parity. To future proof, I got a SM chassis 846, which houses 24 hot swap drive bays in the front. Sadly though, I found out it had a SAS-846-EL1 backplane, which does not support drives over 2TB. So I have ordered a SAS3-846-EL1 and am still looking for a SAS3 HBA to connect it to. My motherboard has a miniSAS connection, but I don't think it supports the expander configuration. Speed will be divided between the 24 drives, as far as I can find online. Which would mean 4x12Gbps, which is about 6GB/s, about 250MB/s/drive. The drive read/write are around 250-260MB/s anyway, so I guess I am not loosing any performance. Do any of you know of negative performance impacts of putting the parity drive(s) on an expander backplane? Or is it much better to connect the partity drives seperately to a SATA connection?
January 7, 20251 yr Community Expert 12 minutes ago, Timonator said: My motherboard has a miniSAS connection, but I don't think it supports the expander configuration. Speed will be divided between the 24 drives, as far as I can find online. Do you mean there's no SAS HBA? One is required, it won't work with a SATA controller.
January 7, 20251 yr Author Currently I don't have a SAS HBA, I am looking into getting one. Does it matter if the HBA is flashed to IT-mode or not? Do you think there will be performance impact using the parity drives on the expander and how big of an impact vs wiring them directly to the motherboard/HBA?
January 7, 20251 yr Community Expert It should be an HBA in IT mode, regarding performance, this will give you an idea:
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