FreeBSD-10.3 root ZFS redux

James B. Byrne byrnejb at
Wed May 11 18:13:54 UTC 2016

On Wed, May 11, 2016 13:34, James B. Byrne wrote:
> We have eight (8) 3Tbyte drives on a system upon which I am installing
> FreeBSD.  The quest arises of whether one should simply grab all of
> the disks or partition them to reserve a spare area.  The reason put
> forth for partitioning is this statement in man zspool(8):
>     zpool replace [-f]	pool device [new_device]
> 	 Replaces old_device with new_device.  This is equivalent
>          to attaching new_device, waiting for it to resilver, and
>          then detaching old_device.
> 	 The size of new_device	must be	greater	than or	equal to
>          the minimum size of all the devices in a mirror or raidz
>          configuration.
> One can conceive of a 3Tb drive which has slightly more or fewer
> accessible sectors than its nominal size.  If the zspool incorporates
> a drive with fewer accessible sectors than average for its nominal
> size and one seeks to replace it with a similar drive that has more
> than average for the same nominal capacity then what is the result?
> Is the new drive accepted or rejected?

I managed to get this reversed in my head as I composed.  The question
is what happens when a nominally 3TB HDD is put in that has fewer
accessible sectors than a similar 3TB drive already present?

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James B. Byrne                mailto:ByrneJB at
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