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    EU Amazon FR: WD My Book Duo 24TB €510

    Yeah, but duos have regular wd reds inside, while this is white label hgst
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    EU Amazon FR: WD My Book Duo 24TB €510

    Seems like a good deal https://www.amazon.fr/gp/product/B07W5V8GC9
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    Brocade ICX Series (cheap & powerful 10gbE/40gbE switching)

    I've just received 7150 from ebay, and looks like it won't go past bootloader: Ruckus Wireless Bootloader: 10.1.11T225 (Dec 13 2017 - 03:13:30 -0800) Booted from partition 1 DRAM: Validate Shmoo parameters stored in flash ..... OK Any idea what is wrong and if anything can be done here...
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    Slow read speed for large files

    OK, great, those are actually expected figures for your pool configuration, and apparently the issue is with the network part. I'm not a huge solaris/samba expert, but perhaps this could help? https://napp-it.org/doc/downloads/performance_smb2.pdf
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    Slow read speed for large files

    So assuming that you did clear ARC between "write" and "read" you've got 660MB/s read with 256k recordsize and 1.1GB/s read with 1M recordsize?
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    Slow read speed for large files

    Are you getting the same result when reading that file locally (with dd) with empty ARC?
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    Slow read speed for large files

    L2ARC would have zero impact on your streaming read perfomance unless data has already been read. what is the ashift value for this pool (zdb -C <pool_name> | grep ashift)? when you reading that large file what is an actual IO size (zpool iostat -rp 1 in ZoL)? maybe you can put here all current...
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    Slow read speed for large files

    Try tuning your prefetcher -- start with "echo 67108864 > /sys/module/zfs/parameters/zfetch_max_distance"
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    AOC-SLG3-2M2 to Bifurcate or not Bifurcate on X9DRi-LN4F+

    It is dated 5/23/2018, but I'm not sure if it has been there since that date. Anyways, after upgrading to 3.3 it is possible to choose bifurcation mode in bios -- but that I tried with ruexe tool without success -- and it actually works now.
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    AOC-SLG3-2M2 to Bifurcate or not Bifurcate on X9DRi-LN4F+

    Update: it works with the recent BIOS update
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    AOC-SLG3-2M2 to Bifurcate or not Bifurcate on X9DRi-LN4F+

    It doesn't work on latest BIOS -- indeed only top NVME drive is visible. bifurcation control is grayed out, and setting it manually by ruexe tool doesn't seem to work.