nerbonne Posted September 24, 2021 Share Posted September 24, 2021 I'm looking to upgrade my motherboard and HBA card, and want to ensure I'm picking a good one. Currently I seem to have a bandwidth bottleneck somewhere since during a parity rebuild, I get about 1.5 Gb/s total thru put. I have an LSI 9211-4i card (4 PCIe 2.0 lanes) which is connected to the backplane via a SuperMicro "CBL-0108L-02" SFF8087 to SFF8087 cable. The backplane is a SuperMicro BPN-SAS2-846EL1. All of this hardware is supposed to support 6 Gb/s, so is the bottleneck the 4 PCIe 2.0 lanes? The 4 PCIe 2.0 lanes should be 2 Gb/s? I'm also looking to get a new case and it comes with a 12 Gb/s SAS/SATA expander backplane. So it seems I will need a motherboard that has PCIe 4.0 8 lane. Is there even an affordable HBA that is PCIe 4.0 8 lane? If that's not really worth it, should I just go with the 6 Gb/s backplane? Thanks. Quote Link to comment
JorgeB Posted September 24, 2021 Share Posted September 24, 2021 30 minutes ago, nerbonne said: I get about 1.5 Gb/s total thru put. Assuming you mean 1.5 GB/s that's about the expected, 2GB/s is the theoretical max, you'll never get that, usually you'll get 75 to 80% of that, see below for some more numbers: 32 minutes ago, nerbonne said: Is there even an affordable HBA that is PCIe 4.0 8 lane? Not really, but there are PCIe 3.0 models, and those are good for about 4GB/s with a single link, 6GB/s with dual link. Quote Link to comment
nerbonne Posted September 25, 2021 Author Share Posted September 25, 2021 Thanks for the help! Looks like the easy answer is to install a LSI 9211-8i and I will double my PCIe 2.0 lanes from 4 to 8, which will double my PCIe bandwidth from 2GB/s to 4GB/s? Quote Link to comment
JorgeB Posted September 25, 2021 Share Posted September 25, 2021 Yes, with about 3GB/s usable, 2.2GB/s if connected to an expander with a single link. Quote Link to comment
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.