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From: Ivan Voras <ivoras@freebsd.org>
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Subject: Re: WD Advanced Format: do I need to do something special?
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On 19/08/2011 03:28, Yuri wrote:
> Following instructions here
> (http://ivoras.net/blog/tree/2011-01-01.freebsd-on-4k-sector-drives.html) I
> destroyed my previous ZFS pool with 512 byte sectors and did this:
> gnop create -S 4096 /dev/ad4
> zpool create mypool /dev/ad4.nop
> zpol create mypool/mydir
> zpool export mypool
> gnop destroy /dev/ad4.nop
> zpool import mypool
>
> Now this command 'zdb -C data | grep ashift' shows ashift=12 (4096 byte
> sectors).
>
> However, when I begin to copy a lot of files files into /mypool/mydir
> online radio player gets severely affected. Sound get interrupted all
> the time. Itrettuptions stop after 1-2 secs after I stop copying.
> This didn't happen with sector size 512 bytes.
>
> What is wrong?

Which version of FreeBSD are you doing this on?

Do you have any non-default tuning?