[linux-lvm] Got only half the space of RAID10 LV with 4 PVs (similar to RAID1 cause LV shows it has 4 'Mirrored volumes')

[Douglas Paul]

[ Reposting to list for completeness --- the servers seem sick and are
delaying posts by up to 16h ! ]

On Wed, Jul 18, 2018 at 10:41:14PM +0800, runappz wrote:
> Thank you for clarifying it sir. Then  for `-l 8` I expect all 
> `lvolX_rimage_N`s has 4 extents rather than 8:
> 
>        --- Segments ---
>        Logical extents 0 to 7:
>          Type        raid10
>          Monitoring        monitored
>          Raid Data LV 0
>            Logical volume    lvol5_rimage_0
>            Logical extents    0 to 7
>          Raid Data LV 1
>            Logical volume    lvol5_rimage_1
>            Logical extents    0 to 7
>        ...

I believe that those are the logical extents that are involved in those
stripes. All of the logical extents will store some data in each of the
slices.

Try "lvs -a" to see the actual space on disk used by each of the segments.

-- 
Douglas Paul