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Re: [linux-lvm] Advanced Format disks mixed with regular disks?

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. 


  hdparm -I /dev/<disk>

to see more details, for example:

    Logical  Sector size:                   512 bytes
    Physical Sector size:                  4096 bytes

   # cat /sys/block/<disk>/queue/physical_block_size

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 Zak  <kzak redhat com>

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