On Friday, August 19, 2011 12:15:30 PM Tom Evans wrote: > On Thu, Aug 18, 2011 at 6:50 PM, Yuri <y...@rawbw.com> wrote: > > 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 > > The device never reports the actual sector size, so unless FreeBSD > keeps a database of 4k sector hard drives that report as 512 byte > sector hard drives, there is nothing that can be done. > > Cheers > > Tom
In -current at least there is a quirk table for these drives - the stripe size is set to 4K. Other tools use this size to align stuff on. Also, the default fragment size of UFS was increased to 4K. - Pieter _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
