[Lustre-discuss] ldiskfs-ext4 interoperability question

Johann Lombardi johann.lombardi at oracle.com
Fri Oct 1 05:10:45 PDT 2010


On Thu, Sep 30, 2010 at 02:58:37PM -0500, Nirmal Seenu wrote:
> 1. Is is possible to run different versions of ldiskfs on different OSSs of the same lustre file system.

Yes.

> 2. Can I install the Lustre RPMs meant for the ext4 system on our older servers that were formatted with the older ldiskfs and expect it to work? Do I 
> have to do any ext3-ext4 conversion or equivalent to make this work?

The disk layout is compatible, so no conversion is needed.
There is just one bug which can be hit when downgrading from ext4-based
ldiskfs to ext3, see bugzilla ticket 22911 (should be fixed in 1.8.4).

HTH

Cheers,
Johann



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