alignment of metadata 1.2 and mkfs.ext4

["Tyler J. Wagner" <tyler@tolaris.com>]

Hi all (well, Neil, really),

The the following, Neil states that that is no issue with alignment of
metadata 1.2 and mkfs.ext4 on 4K drives:

http://www.issociate.de/board/post/507176/filesystem_on_mdadm_raid_from_unpartioned_block_devices.html

Sorry to ask again, but I just want to clarify. Metadata 1.2 puts the
data 4K from the start of the device/partition. Does mkfs put the start
of the filesystem at 64K from the start? IE, will the following align,
without any need for options?

(create partitions starting 2048 512-byte sectors from start = 1MB)
mdadm --create /dev/md0 -v --raid-devices=4 --level=raid10
--metadata=1.2 /dev/sda1 /dev/sdb1 /dev/sdc1 /dev/sdd1
mkfs.ext4 /dev/md0

And, slightly off-topic, it's not necessary to define stride and stripe
any longer?
mkfs.ext4 -E stride=16,stripe-width=32 /dev/md0

Regards,
Tyler


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