If I tweak my devstack with VOLUME_BACKING_FILE_SIZE=40G (the default is 10G), I can't reproduce even with 10 'clients' running this test. With the default 10G, I only need 3 'clients' running that tempest test concurrently.
So I think we are seeing weird things only when LVM almost runs out of space.
Now this is getting weird.
If I tweak my devstack with VOLUME_ BACKING_ FILE_SIZE= 40G (the default is 10G), I can't reproduce even with 10 'clients' running this test. With the default 10G, I only need 3 'clients' running that tempest test concurrently.
So I think we are seeing weird things only when LVM almost runs out of space.