[Lustre-discuss] Replacing An Existing OST with a bigger one (unsupported optional features)?!

[Alex]

[root at rs1 ~]# lfs df -h
UUID                     bytes      Used Available  Use% Mounted on
testfs-MDT0000_UUID     130.4G    460.1M    122.5G    0% /mnt/lustre[MDT:0]
testfs-OST0000_UUID      18.3G     17.4G      2.0M   94% /mnt/lustre[OST:0]
testfs-OST0001_UUID      18.3G     15.5G      2.0G   84% /mnt/lustre[OST:1]
testfs-OST0002_UUID      36.7G     15.5G     19.4G   42% /mnt/lustre[OST:2]
testfs-OST0003_UUID      36.7G     15.5G     19.4G   42% /mnt/lustre[OST:3]
filesystem summary:     110.0G     63.8G     40.7G   57% /mnt/lustre
[root at rs1 ~]#

Now, supposing that i want to REPLACE OST:0 (which is full) with a larger one 
block device and keep all data intact, i do:
1. umount /mnt/lustre on all our clients - ok
2. go to shd1 (OSS machine which is keeping hdb1 as OST:0)

[root at shd1 ~]# mount
...
/dev/hdb2 on /mnt/lustre/ost1_02 type lustre (rw,_netdev)
/dev/hdb1 on /mnt/lustre/ost1_01 type lustre (rw,_netdev)

[root at shd1 ~]# umount /dev/hdb1

[root at shd1 ~]# mount /dev/hdb1 -t ext3 /mnt/ost_old
mount: wrong fs type, bad option, bad superblock on /dev/hdb1,
       missing codepage or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so
[root at shd1 ~]#

[root at shd1 ~]# dmesg |tail -1
EXT3-fs: hdb1: couldn't mount because of unsupported optional features (40).
[root at shd1 ~]#

So, i can't mount /dev/hdb1 as EXT3, as explained on section "22.3.13 
Replacing An Existing OST or MDS" in order to migrate data from it to another 
volume!

Somebody can help me?

Regards,
Alx