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

[Wojciech Turek]

Alex wrote:
> [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 ~]#
>   
Try  mount -t ldiskfs /dev/hdb1 /mnt/ost_old
> [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
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