On Thu, Mar 17, 2011 at 06:47:18PM -0500, Ron Johnson wrote: > On 03/16/2011 07:39 PM, Martin K. Petersen wrote: >>>>>>> "Phillip" == Phillip Susi<psusi@cfl.rr.com> writes: >> >> Phillip> The kernel has the ability to read it from the drive and report >> Phillip> it to the user space tools, which have been patched to use it, >> Phillip> but the WD EARS drives lie and claim 512/512 instead of >> Phillip> 512/4096. >> >> The saving grace is that modern util-linux/dm tooling aligns on 1MB by >> default instead of sector 63. >> > > So, given the correct options ( -c -b 4096 ), v2.17.2 will handle the 2TB > WD Caviar Green WD20EARS drives which I just bought for my external > backup device... Right? The -b option is usually unnecessary (for v2.17 is the -c enough). It seems (according to feedback from users) that newer WDxxEARS disks are already fixed. http://community.wdc.com/t5/Desktop/Problem-with-WD-Advanced-Format-drive-in-LINUX-WD15EARS/m-p/20675#M1245 Try hdparm -I /dev/<disk> to see more details, for example: Logical Sector size: 512 bytes Physical Sector size: 4096 bytes and # cat /sys/block/<disk>/queue/physical_block_size 4096 It's also better to update to util-linux v2.18 or v2.19 where all the new features are enabled by default (so -c is unnecessary too). Karel -- Karel Zak <kzak@redhat.com> http://karelzak.blogspot.com _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
