Re: md raid6: slow resync if fs is mounted rw

On Wed, Feb 26, 2014 at 3:31 AM, Brad Campbell
[off-list ref] wrote:

You are probably expeririencing an effect of this :

http://www.thomas-krenn.com/en/wiki/Ext4_Filesystem#Lazy_Initialization

That's it. ext4lazyinit shows up in the blktrace and also flashes up
every now and then in iotop - I did not notice it before.
I reformatted with "mkfs.ext4 -E
lazy_itable_init=0,lazy_journal_init=0" and the issue is gone. Of
course, just waiting a bit with the filesystem mounted rw would have
done it, too.

Thanks a lot Neil and Brad!
Jakob