Hi,
I'm trying to understand the "ceph health mute" behavior. In this
case, I'm referring to the warning PG_NOT_DEEP_SCRUBBED. If you mute
it for a week and the cluster continues deep-scrubbing, the "mute"
will clear at some point although there are still PGs not
deep-scrubbed in time warnings. I could verify this in a tiny lab with
19.2.2, setting osd_deep_scrub_interval to 10 minutes, the warning
pops up. Then I mute that warning, issue deep-scrubs for several
pools, and at some point I see this in the mon log:
Jun 25 08:53:28 host1 ceph-mon[823315]: log_channel(cluster) log [WRN]
: Health check update: 61 pgs not deep-scrubbed in time
(PG_NOT_DEEP_SCRUBBED)
Jun 25 08:53:28 host1 ceph-mon[823315]: Health check update: 61 pgs
not deep-scrubbed in time (PG_NOT_DEEP_SCRUBBED)
Jun 25 08:53:29 host1 ceph-mon[823315]: pgmap v164176: 389 pgs: 389
active+clean; 428 MiB data, 57 GiB used, 279 GiB / 336 GiB avail
...
Jun 25 08:53:31 host1 ceph-mon[823315]: log_channel(cluster) log [INF]
: Health alert mute PG_NOT_DEEP_SCRUBBED cleared (count increased from
60 to 61)
Jun 25 08:53:31 host1 ceph-mon[823315]: Health alert mute
PG_NOT_DEEP_SCRUBBED cleared (count increased from 60 to 61)
I don't really understand what the code does [0] (I'm not a dev):
---snip---
if (!p->second.sticky) {
auto q = all.checks.find(p->first);
if (q == all.checks.end()) {
mon.clog->info() << "Health alert mute " << p->first
<< " cleared (health alert cleared)";
p = pending_mutes.erase(p);
changed = true;
continue;
}
if (p->second.count) {
// count-based mute
if (q->second.count > p->second.count) {
mon.clog->info() << "Health alert mute " << p->first
<< " cleared (count increased from " <<
p->second.count
<< " to " << q->second.count << ")";
p = pending_mutes.erase(p);
changed = true;
continue;
---snip---
Could anyone shed some light what I'm not understanding? Why would the
mute clear although there are still PGs not deep-scrubbed?
Thanks!
Eugen
[0]
https://github.com/ceph/ceph/blob/d78ffd1247d6cef5cbd829e77204185dc0d3a8ba/src/mon/HealthMonitor.cc#L431
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