Data balancing is depended on the following items: 1. osd counts, more is better, while 20 may be not enough. 2. PG counts, more is better. you can try to create a new pool with more PGs than default. 3. Object size, little is better. More objects with little size is better than less objects with big size. 4. Bucket type in the CrushMap. different bucket type means different balance algorithm. 5. Maybe other issues. You can use pg dump command to get details about object counts for each PG, this may be helpful to locate your problem. On 20 August 2014 04:43, Alphe Salas <asalas@xxxxxxxxx> wrote: > Hello, > for some reasons the balancing of disk space use on OSD is not properly > working. Can you please give me hint to solve that issue? > > it is supposed that the proper difference betwin min and max osd disk space > use, should be around 20%. > > Actually I see that it is more that 40% > > follow you will find the list of disk and real use > > osd10: Filesystem Size Used Avail Use% Mounted on > osd10: /dev/sda1 1.8T 1.1T 646G 63% /var/lib/ceph/osd/ceph-18 > osd10: Filesystem Size Used Avail Use% Mounted on > osd10: /dev/sdb1 1.8T 1.6T 109G 94% /var/lib/ceph/osd/ceph-19 > osd09: Filesystem Size Used Avail Use% Mounted on > osd09: /dev/sda1 1.8T 1.5T 216G 88% /var/lib/ceph/osd/ceph-16 > osd09: Filesystem Size Used Avail Use% Mounted on > osd09: /dev/sdb1 1.8T 895G 842G 52% /var/lib/ceph/osd/ceph-17 > osd08: Filesystem Size Used Avail Use% Mounted on > osd08: /dev/sda1 1.8T 1.6T 153G 92% /var/lib/ceph/osd/ceph-10 > osd08: Filesystem Size Used Avail Use% Mounted on > osd08: /dev/sdb1 1.8T 1.7T 84G 96% /var/lib/ceph/osd/ceph-11 > osd07: Filesystem Size Used Avail Use% Mounted on > osd07: /dev/sda1 1.8T 1.5T 297G 83% /var/lib/ceph/osd/ceph-14 > osd07: Filesystem Size Used Avail Use% Mounted on > osd07: /dev/sdb1 1.8T 1.5T 268G 85% /var/lib/ceph/osd/ceph-15 > osd06: Filesystem Size Used Avail Use% Mounted on > osd06: /dev/sda1 1.8T 1.6T 193G 89% /var/lib/ceph/osd/ceph-12 > osd06: Filesystem Size Used Avail Use% Mounted on > osd06: /dev/sdb1 1.8T 1.4T 305G 83% /var/lib/ceph/osd/ceph-13 > osd05: Filesystem Size Used Avail Use% Mounted on > osd05: /dev/sda1 1.8T 1.3T 434G 76% /var/lib/ceph/osd/ceph-8 > osd05: Filesystem Size Used Avail Use% Mounted on > osd05: /dev/sdb1 1.8T 1.2T 526G 70% /var/lib/ceph/osd/ceph-9 > osd04: Filesystem Size Used Avail Use% Mounted on > osd04: /dev/sda1 1.8T 1.6T 169G 91% /var/lib/ceph/osd/ceph-6 > osd04: Filesystem Size Used Avail Use% Mounted on > osd04: /dev/sdb1 1.8T 1.4T 313G 82% /var/lib/ceph/osd/ceph-7 > osd03: Filesystem Size Used Avail Use% Mounted on > osd03: /dev/sda1 1.8T 1.6T 195G 89% /var/lib/ceph/osd/ceph-4 > osd03: Filesystem Size Used Avail Use% Mounted on > osd03: /dev/sdb1 1.8T 1.3T 425G 76% /var/lib/ceph/osd/ceph-5 > osd02: Filesystem Size Used Avail Use% Mounted on > osd02: /dev/sda1 1.8T 1.4T 362G 80% /var/lib/ceph/osd/ceph-2 > osd02: Filesystem Size Used Avail Use% Mounted on > osd02: /dev/sdb1 1.8T 1.5T 211G 88% /var/lib/ceph/osd/ceph-3 > osd01: Filesystem Size Used Avail Use% Mounted on > osd01: /dev/sda1 1.8T 1.4T 304G 83% /var/lib/ceph/osd/ceph-0 > osd01: Filesystem Size Used Avail Use% Mounted on > osd01: /dev/sdb1 1.8T 1.3T 456G 74% /var/lib/ceph/osd/ceph-1 > > ceph health detail gives an inacurate estimation of the problem (the > percentages are wrong..) > > ceph health detail > HEALTH_WARN 4 near full osd(s) > osd.6 is near full at 85% (real 91%) > osd.10 is near full at 86% (real 92%) > osd.11 is near full at 90% (real 96%) > osd.19 is near full at 88% (real 94%) > > > Then as you can see on the above disk space use dump I get a usage span from > 52% to 96%. > > The question is how can I force the re balancing. I tryed with ceph osd > reweight-by-use 108 and still there is this amazing gap. > > actual osd tree is > > # id weight type name up/down reweight > -1 35.8 root default > -2 3.58 host osd01 > 0 1.79 osd.0 up 1 > 1 1.79 osd.1 up 0.808 > -3 3.58 host osd02 > 2 1.79 osd.2 up 0.9193 > 3 1.79 osd.3 up 1 > -4 3.58 host osd03 > 4 1.79 osd.4 up 1 > 5 1.79 osd.5 up 1 > -5 3.58 host osd04 > 6 1.79 osd.6 up 1 > 7 1.79 osd.7 up 1 > -6 3.58 host osd05 > 8 1.79 osd.8 up 0.7892 > 9 1.79 osd.9 up 0.7458 > -7 3.58 host osd08 > 10 1.79 osd.10 up 1 > 11 1.79 osd.11 up 1 > -8 3.58 host osd06 > 12 1.79 osd.12 up 1 > 13 1.79 osd.13 up 1 > -9 3.58 host osd07 > 14 1.79 osd.14 up 1 > 15 1.79 osd.15 up 1 > -10 3.58 host osd09 > 16 1.79 osd.16 up 1 > 17 1.79 osd.17 up 1 > -11 3.58 host osd10 > 18 1.79 osd.18 up 1 > 19 1.79 osd.19 up 1 > > Regards, > > > -- > Alphe Salas > I.T ingeneer > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Dong Yuan Email:yuandong1222@xxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
