On Thu, 22 Mar 2007, Peter Rabbitson wrote:
> Hi,
> How does one determine the XFS sunit and swidth sizes for a software raid10
> with 3 copies?
mkfs.xfs uses the GET_ARRAY_INFO ioctl to get the data it needs from
software raid and select an appropriate sunit/swidth...
although i'm not sure i agree entirely with its choice for raid10:
*sunit = md.chunk_size >> 9;
*swidth = *sunit * md.raid_disks;
i'd think it would depend on the layout of the raid10 (near, far,
offset)... for near2 on 4 disks i'd expect swidth to be only 2*sunit...
but for far2 on 4 disks i'd expect 4*sunit... but i'm not sure. it
probably doesn't matter.
-dean
-
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
