[Lustre-discuss] Lustre 1.8.4 - Local mount of ost for backup purposes, fs type ldiskfs or ext4?

[Cory Spitz]

Hi.

You didn't say what your kernel version was.  Check dmesg, you'll likely
get a better reason for the failure there.  It's possible that the
force_over_8tb option is needed and not passed along appropriately.
Check out Lustre bugzilla 24432 and attachment 32731 which honors the
force_over_8tb mount option.  It'll be included in 1.8.6.

-Cory


On 05/11/2011 05:23 PM, Jeff Johnson wrote:
> Greetings,
> 
> I am doing a local mount of a >8TB ost device in a Lustre 1.8.4 
> installation. The ost was built with a backfstype of ldiskfs.
> 
> When attempting the local mount:
> 
>      mount -t ldiskfs /dev/sdc /mnt/save/ost
> 
> I get:
> 
>      mount: wrong fs type, bad option, bad superblock on /dev/sdt,
>                  missing codepage or other error
> 
> I am able to mount the same block device as ext4, just not as ldiskfs. I 
> need to be able to mount as ldiskfs to get access to the extended 
> attributes and back them up. Is this still the case with the ext4 
> extensions for Lustre 1.8.4? I am able to mount read-only as ext4 but 
> any attempt at reading the extended attributes with getfattr fails.
> 
> Thanks,
> 
> --Jeff
>