Re: Set ZFS pool ashift=14 for FreeBSD root pools?

On 12/05/2026 23:52, vermaden wrote:
>> that ashift=14 will do what?
> 
> The zpool(8) command allows -o ashift=14 and properly creates such pool.
> 
> After I specified -o ashift=14 in the 'ZFS Pool Options' FreeBSD installed successfully.
> 
> ... but then zdb(8) does not work because /etc/zfs/zpool.cache is not used on boot/import ... strange.
> 
> root@ashift:~ # zdb
> libzpool: WARNING: ignoring tunable zfs_arc_max (using 154539520 instead)
> cannot open '/etc/zfs/zpool.cache': No such file or directory
> 
> ... or maybe You know other way to check it?

Try `zpool get ashift <pool>`, but all my pools show 0 (zero)

ashift=ashift
   Pool sector size exponent, to the power of 2 (internally referred
   to as ashift).  Values from 9 to 16, inclusive, are valid; also,
   the value 0 (the default) means to auto-detect using the kernel's
   block layer and a ZFS internal exception list.

Miroslav Lachman