Status of support for 4KB disk sectors

Kevin Oberman kob6558 at
Tue Jul 19 21:33:28 UTC 2011

On Tue, Jul 19, 2011 at 1:41 PM, Alexander Leidinger
<Alexander at> wrote:
> On Mon, 18 Jul 2011 16:41:24 -0700 Jeremy Chadwick
> <freebsd at> wrote:
>> But the currently "known method" is to use gnop(8).  Here's an
>> example:
>> Now, that's for ZFS, but I'm under the impression the exact same is
>> needed for FFS/UFS.
> Info: gnop will not work for FFS/UFS because gnop is a temporary
> solution (needs to be done by hand at each reboot). For FFS/UFS you
> need to align the slice/partition and chose a good blocksize/fragsize
> combination (e.g. 32k/4k).
> Bye,
> Alexander.
> --
>    Alexander @ PGP ID = B0063FE7
>       netchild @  : PGP ID = 72077137

Thanks, Alexander.

This is what I had expected after reading the man pages, though I
would think -b 65560 -f 8192' would be a bit more reasonable in this
day of bloated file formats. it's been years since I have hit a
problem with lack of inodes. Probably around 1993 on an old
SparcStation 1 running SunOS and then only due to a bad assumption I
made when 'newfs'ing it.

Again, thanks for the advice. At very least it will save me a bit of time!
R. Kevin Oberman, Network Engineer - Retired
E-mail: kob6558 at

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