Date: Thu, 18 Aug 2011 02:55:37 -0700 From: Yuri <yuri@rawbw.com> To: Jeremy Chadwick <freebsd@jdc.parodius.com> Cc: freebsd-stable@freebsd.org Subject: Re: WD Advanced Format: do I need to do something special? Message-ID: <4E4CE199.8030104@rawbw.com> In-Reply-To: <20110818091727.GA61715@icarus.home.lan> References: <4E4CD19E.5070108@rawbw.com> <20110818091727.GA61715@icarus.home.lan>
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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
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