----- Le 28 Juin 24, à 15:27, Anthony D'Atri anthony.datri@xxxxxxxxx a écrit : >>> >>> 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? Of course x1000. ;-) Here's the tracker: https://tracker.ceph.com/issues/66754 Frédéric. > > >> >> 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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