[Ocfs2-users] lvm2 not cluster aware - okay, so how should I stripe my LUNs?

[Fabio Corazza]

Humpherys Philip D Contr 532 CMMXS/CL wrote:
> Hi, I'm testing ocfs2 in a 2-node ocfs2 cluster.  I have 12 SAN LUNs
> that I'd like to stripe and mount up as an ocfs2 filesystem.  I've been
> told that because LVM2 is not cluster aware, that it can't be used.  I'm
> trying to make mdadm work.  (using EMC powerpath for multipath).  I can
> create an md raid0 device on one node using the /dev/emcpowerxx
> pseudo-devices, and on the other node the md device is there, but it has
> scanned for the devices, and it shows the /dev/sd* devices, not the
> pseudo-devices that really need to be used for multi-path.  
> 
>  
> 
> Does anyone know how to make the other node only use the pseudo-devices
> for multi-path.  And what is recommended for RAID in ocfs2?

I don't know about RAID0 striping over emcpower* devices, but you can
use EVMS clustered within Heartbeat 2.x to stripe LUNs using LVM2
metadata (that's what I do). But this will add additional point of
failures to your system.



Regards,
Fabio