12.04.2020 21:57, Stefan Bethke wrote:

>>> Is there a way, ideally in the loader, to tell the kernel to ignore ada1 
>>> and/or ahcich5? Or can I force ZFS some other way to ignore the disk? I do 
>>> have a spare disk I can use to replace the failed one, but I can't get the 
>>> machine into a state where I could even issue the zpool replace command.
>>
>> It depends on the HDD controller the disk is attached to. What controller 
>> and driver does it have?
> 
> This is from an identlical machine without disk issues:
> 
> # camcontrol devlist
> <ST3000DM001-1CH166 CC27>          at scbus4 target 0 lun 0 (ada0,pass0)
> <ST3000DM001-1CH166 CC27>          at scbus5 target 0 lun 0 (ada1,pass1)
> <ST3000DM001-1CH166 CC27>          at scbus6 target 0 lun 0 (ada2,pass2)
> <AHCI SGPIO Enclosure 2.00 0001>   at scbus8 target 0 lun 0 (pass3)
> # pciconf -lv
> ...
> ahci0@pci0:0:23:0:class=0x010601 card=0x088415d9 chip=0xa1028086 rev=0x31 
> hdr=0x00
>     vendor     = 'Intel Corporation'
>     device     = 'Q170/Q150/B150/H170/H110/Z170/CM236 Chipset SATA Controller 
> [AHCI Mode]'
>     class      = mass storage
>     subclass   = SATA

And your FreeBSD version?

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