From: Phillip Susi <psusi@cfl.rr.com>
To: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Greg Freemyer <greg.freemyer@gmail.com>,
Bill Davidsen <davidsen@tmr.com>, Florian Kusche <flox@kusche.de>,
linux-raid@vger.kernel.org
Subject: Re: Questions about 4k sector drives
Date: Tue, 4 May 2010 09:24:42 -0400 [thread overview]
Message-ID: <4BE0201A.6080101@cfl.rr.com> (raw)
In-Reply-To: <yq17hnkpw7v.fsf@sermon.lab.mkp.net>
On 5/3/2010 4:27 PM, Martin K. Petersen wrote:
> We have means of obtaining alignment and physical sector size
> information from both SCSI and ATA drives. But only if the drive
> firmware provides the information, of course.
How? I don't see any such information in the output of hdparm -I for
instance.
> One currently shipping drive model on the market isn't reporting the
> bigger physical block size. But there are several other 4KB sector
> products out there that are working just fine.
The WD drive indeed reports a 512 byte sector size, but I also have an
SSD with a 512kb erase block size and it seems like these knobs were
intended to cover that as well, but again, the values exported by the
kernel in /sys are 0 and I don't see a way for the drive to report this
information to the kernel.
next prev parent reply other threads:[~2010-05-04 13:24 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-25 11:45 Questions about 4k sector drives Florian Kusche
2010-04-25 14:43 ` Phillip Susi
2010-05-02 23:04 ` Bill Davidsen
2010-05-03 5:54 ` Luca Berra
2010-05-03 13:17 ` Phillip Susi
2010-05-03 13:30 ` Greg Freemyer
2010-05-03 13:38 ` Phillip Susi
2010-05-03 20:27 ` Martin K. Petersen
2010-05-04 13:24 ` Phillip Susi [this message]
2010-05-04 15:29 ` Martin K. Petersen
2010-05-05 7:44 ` John Robinson
2010-05-05 7:47 ` Mikael Abrahamsson
2010-05-10 17:13 ` Bill Davidsen
2010-05-03 20:19 ` Martin K. Petersen
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