Date: Mon, 22 Aug 2011 14:40:22 +0200 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-stable@freebsd.org Subject: Re: WD Advanced Format: do I need to do something special? Message-ID: <j2tinm$unq$1@dough.gmane.org> In-Reply-To: <4E4CE199.8030104@rawbw.com> References: <4E4CD19E.5070108@rawbw.com> <20110818091727.GA61715@icarus.home.lan> <4E4CE199.8030104@rawbw.com>
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On 18/08/2011 11:55, Yuri wrote: > 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? Yes, read and write speeds on modern drives should be almost equal.
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