Re: [PATCH 00/18] Assorted md patches headed for 2.6.30

["jzc-sina" <jinzc@sina.com>]

hi neil:
I get your the latest patches (v2.6.29-rc5-335-g0ac4ee7) from git://neil.brown.name/md.
I want to test the function that switch raid from raid5 to raid6.
But find some problem.
I create a raid6 which has 4 disks,and write some files to this raid6 ,next,i remove two of them.
if this raid6 is ok,now i can read the files that i have written correctly.
but in fact that i can't read the files ok.maybe there is some error about raid6 in v2.6.29-rc5-335-g0ac4ee7.


Steps i have done are as follows
1, mdadm -C /dev/md6 -l 6 -n 4 /dev/sda /dev/sdb /dev/sdc /dev/sdd --metadata=1.0 --size=1000000 -f
2, pvcreate /dev/md6
3, vgcreate md6vg /dev/md6
4, lvcreate -L 200M -n md6lv md6vg
5, mkfs.xfs /dev/mapper/md6vg-md6lv
6, mount /dev/mapper/md6vg-md6lv /tmp     (is ok)

7, mdadm -f /dev/md6 /dev/sda /dev/sdb  (faulty two disks)
8, mount /dev/mapper/md6vg-md6lv /tmp   (now can't read the filesystem information correctly)
(mount: Structure needs cleaning) (print this )

thanks neil ,right here waiting for your help !

zhenchengjin