Hi Stefan,
thank you for help. Looks very interesting and command you sent helps to
have better insight on that. Still wandering why some of OSDs keeps
primary for more PGs as others. I was thinking that balancer and CRUSH
should take care of that.
I will try balancer you sent a link for and will post result. But this
will take more time as first I have to test it on some non-production Ceph.
Thx!
On 11/9/22 08:20, Stefan Kooman wrote:
On 11/1/22 13:45, Denis Polom wrote:
Hi
I observed on my Ceph cluster running latest Pacific that same size
OSDs are utilized differently even if balancer is running and reports
status as perfectly balanced.
That might be true because the primary PGs are not evenly balanced.
You can check that with: ceph pg dump. The last output is the overview
for how many PGs an OSD is primary for. To get more detail by pool you
can run this (source: unknown, but it works :-)):
"ceph pg dump | awk '
BEGIN { IGNORECASE = 1 }
/^PG_STAT/ { col=1; while($col!="UP") {col++}; col++ }
/^[0-9a-f]+\.[0-9a-f]+/ { match($0,/^[0-9a-f]+/); pool=substr($0,
RSTART, RLENGTH); poollist[pool]=0;
up=$col; i=0; RSTART=0; RLENGTH=0; delete osds;
while(match(up,/[0-9]+/)>0) { osds[++i]=substr(up,RSTART,RLENGTH); up
= substr(up, RSTART+RLENGTH) }
for(i in osds) {array[osds[i],pool]++; osdlist[osds[i]];}
}
END {
printf("\n");
printf("pool :\t"); for (i in poollist) printf("%s\t",i); printf("|
SUM \n");
for (i in poollist) printf("--------"); printf("----------------\n");
for (i in osdlist) { printf("osd.%i\t", i); sum=0;
for (j in poollist) { printf("%i\t", array[i,j]); sum+=array[i,j];
sumpool[j]+=array[i,j] }; printf("| %i\n",sum) }
for (i in poollist) printf("--------"); printf("----------------\n");
printf("SUM :\t"); for (i in poollist) printf("%s\t",sumpool[i]);
printf("|\n");
}'"
11/15/2022 14:35 UTC there is a talk about this: New workload balancer
in Ceph (Ceph virtual 2022).
The balancer made by Jonas Jelten works very well for us (though does
not balance primary PGs): https://github.com/TheJJ/ceph-balancer. It
outperforms the ceph-balancer module by far. And had faster
convergence. This is true up to and including octopus release.
Gr. Stefan
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