[Bug 256582] ZFS unable to attach/replace disk to the mirror/raidz

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From: <bugzilla-noreply_at_freebsd.org>
Date: Fri, 18 Jun 2021 14:56:58 UTC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256582

--- Comment #12 from Alan Somers <asomers@FreeBSD.org> ---
I see the problem.  You originally built the pool with ashift=9.  But you're
trying to replace a disk with ashift=12.  If the new disk is actually 512n,
then you can still use it by setting vfs.zfs.min_auto_ashift=9.  But if the new
disk is 512e, then don't do that or your performance will suck.  Were the old
disks 512n or 512e?  You can tell by doing "geom disk list ada0" and look at
the Stripesize field.

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