>> >> But this in a spec doesn't match it: >> >> size: '7000G:' >> >> This does: >> >> size: '6950G:' There definitely is some rounding within Ceph, and base 2 vs base 10 shenanigans. > > $ cephadm shell ceph-volume inventory /dev/sdc --format json | jq .sys_api.human_readable_size > "3.64 TB" Ceph like humans thinks in terms of base 2 units, e.g. GiB and TiB. Storage manufacturers are, well, mustelids and almost always express in terms of base 10 units, GB and TB, because they read as slightly higher. > > The 'size:' spec you set is in GB (only GB and MB are supported). However, ceph-volume inventory output can use other units (TB in this example). Therefore, the orchestrator first converts both values to bytes. Since the ceph-volume inventory produces a figure with only 2 decimals and the conversion uses powers of 10 (1e+9 for GB, 1e+12 for TB), the matching size here would be "size: 3640GB". This was confirmed by my testing a few months ago. > > If my understanding is correct, it may be worth adding to the doc [2] that the device size is human_readable_size in TB from ceph-volume inventory x 10 GB. Please enter a tracker ticket for this with details and tag me. Do you mean x1000 not x10? > > Regards, > Frédéric. > > [1] https://github.com/ceph/ceph/blob/main/src/python-common/ceph/deployment/drive_selection/matchers.py > [2] https://docs.ceph.com/en/latest/cephadm/services/osd/ > >> >> >>> Mvh. >>> >>> Torkil >>> >> >> -- >> Torkil Svensgaard >> Sysadmin >> MR-Forskningssektionen, afs. 714 >> DRCMR, Danish Research Centre for Magnetic Resonance >> Hvidovre Hospital >> Kettegård Allé 30 >> DK-2650 Hvidovre >> Denmark >> Tel: +45 386 22828 >> E-mail: torkil@xxxxxxxx >> _______________________________________________ >> 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
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