On Wed, May 10, 2017 at 01:13:37PM +0200, Bernd wrote: > Hello, > > when using local lvm2 logical volumes for OpenStack Nova ephemeral pool > then the created logical volumes are linear (not striped) and what is worse > than that, all volumes are allocated on the same first physical volume > (until it is filled up). > > I made a ServerFault question about that: > > https://serverfault.com/questions/849088/automatically-distribute-lvm-stripes-for-specific-lvm2-vg-on-linux/849255#849255 > > It was suggested that raid_stripe_all_devices should help (to turn on > striping by default), but it did not. So I went ahead and patched the > lvm.py of nova to turn the striping on. However I still wonder if there is > a lvm option (allocation policy for that). > > Besides that, it looks like it is still creating the first stripe on the > first device. It would make more sense to have it (even in the linear case) > to round robin the LVs. Because first of all it might be the most busy part > of the volume and secondly it helps for keeping room for expanding volumes. > > Is there anything planned in this direction? If you're concerned with placement of LVs on PVs, I'd probably skip striping and add some logic specifying different PVs directly: lvcreate -n name -L size VG PV ... means the LV will be created using only the specified PVs. _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
