Hi,
I've been using pg-upmap items both in the ceph balancer and by hand
running osdmaptool for a while now (on Ceph 12.2.13).
But I've noticed a side effect of up-map-items which can sometimes lead to
some unnecessary data movement.
My understanding is that the ceph osdmap keeps track of upmap-items that I
undo (in my case using the CERN scrip upmap-remapped.py).
These can be seen in the osdmap (or osd dump) json output. It looks, for
example, like this:
"pg_upmap_items": [
{
"pgid": "9.10",
"mappings": [
{
"from": 1761,
"to": 6
}
]
},
When upmapping pg 9.10 I first need to clear this pg_upmap_item by
executing an rm-upmap-item command:
ceph rm-pg-upmap-items 9.10
All this does is unmap the from/to osds (here from osd.6 to osd.1761) which
is sometimes not useful.
I would prefer to rather "forget" this upmap. I.e remove it permanently
from pg_upmap_items. Is there any way to do this?
Cheers,
Toms
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