March 2, 20251 yr Evening unraid peoples I am suffering from slow parity check speeds(<60MB/s) on a 24-bay system. I believe this is not an uncommon setup, thus any ideas as to where the bottleneck could be is welcome. I built this system end of 2023, thus most parts is relatively new and same firmware. MSI PRO Z690-A Intel® Core™ i7-13700K @ 3366 MHz Memory: 64 GiB DDR5 3x SAS2008 PCI-Express 8 port controllers (IT mode) 24 x ST20000NM007D (20TB Seagate EXOS) ( 8 per controller) Running diskspeed docker, it reports that one controller is running slow: Controller 1 Current & Maximum Link Speed: 5GT/s (PCIe 2) width x8 (4 GB/s max throughput) Controller 2 Current & Maximum Link Speed: 5GT/s (PCIe 2) width x1 (4 GB/s max throughput) Controller 3 Current & Maximum Link Speed: 5GT/s (PCIe 2) width x4 (4 GB/s max throughput) I also have two NVME drives connected (first two M2 ports, but had also tried ports 2 and three without speed difference) I am considering that it could be a shortage PCIe lanes, but then other users with similar 13/14th gen systems would have suffered the same. Any ideas as to what could be causing the x1 width on controller 2? faulty controller? or is something amiss on the motherboard Thx! Controller 1 speed results Controller 2 speed results Controller 3 speed results
March 3, 20251 yr Community Expert Solution 12 hours ago, Neo_x said: Any ideas as to what could be causing the x1 width on controller 2 It's the board, not enough lanes: PCI_E3 & PCI_E4 (from Z690 chipset) Supports up to PCIe 3.0 x4 & 3.0 x1
March 3, 20251 yr Author 7 hours ago, JorgeB said: It's the board, not enough lanes: PCI_E3 & PCI_E4 (from Z690 chipset) Supports up to PCIe 3.0 x4 & 3.0 x1 ok, that is staring me in the face now. whoops! thank you for spotting that. so that doesn't leave lots of options (moving some drives to SATS might give some bandwidth, but it looks like I will need to consider a 16-port SAS controller (if enough capacity is provided by PCI_E1 slot), or change platform(Threadripper?) I like the intel onboard GPU though. sigh Intel why hast thou forsaken me.
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