In this case the root cause was half denied reservations.
http://tracker.ceph.com/issues/9626
This stopped backfills since, those listed as backfilling were
actually half denied and doing nothing. The toofull status is not
checked until a free backfill slot happens, so everything was just
stuck.
Interestingly, the toofull was created by other backfills which were
not stoppped.
http://tracker.ceph.com/issues/9594
Quite the log jam to clear.
Quoting Craig Lewis <clewis@xxxxxxxxxxxxxxxxxx>:
What was the osd_backfill_full_ratio? That's the config that controls
backfill_toofull. By default, it's 85%. The mon_osd_*_ratio affect the
ceph status.
I've noticed that it takes a while for backfilling to restart after
changing osd_backfill_full_ratio. Backfilling usually restarts for me in
10-15 minutes. Some PGs will stay in that state until the cluster is
nearly done recoverying.
I've only seen backfill_toofull happen after the OSD exceeds the ratio (so
it's reactive, no proactive). Mine usually happen when I'm rebalancing a
nearfull cluster, and an OSD backfills itself toofull.
On Mon, Jan 5, 2015 at 11:32 AM, c3 <ceph-users@xxxxxxxxxx> wrote:
Hi,
I am wondering how a PG gets marked backfill_toofull.
I reweighted several OSDs using ceph osd crush reweight. As expected, PG
began moving around (backfilling).
Some PGs got marked +backfilling (~10), some +wait_backfill (~100).
But some are marked +backfill_toofull. My OSDs are between 25% and 72%
full.
Looking at ceph pg dump, I can find the backfill_toofull PGs and verified
the OSDs involved are less than 72% full.
Do backfill reservations include a size? Are these OSDs projected to be
toofull, once the current backfilling complete? Some of the
backfill_toofull and backfilling point to the same OSDs.
I did adjust the full ratios, but that did not change the backfill_toofull
status.
ceph tell mon.\* injectargs '--mon_osd_full_ratio 0.95'
ceph tell osd.\* injectargs '--osd_backfill_full_ratio 0.92'
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