Date: Thu, 18 Aug 2011 10:50:05 -0700 From: Yuri <yuri@rawbw.com> To: freebsd-hackers@freebsd.org Subject: ZFS installs on HD with 4k physical blocks without any warning as on 512 block size device Message-ID: <4E4D50CD.5080806@rawbw.com>
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Some latest hard drives have logical sectors of 512 byte when they actually have 4k physical sectors. Here is the document describing what to do in such case: http://ivoras.net/blog/tree/2011-01-01.freebsd-on-4k-sector-drives.html . For UFS: newfs -U -f 4096 /dev/da0 For ZFS: gnop create -S 4096 /dev/da0 && zpool create data /dev/da0.nop I am sure most people just install such hard drive without doing this and potentially get suboptimal performance since they aren't aware about this. Shouldn't UFS and ZFS drivers be able to either read the right sector size from the underlying device or at least issue a warning? Yuri
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