linux-ext4 - Re: I/O topology fixes for big physical block size

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Date:	Mon, 27 Sep 2010 19:15:52 -0400
From:	Mike Snitzer <snitzer@...hat.com>
To:	"Martin K. Petersen" <martin.petersen@...cle.com>
Cc:	Jens Axboe <jaxboe@...ionio.com>,
	"James.Bottomley@...senpartnership.com" 
	<James.Bottomley@...senpartnership.com>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	linux-ext4@...r.kernel.org
Subject: Re: I/O topology fixes for big physical block size

On Mon, Sep 27 2010 at  6:36pm -0400,
Martin K. Petersen <martin.petersen@...cle.com> wrote:

> >>>>> "Jens" == Jens Axboe <jaxboe@...ionio.com> writes:
> Jens> Does mkfs do the right thing?
> 
> Depends on which mkfs it is. Mike has tested things and can chip in
> here...

I haven't test all mkfs.* but...

mkfs.xfs just works with 1M physical_block_size.

mkfs.ext4 won't by default but -F "fixes" that:

# mkfs.ext4 -b 4096 -F /dev/mapper/20017380023360006
mke2fs 1.41.12 (17-May-2010)
Warning: specified blocksize 4096 is less than device physical sectorsize 1048576, forced to continue
...

I'll check fdisk and parted tomorrow (I know lvm2 doesn't look at
physical_block_size).
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