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

Mike Snitzer
2010-09-27T23:15:57Z

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

> >>>>> "Jens" == Jens Axboe <jaxboe@fusionio.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).