Vlad, First off your cluster is rather full (80.31%). Hopefully you have hardware ordered for an expansion in the near future.
Based on your 'ceph osd tree' output, it doesn't look like the reweight-by-utilization did anything for you. That last number for each OSD is set to 1, which means it didn't reweight any of the OSDs. This is a different weight than the CRUSH weight, and something you can manually modify as well. For example you could manually tweak the weights of the fullest OSDs with: ceph osd reweight osd.23 0.95 ceph osd reweight osd.7 0.95 ceph osd reweight osd.8 0.95 Then just keep tweaking those numbers until the cluster gets an even distribution of PGs across the OSDs. The reweight-by-utilization option can help make this quicker. Your volumes pool also doesn't have a power of two for pg_num, so your PGs will have uneven sizes. Since you can't go back down to 256 PGs, you should look at gradually increasing them up to 512 PGs. There are also inconsistent PGs that you should look at repairing. It won't help you with the data distribution, but it's good cluster maintenance. Bryan From: ceph-users <[email protected]> on behalf of Vlad Blando <[email protected]> Date: Wednesday, February 17, 2016 at 5:11 PM To: ceph-users <[email protected]> Subject: [ceph-users] How to properly deal with NEAR FULL OSD >Hi This been bugging me for some time now, the distribution of data on >the OSD is not balanced so some OSD are near full, i did ceph > osd reweight-by-utilization but it not helping much. > > >[root@controller-node ~]# ceph osd tree ># id weight type name up/down reweight >-1 98.28 root default >-2 32.76 host ceph-node-1 >0 3.64 osd.0 up 1 >1 3.64 osd.1 up 1 >2 3.64 osd.2 up 1 >3 3.64 osd.3 up 1 >4 3.64 osd.4 up 1 >5 3.64 osd.5 up 1 >6 3.64 osd.6 up 1 >7 3.64 osd.7 up 1 >8 3.64 osd.8 up 1 >-3 32.76 host ceph-node-2 >9 3.64 osd.9 up 1 >10 3.64 osd.10 up 1 >11 3.64 osd.11 up 1 >12 3.64 osd.12 up 1 >13 3.64 osd.13 up 1 >14 3.64 osd.14 up 1 >15 3.64 osd.15 up 1 >16 3.64 osd.16 up 1 >17 3.64 osd.17 up 1 >-4 32.76 host ceph-node-3 >18 3.64 osd.18 up 1 >19 3.64 osd.19 up 1 >20 3.64 osd.20 up 1 >21 3.64 osd.21 up 1 >22 3.64 osd.22 up 1 >23 3.64 osd.23 up 1 >24 3.64 osd.24 up 1 >25 3.64 osd.25 up 1 >26 3.64 osd.26 up 1 >[root@controller-node ~]# > > >[root@controller-node ~]# /opt/df-osd.sh >ceph-node-1 >======================================================================= >/dev/sdb1 3.7T 2.0T 1.7T 54% /var/lib/ceph/osd/ceph-0 >/dev/sdc1 3.7T 2.7T 1.1T 72% /var/lib/ceph/osd/ceph-1 >/dev/sdd1 3.7T 3.3T 431G 89% /var/lib/ceph/osd/ceph-2 >/dev/sde1 3.7T 2.8T 879G 77% /var/lib/ceph/osd/ceph-3 >/dev/sdf1 3.7T 3.3T 379G 90% /var/lib/ceph/osd/ceph-4 >/dev/sdg1 3.7T 2.9T 762G 80% /var/lib/ceph/osd/ceph-5 >/dev/sdh1 3.7T 3.0T 733G 81% /var/lib/ceph/osd/ceph-6 >/dev/sdi1 3.7T 3.4T 284G 93% /var/lib/ceph/osd/ceph-7 >/dev/sdj1 3.7T 3.4T 342G 91% /var/lib/ceph/osd/ceph-8 >======================================================================= >ceph-node-2 >======================================================================= >/dev/sdb1 3.7T 3.1T 622G 84% /var/lib/ceph/osd/ceph-9 >/dev/sdc1 3.7T 2.7T 1.1T 72% /var/lib/ceph/osd/ceph-10 >/dev/sdd1 3.7T 3.1T 557G 86% /var/lib/ceph/osd/ceph-11 >/dev/sde1 3.7T 3.3T 392G 90% /var/lib/ceph/osd/ceph-12 >/dev/sdf1 3.7T 2.6T 1.1T 72% /var/lib/ceph/osd/ceph-13 >/dev/sdg1 3.7T 2.8T 879G 77% /var/lib/ceph/osd/ceph-14 >/dev/sdh1 3.7T 2.7T 984G 74% /var/lib/ceph/osd/ceph-15 >/dev/sdi1 3.7T 3.2T 463G 88% /var/lib/ceph/osd/ceph-16 >/dev/sdj1 3.7T 3.1T 594G 85% /var/lib/ceph/osd/ceph-17 >======================================================================= >ceph-node-3 >======================================================================= >/dev/sdb1 3.7T 2.8T 910G 76% /var/lib/ceph/osd/ceph-18 >/dev/sdc1 3.7T 2.7T 1012G 73% /var/lib/ceph/osd/ceph-19 >/dev/sdd1 3.7T 3.2T 537G 86% /var/lib/ceph/osd/ceph-20 >/dev/sde1 3.7T 3.2T 465G 88% /var/lib/ceph/osd/ceph-21 >/dev/sdf1 3.7T 3.0T 663G 83% /var/lib/ceph/osd/ceph-22 >/dev/sdg1 3.7T 3.4T 248G 94% /var/lib/ceph/osd/ceph-23 >/dev/sdh1 3.7T 2.8T 928G 76% /var/lib/ceph/osd/ceph-24 >/dev/sdi1 3.7T 2.9T 802G 79% /var/lib/ceph/osd/ceph-25 >/dev/sdj1 3.7T 2.7T 1.1T 73% /var/lib/ceph/osd/ceph-26 >======================================================================= >[root@controller-node ~]# > > > >[root@controller-node ~]# ceph health detail >HEALTH_ERR 2 pgs inconsistent; 10 near full osd(s); 2 scrub errors >pg 5.7f is active+clean+inconsistent, acting [2,12,18] >pg 5.38 is active+clean+inconsistent, acting [7,9,24] >osd.2 is near full at 88% >osd.4 is near full at 89% >osd.7 is near full at 92% >osd.8 is near full at 90% >osd.11 is near full at 85% >osd.12 is near full at 89% >osd.16 is near full at 87% >osd.20 is near full at 85% >osd.21 is near full at 87% >osd.23 is near full at 93% >2 scrub errors >[root@controller-node ~]# > >[root@controller-node ~]# ceph df >GLOBAL: > SIZE AVAIL RAW USED %RAW USED > 100553G 19796G 80757G 80.31 >POOLS: > NAME ID USED %USED OBJECTS > images 4 8680G 8.63 1111395 > volumes 5 18192G 18.09 4675359 >[root@controller-node ~]# > > >[root@controller-node ~]# ceph osd pool get images pg_num >pg_num: 1024 >[root@controller-node ~]# >[root@controller-node ~]# ceph osd pool get volumes pg_num >pg_num: 300 >[root@controller-node ~]# > > > >Thanks. > > >/Vlad ________________________________ This E-mail and any of its attachments may contain Time Warner Cable proprietary information, which is privileged, confidential, or subject to copyright belonging to Time Warner Cable. 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