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To: Jeremy Chadwick <freebsd@jdc.parodius.com>
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Cc: freebsd-stable@freebsd.org
Subject: Re: WD Advanced Format: do I need to do something special?
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On 08/18/2011 02:17, Jeremy Chadwick wrote:
> The below advice still applies.  Do not skim the page, read it.
>
> http://ivoras.net/blog/tree/2011-01-01.freebsd-on-4k-sector-drives.html
>
> You will therefore have to go through some manual rigmarole (preferably
> with gpart(8)) to ensure performance.  If you plan on using the disks in
> ZFS, you get to go through some extra rigmarole.

I didn't know about such extra actions that are required and just 
created ZFS pool.
zdb -C <mypool> shows ashift as 9. I read it as meaning that sector size 
if 512bytes (wrong!).

But I tested the 25GB file writing/reading speed on the middle tracks 
and it seems reasonable:
WR 55MB/s
RD 107MB/s

So can I get even better speeds if it was aware of 4k sector?

Yuri