Re: Working ZFS RAID/SAS controller support/mpii

[Peter Kay <syllopsium%syllopsium.co.uk@localhost>]

On Wed, 15 Jul 2020 at 09:59, Sad Clouds <cryintothebluesky%gmail.com@localhost> wrote:
>
> On Wed, 15 Jul 2020 00:20:33 +0100
> Peter Kay <syllopsium%syllopsium.co.uk@localhost> wrote:
>
> > Configuration : Boot drive on SATA, other drives on LSI 3008 8i SAS in
> > JBOD, boot ROM disabled. The mpii driver gets very upset (causes a
> > kernel panic on boot, even though the boot drive is on SATA [1]) if
> > some of the drive bays aren't occupied, throws unhappy messages about
> > drives disappearing from bays, and generally doesn't provide any
> > confidence that I could ever remove a drive from a running system and
> > have it work.
>
> So the issue only happens when you remove drives from a live system? If
> that's the case, the obvious workaround would be to power off the
> system and then replace faulty drive.
No, it also causes a problem if the system is booted up from cold with
drives missing/in a different order than before (the boot drive still
being in the same location). It'd be nice to have the ability to hot
swap, but if it was a cold boot only issue for failed drives that
would be ok.

> There is LSI binary Linux command line tool (MegaCli64), so I imagine
> you could offline/online individual disks, but you'd need Linux
> emulation packages setup on NetBSD.
Interesting, thank you.