Hi, I think what's happening is that because you have few PGs and many pools, the balancer cannot achieve a good uniform distribution. The upmap balancer works to make the PGs uniform for each pool individually -- it doesn't look at the total PGs per OSD, so perhaps with your low # PGs per pool per OSD you are just unlucky. You can use a script like this: https://github.com/cernceph/ceph-scripts/blob/master/tools/ceph-pool-pg-distribution to see the PG distribution for any given pool. E.g on one of my clusters: # ./ceph-pool-pg-distribution 38 Searching for PGs in pools: ['38'] Summary: 32 pgs on 52 osds Num OSDs with X PGs: 1: 21 2: 20 3: 9 4: 2 That shows a pretty non-uniform distribution, because this example pool id 38 has up to 4 PGs on some OSDs but 1 or 2 on most. (this is a cluster with the balancer disabled). The other explanation I can think of is that you have relatively wide EC pools and few hosts. In that case there would be very little that the balancer could do to flatten the distribution. If in doubt, please share your pool details and crush rules so we can investigate further. Cheers, Dan On Sun, Jan 31, 2021 at 5:10 PM Francois Legrand <fleg@xxxxxxxxxxxxxx> wrote: > > Hi, > > After 2 days, the recovery ended. The situation is clearly better (but > still not perfect) with 339.8 Ti available in pools (for 575.8 Ti > available in the whole cluster). > > The balancing remains not perfect (31 to 47 pgs on 8TB disks). And the > ceph osd df tree returns : > > ID CLASS WEIGHT REWEIGHT SIZE RAW USE DATA OMAP META > AVAIL %USE VAR PGS STATUS TYPE NAME > -1 1018.65833 - 466 TiB 214 TiB 214 TiB 126 GiB 609 GiB > 251 TiB 0 0 - root default > -15 465.66577 - 466 TiB 214 TiB 214 TiB 126 GiB 609 GiB > 251 TiB 46.04 1.06 - room 1222-2-10 > -3 116.41678 - 116 TiB 53 TiB 53 TiB 24 GiB 152 GiB > 64 TiB 45.45 1.05 - host lpnceph01 > 0 hdd 7.27599 1.00000 7.3 TiB 3.7 TiB 3.7 TiB 2.5 GiB 16 GiB > 3.5 TiB 51.34 1.18 38 up osd.0 > 4 hdd 7.27599 1.00000 7.3 TiB 3.2 TiB 3.2 TiB 2.4 GiB 8.7 GiB > 4.1 TiB 44.12 1.01 36 up osd.4 > 8 hdd 7.27699 1.00000 7.3 TiB 3.5 TiB 3.5 TiB 2.3 GiB 9.3 GiB > 3.7 TiB 48.52 1.12 39 up osd.8 > 12 hdd 7.27599 1.00000 7.3 TiB 3.4 TiB 3.4 TiB 2.4 GiB 9.5 GiB > 3.9 TiB 46.69 1.07 37 up osd.12 > 16 hdd 7.27599 1.00000 7.3 TiB 3.5 TiB 3.4 TiB 38 MiB 9.7 GiB > 3.8 TiB 47.49 1.09 37 up osd.16 > 20 hdd 7.27599 1.00000 7.3 TiB 3.1 TiB 3.0 TiB 2.4 GiB 8.7 GiB > 4.2 TiB 41.95 0.96 34 up osd.20 > 24 hdd 7.27599 1.00000 7.3 TiB 3.5 TiB 3.5 TiB 2.3 GiB 9.8 GiB > 3.8 TiB 48.45 1.11 38 up osd.24 > 28 hdd 7.27599 1.00000 7.3 TiB 3.0 TiB 3.0 TiB 55 MiB 8.2 GiB > 4.2 TiB 41.74 0.96 32 up osd.28 > 32 hdd 7.27599 1.00000 7.3 TiB 3.2 TiB 3.1 TiB 32 MiB 8.4 GiB > 4.1 TiB 43.33 1.00 34 up osd.32 > 36 hdd 7.27599 1.00000 7.3 TiB 3.7 TiB 3.7 TiB 2.4 GiB 11 GiB > 3.6 TiB 50.50 1.16 35 up osd.36 > 40 hdd 7.27599 1.00000 7.3 TiB 3.4 TiB 3.3 TiB 2.4 GiB 9.1 GiB > 3.9 TiB 46.15 1.06 37 up osd.40 > 44 hdd 7.27599 1.00000 7.3 TiB 3.4 TiB 3.4 TiB 2.3 GiB 9.2 GiB > 3.9 TiB 46.28 1.06 36 up osd.44 > 48 hdd 7.27599 1.00000 7.3 TiB 3.3 TiB 3.3 TiB 92 MiB 8.8 GiB > 4.0 TiB 44.88 1.03 33 up osd.48 > 52 hdd 7.27599 1.00000 7.3 TiB 3.3 TiB 3.3 TiB 2.4 GiB 9.0 GiB > 4.0 TiB 44.86 1.03 33 up osd.52 > 56 hdd 7.27599 1.00000 7.3 TiB 2.9 TiB 2.9 TiB 23 MiB 8.3 GiB > 4.4 TiB 39.79 0.92 34 up osd.56 > 60 hdd 7.27599 1.00000 7.3 TiB 3.0 TiB 3.0 TiB 40 MiB 8.3 GiB > 4.3 TiB 41.12 0.95 30 up osd.60 > -5 116.41600 - 116 TiB 54 TiB 54 TiB 30 GiB 150 GiB > 63 TiB 46.12 1.06 - host lpnceph02 > 1 hdd 7.27599 1.00000 7.3 TiB 3.2 TiB 3.2 TiB 2.2 GiB 8.9 GiB > 4.0 TiB 44.53 1.02 37 up osd.1 > 5 hdd 7.27599 1.00000 7.3 TiB 3.1 TiB 3.1 TiB 24 MiB 8.3 GiB > 4.2 TiB 42.56 0.98 34 up osd.5 > 9 hdd 7.27599 1.00000 7.3 TiB 3.8 TiB 3.8 TiB 42 MiB 11 GiB > 3.4 TiB 52.61 1.21 38 up osd.9 > 13 hdd 7.27599 1.00000 7.3 TiB 3.1 TiB 3.1 TiB 2.3 GiB 9.7 GiB > 4.2 TiB 42.89 0.99 36 up osd.13 > 17 hdd 7.27599 1.00000 7.3 TiB 3.4 TiB 3.4 TiB 2.3 GiB 9.1 GiB > 3.9 TiB 46.80 1.08 36 up osd.17 > 21 hdd 7.27599 1.00000 7.3 TiB 3.3 TiB 3.3 TiB 41 MiB 9.2 GiB > 4.0 TiB 44.90 1.03 33 up osd.21 > 25 hdd 7.27599 1.00000 7.3 TiB 3.5 TiB 3.5 TiB 2.4 GiB 9.4 GiB > 3.7 TiB 48.75 1.12 38 up osd.25 > 29 hdd 7.27599 1.00000 7.3 TiB 3.0 TiB 3.0 TiB 2.3 GiB 8.7 GiB > 4.2 TiB 41.91 0.96 34 up osd.29 > 33 hdd 7.27599 1.00000 7.3 TiB 3.4 TiB 3.4 TiB 2.3 GiB 9.4 GiB > 3.9 TiB 46.60 1.07 36 up osd.33 > 37 hdd 7.27599 1.00000 7.3 TiB 3.5 TiB 3.5 TiB 4.6 GiB 10 GiB > 3.8 TiB 47.90 1.10 34 up osd.37 > 41 hdd 7.27599 1.00000 7.3 TiB 3.3 TiB 3.3 TiB 2.2 GiB 11 GiB > 3.9 TiB 45.91 1.06 33 up osd.41 > 45 hdd 7.27599 1.00000 7.3 TiB 3.4 TiB 3.4 TiB 2.4 GiB 9.3 GiB > 3.9 TiB 46.85 1.08 35 up osd.45 > 49 hdd 7.27599 1.00000 7.3 TiB 3.3 TiB 3.3 TiB 2.3 GiB 8.9 GiB > 4.0 TiB 45.35 1.04 36 up osd.49 > 53 hdd 7.27599 1.00000 7.3 TiB 3.3 TiB 3.3 TiB 36 MiB 9.0 GiB > 4.0 TiB 44.85 1.03 33 up osd.53 > 57 hdd 7.27599 1.00000 7.3 TiB 3.3 TiB 3.3 TiB 2.3 GiB 9.0 GiB > 4.0 TiB 45.67 1.05 36 up osd.57 > 61 hdd 7.27599 1.00000 7.3 TiB 3.6 TiB 3.6 TiB 2.4 GiB 9.8 GiB > 3.7 TiB 49.75 1.14 36 up osd.61 > -9 116.41600 - 116 TiB 56 TiB 56 TiB 35 GiB 159 GiB > 61 TiB 48.03 1.10 - host lpnceph04 > 7 hdd 7.27599 1.00000 7.3 TiB 3.3 TiB 3.3 TiB 2.4 GiB 9.4 GiB > 3.9 TiB 45.96 1.06 37 up osd.7 > 11 hdd 7.27599 1.00000 7.3 TiB 3.9 TiB 3.9 TiB 4.7 GiB 11 GiB > 3.4 TiB 53.20 1.22 40 up osd.11 > 15 hdd 7.27599 1.00000 7.3 TiB 3.8 TiB 3.8 TiB 2.3 GiB 9.8 GiB > 3.5 TiB 51.84 1.19 40 up osd.15 > 27 hdd 7.27599 1.00000 7.3 TiB 3.1 TiB 3.1 TiB 2.3 GiB 8.5 GiB > 4.2 TiB 42.50 0.98 34 up osd.27 > 31 hdd 7.27599 1.00000 7.3 TiB 3.1 TiB 3.1 TiB 2.2 GiB 8.7 GiB > 4.2 TiB 42.61 0.98 35 up osd.31 > 35 hdd 7.27599 1.00000 7.3 TiB 3.5 TiB 3.5 TiB 2.3 GiB 12 GiB > 3.8 TiB 48.27 1.11 37 up osd.35 > 39 hdd 7.27599 1.00000 7.3 TiB 3.6 TiB 3.6 TiB 2.2 GiB 8.4 GiB > 3.7 TiB 49.45 1.14 36 up osd.39 > 43 hdd 7.27599 1.00000 7.3 TiB 3.3 TiB 3.3 TiB 2.4 GiB 9.4 GiB > 4.0 TiB 45.71 1.05 35 up osd.43 > 47 hdd 7.27599 1.00000 7.3 TiB 3.8 TiB 3.8 TiB 3.0 GiB 12 GiB > 3.5 TiB 52.31 1.20 41 up osd.47 > 51 hdd 7.27599 1.00000 7.3 TiB 3.4 TiB 3.3 TiB 2.3 GiB 10 GiB > 3.9 TiB 46.13 1.06 34 up osd.51 > 55 hdd 7.27599 1.00000 7.3 TiB 3.3 TiB 3.3 TiB 4.1 GiB 11 GiB > 4.0 TiB 45.71 1.05 35 up osd.55 > 59 hdd 7.27599 1.00000 7.3 TiB 3.8 TiB 3.8 TiB 2.2 GiB 10 GiB > 3.5 TiB 52.19 1.20 40 up osd.59 > 100 hdd 7.27599 1.00000 7.3 TiB 3.8 TiB 3.8 TiB 2.3 GiB 10 GiB > 3.5 TiB 52.22 1.20 39 up osd.100 > 101 hdd 7.27599 1.00000 7.3 TiB 3.3 TiB 3.3 TiB 26 MiB 9.0 GiB > 3.9 TiB 45.82 1.05 36 up osd.101 > 102 hdd 7.27599 1.00000 7.3 TiB 3.3 TiB 3.3 TiB 75 MiB 9.0 GiB > 3.9 TiB 45.79 1.05 34 up osd.102 > 105 hdd 7.27599 1.00000 7.3 TiB 3.6 TiB 3.5 TiB 57 MiB 9.9 GiB > 3.7 TiB 48.83 1.12 37 up osd.105 > -13 116.41699 - 116 TiB 52 TiB 52 TiB 37 GiB 148 GiB > 65 TiB 44.58 1.03 - host lpnceph06 > 19 hdd 7.27699 1.00000 7.3 TiB 3.3 TiB 3.3 TiB 2.2 GiB 8.8 GiB > 3.9 TiB 45.97 1.06 37 up osd.19 > 72 hdd 7.27599 1.00000 7.3 TiB 3.6 TiB 3.5 TiB 2.6 GiB 9.4 GiB > 3.7 TiB 48.84 1.12 39 up osd.72 > 74 hdd 7.27599 1.00000 7.3 TiB 3.1 TiB 3.1 TiB 2.3 GiB 8.5 GiB > 4.2 TiB 42.36 0.97 34 up osd.74 > 75 hdd 7.27599 1.00000 7.3 TiB 3.1 TiB 3.1 TiB 2.4 GiB 8.6 GiB > 4.2 TiB 42.85 0.99 36 up osd.75 > 76 hdd 7.27599 1.00000 7.3 TiB 3.1 TiB 3.1 TiB 2.9 GiB 9.9 GiB > 4.2 TiB 42.47 0.98 34 up osd.76 > 77 hdd 7.27599 1.00000 7.3 TiB 3.2 TiB 3.2 TiB 2.4 GiB 8.7 GiB > 4.1 TiB 44.34 1.02 35 up osd.77 > 78 hdd 7.27599 1.00000 7.3 TiB 3.3 TiB 3.3 TiB 4.6 GiB 12 GiB > 4.0 TiB 45.56 1.05 35 up osd.78 > 79 hdd 7.27599 1.00000 7.3 TiB 3.1 TiB 3.1 TiB 2.4 GiB 8.4 GiB > 4.2 TiB 42.94 0.99 35 up osd.79 > 80 hdd 7.27599 1.00000 7.3 TiB 3.1 TiB 3.1 TiB 2.4 GiB 8.5 GiB > 4.2 TiB 42.47 0.98 34 up osd.80 > 81 hdd 7.27599 1.00000 7.3 TiB 3.6 TiB 3.6 TiB 2.3 GiB 9.1 GiB > 3.7 TiB 48.99 1.13 38 up osd.81 > 82 hdd 7.27599 1.00000 7.3 TiB 3.0 TiB 3.0 TiB 2.3 GiB 8.5 GiB > 4.3 TiB 40.98 0.94 34 up osd.82 > 83 hdd 7.27599 1.00000 7.3 TiB 3.0 TiB 3.0 TiB 22 MiB 8.3 GiB > 4.3 TiB 41.03 0.94 33 up osd.83 > 84 hdd 7.27599 1.00000 7.3 TiB 3.7 TiB 3.7 TiB 2.4 GiB 11 GiB > 3.6 TiB 50.66 1.17 40 up osd.84 > 85 hdd 7.27599 1.00000 7.3 TiB 3.3 TiB 3.3 TiB 2.4 GiB 9.4 GiB > 4.0 TiB 45.66 1.05 34 up osd.85 > 86 hdd 7.27599 1.00000 7.3 TiB 3.1 TiB 3.1 TiB 51 MiB 8.7 GiB > 4.2 TiB 42.33 0.97 31 up osd.86 > 87 hdd 7.27599 1.00000 7.3 TiB 3.3 TiB 3.3 TiB 3.3 GiB 10 GiB > 3.9 TiB 45.77 1.05 34 up osd.87 > -16 552.99255 - 349 TiB 124 TiB 123 TiB 65 GiB 321 GiB > 225 TiB 0 0 - room 1222-SS-09 > -21 0 - 0 B 0 B 0 B 0 B 0 > B 0 B 0 0 - host lpnceph00 > -7 116.41600 - 116 TiB 60 TiB 60 TiB 35 GiB 176 GiB > 56 TiB 51.73 1.19 - host lpnceph03 > 2 hdd 7.27599 1.00000 7.3 TiB 3.3 TiB 3.3 TiB 2.4 GiB 8.9 GiB > 3.9 TiB 46.01 1.06 37 up osd.2 > 6 hdd 7.27599 1.00000 7.3 TiB 3.4 TiB 3.4 TiB 4.8 GiB 16 GiB > 3.8 TiB 47.26 1.09 37 up osd.6 > 10 hdd 7.27599 1.00000 7.3 TiB 4.3 TiB 4.2 TiB 2.4 GiB 12 GiB > 3.0 TiB 58.59 1.35 45 up osd.10 > 14 hdd 7.27599 1.00000 7.3 TiB 3.9 TiB 3.9 TiB 2.4 GiB 12 GiB > 3.4 TiB 53.62 1.23 40 up osd.14 > 18 hdd 7.27599 1.00000 7.3 TiB 4.0 TiB 4.0 TiB 3.4 GiB 12 GiB > 3.2 TiB 55.45 1.28 43 up osd.18 > 22 hdd 7.27599 1.00000 7.3 TiB 4.5 TiB 4.5 TiB 2.2 GiB 12 GiB > 2.8 TiB 61.64 1.42 46 up osd.22 > 26 hdd 7.27599 1.00000 7.3 TiB 3.7 TiB 3.7 TiB 2.3 GiB 11 GiB > 3.6 TiB 51.11 1.18 39 up osd.26 > 30 hdd 7.27599 1.00000 7.3 TiB 3.7 TiB 3.6 TiB 2.4 GiB 10 GiB > 3.6 TiB 50.23 1.16 39 up osd.30 > 34 hdd 7.27599 1.00000 7.3 TiB 4.2 TiB 4.2 TiB 59 MiB 11 GiB > 3.1 TiB 58.04 1.33 43 up osd.34 > 38 hdd 7.27599 1.00000 7.3 TiB 3.8 TiB 3.8 TiB 44 MiB 9.8 GiB > 3.5 TiB 51.86 1.19 38 up osd.38 > 42 hdd 7.27599 1.00000 7.3 TiB 3.7 TiB 3.7 TiB 2.7 GiB 11 GiB > 3.5 TiB 51.35 1.18 41 up osd.42 > 46 hdd 7.27599 1.00000 7.3 TiB 3.3 TiB 3.3 TiB 3.0 GiB 9.3 GiB > 4.0 TiB 45.60 1.05 35 up osd.46 > 50 hdd 7.27599 1.00000 7.3 TiB 3.6 TiB 3.6 TiB 2.5 GiB 11 GiB > 3.7 TiB 49.59 1.14 40 up osd.50 > 54 hdd 7.27599 1.00000 7.3 TiB 3.5 TiB 3.5 TiB 54 MiB 9.8 GiB > 3.7 TiB 48.78 1.12 35 up osd.54 > 58 hdd 7.27599 1.00000 7.3 TiB 3.7 TiB 3.7 TiB 2.3 GiB 9.7 GiB > 3.6 TiB 50.55 1.16 39 up osd.58 > 62 hdd 7.27599 1.00000 7.3 TiB 3.5 TiB 3.5 TiB 2.4 GiB 9.2 GiB > 3.8 TiB 48.00 1.10 40 up osd.62 > -11 0 - 0 B 0 B 0 B 0 B 0 > B 0 B 0 0 - host lpnceph05 > -19 87.31200 - 87 TiB 44 TiB 44 TiB 31 GiB 127 GiB > 43 TiB 50.92 1.17 - host lpnceph07 > 89 hdd 7.27599 1.00000 7.3 TiB 3.4 TiB 3.4 TiB 4.2 GiB 11 GiB > 3.9 TiB 46.67 1.07 38 up osd.89 > 90 hdd 7.27599 1.00000 7.3 TiB 3.7 TiB 3.7 TiB 2.4 GiB 9.9 GiB > 3.6 TiB 50.71 1.17 39 up osd.90 > 91 hdd 7.27599 1.00000 7.3 TiB 4.4 TiB 4.4 TiB 2.4 GiB 11 GiB > 2.9 TiB 60.10 1.38 47 up osd.91 > 92 hdd 7.27599 1.00000 7.3 TiB 3.3 TiB 3.3 TiB 4.1 GiB 11 GiB > 4.0 TiB 45.67 1.05 36 up osd.92 > 93 hdd 7.27599 1.00000 7.3 TiB 3.4 TiB 3.4 TiB 2.2 GiB 9.3 GiB > 3.9 TiB 46.63 1.07 38 up osd.93 > 94 hdd 7.27599 1.00000 7.3 TiB 3.7 TiB 3.7 TiB 2.3 GiB 9.8 GiB > 3.6 TiB 50.50 1.16 39 up osd.94 > 95 hdd 7.27599 1.00000 7.3 TiB 4.1 TiB 4.1 TiB 2.3 GiB 11 GiB > 3.2 TiB 56.33 1.30 44 up osd.95 > 97 hdd 7.27599 1.00000 7.3 TiB 3.8 TiB 3.8 TiB 2.4 GiB 10 GiB > 3.5 TiB 52.08 1.20 41 up osd.97 > 98 hdd 7.27599 1.00000 7.3 TiB 3.1 TiB 3.1 TiB 3.2 GiB 9.4 GiB > 4.2 TiB 42.94 0.99 34 up osd.98 > 99 hdd 7.27599 1.00000 7.3 TiB 3.9 TiB 3.9 TiB 2.9 GiB 12 GiB > 3.3 TiB 54.05 1.24 43 up osd.99 > 103 hdd 7.27599 1.00000 7.3 TiB 3.3 TiB 3.3 TiB 2.3 GiB 9.7 GiB > 3.9 TiB 45.87 1.06 36 up osd.103 > 104 hdd 7.27599 1.00000 7.3 TiB 4.3 TiB 4.3 TiB 56 MiB 13 GiB > 3.0 TiB 59.43 1.37 44 up osd.104 > -23 349.26453 - 349 TiB 124 TiB 123 TiB 65 GiB 321 GiB > 225 TiB 35.45 0.82 - host lpnceph09 > 3 hdd 14.55269 1.00000 15 TiB 5.3 TiB 5.3 TiB 4.0 GiB 14 GiB > 9.2 TiB 36.65 0.84 58 up osd.3 > 23 hdd 14.55269 1.00000 15 TiB 5.0 TiB 5.0 TiB 2.3 GiB 12 GiB > 9.5 TiB 34.52 0.79 55 up osd.23 > 63 hdd 14.55269 1.00000 15 TiB 5.2 TiB 5.2 TiB 2.4 GiB 13 GiB > 9.3 TiB 35.98 0.83 55 up osd.63 > 64 hdd 14.55269 1.00000 15 TiB 5.2 TiB 5.2 TiB 3.6 GiB 15 GiB > 9.3 TiB 35.81 0.82 57 up osd.64 > 65 hdd 14.55269 1.00000 15 TiB 5.7 TiB 5.7 TiB 4.6 GiB 16 GiB > 8.8 TiB 39.41 0.91 56 up osd.65 > 66 hdd 14.55269 1.00000 15 TiB 5.0 TiB 5.0 TiB 2.4 GiB 13 GiB > 9.6 TiB 34.33 0.79 55 up osd.66 > 67 hdd 14.55269 1.00000 15 TiB 5.1 TiB 5.1 TiB 2.4 GiB 13 GiB > 9.4 TiB 35.31 0.81 56 up osd.67 > 68 hdd 14.55269 1.00000 15 TiB 5.6 TiB 5.5 TiB 2.3 GiB 14 GiB > 9.0 TiB 38.24 0.88 58 up osd.68 > 69 hdd 14.55269 1.00000 15 TiB 5.9 TiB 5.8 TiB 2.3 GiB 15 GiB > 8.7 TiB 40.30 0.93 58 up osd.69 > 70 hdd 14.55269 1.00000 15 TiB 4.8 TiB 4.8 TiB 3.0 GiB 13 GiB > 9.7 TiB 33.21 0.76 51 up osd.70 > 71 hdd 14.55269 1.00000 15 TiB 5.2 TiB 5.2 TiB 2.2 GiB 13 GiB > 9.4 TiB 35.74 0.82 57 up osd.71 > 73 hdd 14.55269 1.00000 15 TiB 5.0 TiB 5.0 TiB 2.3 GiB 12 GiB > 9.6 TiB 34.24 0.79 55 up osd.73 > 88 hdd 14.55269 1.00000 15 TiB 5.0 TiB 5.0 TiB 2.3 GiB 12 GiB > 9.5 TiB 34.61 0.80 51 up osd.88 > 96 hdd 14.55269 1.00000 15 TiB 5.3 TiB 5.3 TiB 2.3 GiB 13 GiB > 9.3 TiB 36.28 0.83 56 up osd.96 > 106 hdd 14.55269 1.00000 15 TiB 4.9 TiB 4.9 TiB 2.5 GiB 13 GiB > 9.6 TiB 33.96 0.78 53 up osd.106 > 107 hdd 14.55269 1.00000 15 TiB 5.3 TiB 5.3 TiB 3.2 GiB 15 GiB > 9.3 TiB 36.28 0.83 54 up osd.107 > 108 hdd 14.55269 1.00000 15 TiB 5.0 TiB 5.0 TiB 2.3 GiB 13 GiB > 9.5 TiB 34.70 0.80 53 up osd.108 > 109 hdd 14.55269 1.00000 15 TiB 5.1 TiB 5.1 TiB 2.4 GiB 12 GiB > 9.5 TiB 34.82 0.80 52 up osd.109 > 110 hdd 14.55269 1.00000 15 TiB 5.5 TiB 5.5 TiB 2.8 GiB 16 GiB > 9.0 TiB 37.91 0.87 55 up osd.110 > 111 hdd 14.55269 1.00000 15 TiB 5.3 TiB 5.3 TiB 3.2 GiB 14 GiB > 9.3 TiB 36.35 0.84 55 up osd.111 > 112 hdd 14.55269 1.00000 15 TiB 5.0 TiB 5.0 TiB 2.9 GiB 14 GiB > 9.6 TiB 34.18 0.79 55 up osd.112 > 113 hdd 14.55269 1.00000 15 TiB 4.6 TiB 4.6 TiB 2.3 GiB 12 GiB > 10 TiB 31.47 0.72 48 up osd.113 > 114 hdd 14.55269 1.00000 15 TiB 5.0 TiB 4.9 TiB 3.3 GiB 13 GiB > 9.6 TiB 34.07 0.78 53 up osd.114 > 115 hdd 14.55269 1.00000 15 TiB 4.7 TiB 4.7 TiB 2.3 GiB 12 GiB > 9.8 TiB 32.47 0.75 51 up osd.115 > TOTAL 1019 TiB 443 TiB 441 TiB 258 GiB 1.2 TiB > 576 TiB 43.48 > MIN/MAX VAR: 0.72/1.42 STDDEV: 6.69 > > > and ceph balancer status > { > "last_optimize_duration": "0:00:02.223977", > "plans": [], > "mode": "upmap", > "active": true, > "optimize_result": "Unable to find further optimization, or pool(s) > pg_num is decreasing, or distribution is already perfect", > "last_optimize_started": "Sun Jan 31 17:07:47 2021" > } > > Can the crush rules for placement be blamed for the inequal repartition ? > > F. > > Le 29/01/2021 à 23:44, Dan van der Ster a écrit : > > Thanks, and thanks for the log file OTR which simply showed: > > > > 2021-01-29 23:17:32.567 7f6155cae700 4 mgr[balancer] prepared 0/10 changes > > > > This indeed means that balancer believes those pools are all balanced > > according to the config (which you have set to the defaults). > > > > Could you please also share the output of `ceph osd df tree` so we can > > see the distribution and OSD weights? > > > > You might need simply to decrease the upmap_max_deviation from the > > default of 5. On our clusters we do: > > > > ceph config set mgr mgr/balancer/upmap_max_deviation 1 > > > > Cheers, Dan > > > > On Fri, Jan 29, 2021 at 11:25 PM Francois Legrand <fleg@xxxxxxxxxxxxxx> wrote: > >> Hi Dan, > >> > >> Here is the output of ceph balancer status : > >> > >> /ceph balancer status// > >> //{// > >> // "last_optimize_duration": "0:00:00.074965", // > >> // "plans": [], // > >> // "mode": "upmap", // > >> // "active": true, // > >> // "optimize_result": "Unable to find further optimization, or > >> pool(s) pg_num is decreasing, or distribution is already perfect", // > >> // "last_optimize_started": "Fri Jan 29 23:13:31 2021"// > >> //}/ > >> > >> > >> F. > >> > >> Le 29/01/2021 à 10:57, Dan van der Ster a écrit : > >>> Hi Francois, > >>> > >>> What is the output of `ceph balancer status` ? > >>> Also, can you increase the debug_mgr to 4/5 then share the log file of > >>> the active mgr? > >>> > >>> Best, > >>> > >>> Dan > >>> > >>> On Fri, Jan 29, 2021 at 10:54 AM Francois Legrand <fleg@xxxxxxxxxxxxxx> wrote: > >>>> Thanks for your suggestion. I will have a look ! > >>>> > >>>> But I am a bit surprised that the "official" balancer seems so unefficient ! > >>>> > >>>> F. > >>>> > >>>> Le 28/01/2021 à 12:00, Jonas Jelten a écrit : > >>>>> Hi! > >>>>> > >>>>> We also suffer heavily from this so I wrote a custom balancer which yields much better results: > >>>>> https://github.com/TheJJ/ceph-balancer > >>>>> > >>>>> After you run it, it echoes the PG movements it suggests. You can then just run those commands the cluster will balance more. > >>>>> It's kinda work in progress, so I'm glad about your feedback. > >>>>> > >>>>> Maybe it helps you :) > >>>>> > >>>>> -- Jonas > >>>>> > >>>>> On 27/01/2021 17.15, Francois Legrand wrote: > >>>>>> Hi all, > >>>>>> I have a cluster with 116 disks (24 new disks of 16TB added in december and the rest of 8TB) running nautilus 14.2.16. > >>>>>> I moved (8 month ago) from crush_compat to upmap balancing. > >>>>>> But the cluster seems not well balanced, with a number of pgs on the 8TB disks varying from 26 to 52 ! And an occupation from 35 to 69%. > >>>>>> The recent 16 TB disks are more homogeneous with 48 to 61 pgs and space between 30 and 43%. > >>>>>> Last week, I realized that some osd were maybe not using upmap because I did a ceph osd crush weight-set ls and got (compat) as result. > >>>>>> Thus I ran a ceph osd crush weight-set rm-compat which triggered some rebalancing. Now there is no more recovery for 2 days, but the cluster is still unbalanced. > >>>>>> As far as I understand, upmap is supposed to reach an equal number of pgs on all the disks (I guess weighted by their capacity). > >>>>>> Thus I would expect more or less 30 pgs on the 8TB disks and 60 on the 16TB and around 50% usage on all. Which is not the case (by far). > >>>>>> The problem is that it impact the free available space in the pools (264Ti while there is more than 578Ti free in the cluster) because free space seems to be based on space available before the first osd will be full ! > >>>>>> Is it normal ? Did I missed something ? What could I do ? > >>>>>> > >>>>>> F. > >>>>>> _______________________________________________ > >>>>>> ceph-users mailing list -- ceph-users@xxxxxxx > >>>>>> To unsubscribe send an email to ceph-users-leave@xxxxxxx > >>>> _______________________________________________ > >>>> ceph-users mailing list -- ceph-users@xxxxxxx > >>>> To unsubscribe send an email to ceph-users-leave@xxxxxxx > >> _______________________________________________ > >> ceph-users mailing list -- ceph-users@xxxxxxx > >> To unsubscribe send an email to ceph-users-leave@xxxxxxx _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
 |