PaulYou usually don't do that because you are supposed to use the whole disk.2018-05-10 12:31 GMT+02:00 Yi-Cian Pu <yician1000ceph@xxxxxxxxx>:Hi All,
We are wondering if there is any way to expand OSD’s capacity. We are studying about this and conducted an experiment. However, in the result, the size of expanded capacity is counted on the USED part rather than the AVAIL one. The following shows the process of our experiment:
1. We prepare a small cluster of luminous v12.2.4 and write some data into pool. The osd.1 is manually deployed and it uses a disk partition of size 100GB (the whole disk size is 320GB).
=====================================================================
[root@workstation /]# ceph osd df
ID CLASS WEIGHT REWEIGHT SIZE USE AVAIL %USE VAR PGS
0 hdd 0.28999 1.00000 297G 27062M 271G 8.89 0.67 32
1 hdd 0.09999 1.00000 100G 27062M 76361M 26.17 1.97 32
TOTAL 398G 54125M 345G 13.27
MIN/MAX VAR: 0.67/1.97 STDDEV: 9.63
=====================================================================
2. Then, we expand the disk partition used by osd.1 by the following steps:
(1) Stop osd.1 daemon
(2) Use “parted” command to expand 50GB of the disk partition.
(3) Restart osd.1 daemon
3. After we do the above steps, we have the result that the expanded size is counted on USED part.
=====================================================================
[root@workstation /]# ceph osd df
ID CLASS WEIGHT REWEIGHT SIZE USE AVAIL %USE VAR PGS
0 hdd 0.28999 1.00000 297G 27063M 271G 8.89 0.39 32
1 hdd 0.09999 1.00000 150G 78263M 76360M 50.62 2.21 32
TOTAL 448G 102G 345G 22.94
MIN/MAX VAR: 0.39/2.21 STDDEV: 21.95
=====================================================================
This is what we have tried, and the result looks very confusing. We’d really want to
know if there is any way to normally expand OSD’s capacity. Any feedback or suggestions would be much appreciated.
Regards,
Yi-Cian
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