XFS over LVM over md RAID

[Richard Scobie]

Eric Sandeen wrote:

> yup F11 doesn't have all the nice blkid topology bits; F11 still has
> libblkid in e2fsprogs, from before it was liberated to util-linux-ng.
>
> (I wonder if we shouldn't just convert xfsprogs over to use the ioctls...)

Thanks both for your help. For various reasons, I'll just rely on using 
the non-topology aware version.

In the future this lv will be grown in multiples of  256K chunk, 16 
drive RAID6 arrays, so am I correct in thinking that the sunit/swidth 
parameter can stay the same as it is expanded?

I am thinking that XFS allocates ag's across all the space and that it 
will only be writing to any one array at a time, or would there be more 
configured if mkfs.xfs were aware that it was being created on say, 2 x 
16 RAID6 arrays?

This is based on backing up the first array prior to expansion, adding 
the second and mkfs.xfs, as I imagine just expanding the fs over the 
second would result in non optimal performance.

Regards,

Richard