scan: scrub in progress since Sun Feb 22 00:03:02 2026 4.66T / 16.8T scanned at 21.8M/s, 4.65T / 16.8T issued at 21.8M/s 0B repaired, 27.63% done, 6 days 18:46:18 to go
@MagicLike interesting. how does IO look? zpool iostat -v 5
scrub does slow itself down a lot if there is competing IO on the pool. also make sure you aren't having one disk struggling, though zpool status should make that very obvious
@privateger before I make a mess here with pasting the terminal table output - all 4 disks basically have the same read I/O of ~1,5M and basically 0 write I/O
@privateger here as well I can't spot anything out of the ordinary, yes one or two disks might lag a few ms behind sometimes but there is no real pattern to it that I can spot...
@MagicLike this is abysmal speed for the given settings, which all look perfectly fine.
something aint right with the HDDs themselves here, those are random IO speeds or worse. this basically has to be connectivity issues of some kind, with scrubs nowadays generally running at sequential read speed. i dont presume you'd be using SMR drives for ZFS, so it's likely not that.
@privateger It could be that this is the built in storage controller of this HP ProLiant ML110 G7 - I recently discovered that it only gives 2 of the 4 drives a SATA 6 Gbit/s bandwidth and the rest only SATA 3 Gbit/s. Tho tbh this should not be an issue imo as the drives (Seagate Exos 7E10 8TB model ST8000NM017B) max out at 255 MB/s of max sustained I/O. I could simply try pausing and resuming the scrub, reboot ig and see if it is that and otherwise reseat the drives... But other than that I am running out of ideas.
One thing about the disk I/O: from time to time there are read spikes of around 50 MB/s before dropping down to 1,5 MB/s
@MagicLike the B110i is apparently problematic in general and sometimes chokes on larger queue depths, stalling reads before draining it (which would fit your read speed spikes) may be worth looking into an LSI HBA
@privateger yea I already am, found one that is completely overkill in terms of ports but I get the most for my money here and can reuse it once I upgrade NAS hardware in a few years - the LSI 9300-16i, which goes for 71€ on ebay refurbished
@MagicLike yeah i was gonna suggest ebay 9300 is a decent pick, but mind that those are essentially two SAS3008 controllers in one PCB and therefore use ~2x the power (~27W) and heat. the 9305-16i is the single-chip alternative that runs cooler if you care about that
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