[Linux-cluster] EFI in CLVM

[Alan Brown]

On 12/08/2011 17:24, Paras pradhan wrote:
> Does it mean that I don't need mpath0p1 ? If its the case i don't need 
> to run kpartx on mpath0?

You still need kpartx, but that's a bit clunky anyway. Let dm-multipath 
take care of all that for you.

(The last time I used kpartx and friends was 2003. Dm-multipath and 
multipathd are much more user-friendly. All you need then is multipath 
-v2 -ll to verify things are where they should be...)

> And not having mpath0p1 will take away this device mapper ioctl failed 
> issue when creating lvcreate?
>

I think that's a separate issue. What's the underlaying structure? SAN? 
FC? iscsi? drdb?

> I am really confused why this lock has failed , also not sure if this 
> is related to this >2TB LUN.
>

It's not. Some of my LUNs are 25+Tb

FWIW having PVs on LUN partitions introduces a small but measurable 
speed penalty over making the entire LUN a PV - this is mostly down to 
the small offset a partition table adds to the front of the LUN.