September 15, 20232 yr 1. I got very slow sync speed (<50MB/s) after new upgrade to faster hardware (CPU i5-13500 + B760 DS3H latest BIOS + 80GB DDR4), Usually can get over 100MB/s with old system 2. I also added new 2xHBA card and more HDDs (Total 22x Array + 2 Parity) 3. Which device could be problem? tower-4k-diagnostics-20230915-1841.zip Edited September 17, 20232 yr by DNU Tag [SOLVED]
September 15, 20232 yr Community Expert To confirm link speed/width for the HBAs post the output of: lspci -d 1000: -vv
September 15, 20232 yr Community Expert Solution All except the first one have a downgraded link: LnkSta: Speed 5GT/s, Width x1 (downgraded) One of those has 7 devices, so 400/7=57MB/s, around what you are seeing. Issue should also be visible with the diskspeed docker, but if you run the controller test, where all devices on the controller are benchmarked together.
September 15, 20232 yr Community Expert Taking a look at the board you are using, not really a good option for so many controllers: All except the GPU slot are x1, hence why all HBAs except the one using that slot are linking at x1.
September 15, 20232 yr Author 13 minutes ago, JorgeB said: Taking a look at the board you are using, not really a good option for so many controllers: All except the GPU slot are x1, hence why all HBAs except the one using that slot are linking at x1. Oh, I totally screwed this up.
September 15, 20232 yr Author seem like i need to buy new motherboard, anyone have some advice on which model (Intel Gen 13) good to support 3-4 xHBA card?
September 15, 20232 yr Author 32 minutes ago, JorgeB said: One of those has 7 devices, so 400/7=57MB/s, around what you are seeing. Could you educate me, where is 400MB come from?
September 15, 20232 yr Community Expert Desktop boards usually have at most dual x8/x8 for GPUs and one extra x4 PCH slot, though note sure SLI is still a thing with 13th gen, except for Threadripper boards, and of the top of my head, a server board for Intel Xeon or AMD Epic is basically the only way to have 4 CPU x8 slots.
September 15, 20232 yr Community Expert 1 minute ago, DNU said: Could you educate me, where is 400MB come from? A 5Gbps x1 slot is theoretically capable of 500MB/s, but in my experience PCIe has usually a 75/80% overhead, so 400MB/s usable would be a best case scenario.
September 17, 20232 yr Author On 9/15/2023 at 8:53 PM, JorgeB said: All except the first one have a downgraded link: LnkSta: Speed 5GT/s, Width x1 (downgraded) One of those has 7 devices, so 400/7=57MB/s, around what you are seeing. Issue should also be visible with the diskspeed docker, but if you run the controller test, where all devices on the controller are benchmarked together. What if I use HBA + SAS Expander on first PCIEx16 slot (LnkSta: Speed 5GT/s, Width x8) connect with 24x HDDs, How maximum should I can get? Is (8*400)/24 = 133.33MB/s?
September 18, 20232 yr Community Expert See here for some real world numbers: https://forums.unraid.net/topic/41340-satasas-controllers-tested-real-world-max-throughput-during-parity-check/
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