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To: Arun <engineerarun@gmail.com>
Cc: Mark Knecht <markknecht@gmail.com>,
        "Martin K. Petersen" <martin.petersen@oracle.com>,
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Subject: Re: Detection of Advanced Format drives
From: "Martin K. Petersen" <martin.petersen@oracle.com>
Organization: Oracle
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Date: Tue, 27 Sep 2011 17:44:25 -0400
In-Reply-To: <CANLaLhZZdw9Wedc39VoEvpK1Xw-EXTFPD9JXsu1nJd3s8sTb2Q@mail.gmail.com>
	(Arun's message of "Wed, 28 Sep 2011 02:42:28 +0530")
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>>>>> "Arun" == Arun  <engineerarun@gmail.com> writes:

Arun> A quick check of hdparm tells me that it is using the SG_IO ioctl
Arun> for the ATA_OP_PIDENTIFY command. Maybe I have some hopes of
Arun> having a correct result with the BLKPBSZGET ioctl. Will check that
Arun> out.

hdparm and the kernel are looking the same place for the physical block
size. There should be no discrepancy between what hdparm can see and
what's reported in physical_block_size by the kernel. The BLKPBSZGET
returns the same topology parameter as sysfs' physical_block_size.

-- 
Martin K. Petersen	Oracle Linux Engineering