[Lustre-discuss] ldiskfs for MDT and zfs for OSTs?

[Dilger, Andreas]

In theory this should be possible, but we have not tested this for a long time since it isn't a configuration that is common. 

Note that you need to configure the OST on a separate node from the MDT in this case. We have not implemented the ability to have multiple OSD types on the same node. I don't recall the details if why this won't work, but it doesn't. 

Cheers, Andreas

On 2013-10-07, at 4:10, "Anjana Kar" <kar at psc.edu> wrote:

> Is it possible to configure the MDT as ldiskfs and the OSTs with zfs
> in lustre 2.4? The server is running a lustre kernel on a Centos 6.4
> system, has both lustre-osd-ldiskfs and lustre-osd-zfs rpms installed.
> The MDT is up as ldiskfs, but get an error trying to configure the ost:
> 
> mkfs.lustre --fsname=lustrefs --reformat --ost --backfstype=zfs .....
> 
> mkfs.lustre FATAL: unable to prepare backend (22)
> mkfs.lustre: exiting with 22 (Invalid argument)
> 
> Thanks,
> -Anjana Kar
> _______________________________________________
> Lustre-discuss mailing list
> Lustre-discuss at lists.lustre.org
> http://lists.lustre.org/mailman/listinfo/lustre-discuss