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    EMC KTN-STL3 15 bay chassis

    Background: There's an A controller and a B controller. I think they're labelled as such by arrows on the left side of the picture you posted in the middle of the box. Each controller is connected to one of the two signal paths to a SAS HDD. SATA has only one path, so will be connected only to...
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    EMC KTN-STL3 15 bay chassis

    I didn't recommend any card, but i'm very happy with my older pcie2.0 (ie 9200 type cards). I personally run 60 3.5" disks and 25 2.5" disks in 5 shelves off one of those old cards and since I don't run mirrors everywhere, i'm much more constrained in IOPS than card/bus bandwidth. You should...
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    EMC KTN-STL3 15 bay chassis

    the sff 8088 cables you'll be using carry four sas lanes, meaning 24Gb/s. If you connect that (singly or via daisy chaining) to one or more shelves, then that 24Gb/s is shared by however many drives are hanging off it. (45 in your original proposal) If you have four ports, you've got 16 sas...
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    EMC KTN-STL3 15 bay chassis

    that card has 8 channels across the two ports, so 48Gb/s. If you only use one port you're still at 24Gb/s aggregate capacity. You can choke it artificially if you create pools that manage to use only one channel, but if you're using everything, you'll see much more than 6Gb/s. You're likely to...
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    EMC KTN-STL3 15 bay chassis

    unless you've got monetary issues with downtime I wouldn't go for multipathing, especially with a copy on write filesystem. And if I did have hefty SLA's, I go for clustering first since you cover the server going down in addition to the data path. get rid of the HBA to top shelf link as well...
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    EMC KTN-STL3 15 bay chassis

    unless you've got software that support multi-pathing, the right side of the connection tree is pointless. The Cards will say in their literature something like "Supports up to 254 devices" or some such, which means keep adding shelves up to that point, after which that's what you'd use the...
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    SAS3 HBA Trim Support Without DRAT RZAT Requirement

    lots of these drives are used in non zfs applications (netapp or SAN's in general) where they are dumb, and most were probably intended to sit behind raid controllers rather than software control. May also be much more relevant to block level storage rather than file level, but that's my...
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    SAS3 HBA Trim Support Without DRAT RZAT Requirement

    for an individual drive, it's irrelevant. I believe it relates to patrol reads/scrubs on arrays where the file system will complain of an error if it compares blocks from different drives. If the blocks are free, they should all have the same 'data' right! Once a block is marked free for use (ie...
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    [Help Request] LSI 9211-8i Sas Card

    art of server (youtube) has a video or two about how to do it, notably on the 2x2 port cards built with a pcie switch cards. The process is identical for the single cpu cards like yours. Additionally, he notes common issues with a port not working - some seem to be related to simple card...
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    Guide: Flashing H310/H710/H810 Mini & full size to IT Mode

    i used an ordinary pc, but had to use the 5/6 pin tape trick to avoid boot looping
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    raidz1 hotspare question/enlightenment

    my only situation for using a hot spare instead of a parity drive is to cover multiple vdevs. In a 25 bay disk shelf for example, I'm running 3x 8disk Z2 vdevs and the last slot is a hot spare which can be used in the event of a failure in any of the three vdevs. No point having a fifth wheel...
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    EMC KTN-STL3 15 bay chassis

    I use full depth rack shelves rather than rails, mostly two units per shelf, but I use three supports on each side of the shelf rather than just one on each end as is usual. I wouldn't trust a cantilevered shelf with these either.
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    EMC KTN-STL3 15 bay chassis

    I've never heard of 64kB sector sizes for drives. Doesn't mean they don't exist, just that i'm unfamiliar with them. The sector size is the physical minimum storage unit on the disk. A cluster or block size is one to many multiples of the sector size, and those should be dependent on the data...
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    EMC KTN-STL3 15 bay chassis

    blue light? isn't that just power to the shelf? The caddies just have yellow/green lights (don't trust me here; i'm colourblind) They do make specific sata caddies - don't know if the interposer part number is the same as the sas unit though. Also something to consider is that i've not tried 4k...
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    Connectx-3 dual QSFP card - setup as 8 SFP+ switch?

    from the link above it appears as though you can use a breakout cable, but only one of the four outputs is usable, which explains post #4
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    EMC KTN-STL3 15 bay chassis

    they have been in my experience, but i've not mixed sas and sata together in the same enclosure/array. as for noise, i find them quite quiet compared to the 1U and 2U servers they're next to. There is obvious fan noise but it's not crazy like the servers.
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    sg_format fails on HGST HUSMM1640ASS201

    The datasheet for these suggests that the end 1 code is an encrypted drive I've observed in the past a pile of...
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    Help with LSI card in HP server, not reading disks

    Sorry i can't help. I've only seen that PCI error when trying to get into the card configuration utility. If you don't boot from it does it work fine? Perhaps try Truenas installed on a USB stick if you don't have any spare real drives/ports available. If it does, i'd suggest the bootloader...
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    Some thing in TrueNAS are truely maddening. For example

    you mean a guid/gptid rather than serial number in zpool status? find the disk from >zpool status (eg da3) then use >glabel status to find the interface the drive is connected to then > smartctl -a /dev/da3 | grep ^Serial to find the serial no of the disk