There aren’t enough drives to split into multiple pools. Deploy 1 OSD on each of the 3.8T devices and 2 OSDs on each of the 7.6s. Or, alternately, 2 and 4. > On Jul 4, 2023, at 3:44 AM, Eneko Lacunza <elacunza@xxxxxxxxx> wrote: > > Hi, > > El 3/7/23 a las 17:27, wodel youchi escribió: >> I will be deploying a Proxmox HCI cluster with 3 nodes. Each node has 3 >> nvme disks of 3.8Tb each and a 4th nvme disk of 7.6Tb. Technically I need >> one pool. >> >> Is it good practice to use all disks to create the one pool I need, or is >> it better to create two pools, one on each group of disks? >> >> If the former is good (use all disks and create one pool), should I take >> into account the difference in disk size? >> > > What space use % do you expect? If you mix all disks in the same pool, if a 7.6TB disk fails that node's other disks will get full if use is near 60%, halting writes. > > With 2 pools, that would be "near 66%" for the 3.8T pool and no limit for 7.6TB (but in that case you'll only have 2 replicas with a disk failure). > > Another option would be 4 pools, in that case if a disk in any pool fails your VMs on that pool will continue working with only 2 replicas. > > For the "near" calculus, you must factor in nearfull and full ratios for OSDs, and also that data may be unevenly distributed among OSDs... > > The choice also will affect how well the aggregated IOPS will be spread between VMs<->disks. > > Cheers > > Eneko Lacunza > Zuzendari teknikoa | Director técnico > Binovo IT Human Project > > Tel. +34 943 569 206 | https://www.binovo.es > Astigarragako Bidea, 2 - 2º izda. Oficina 10-11, 20180 Oiartzun > > https://www.youtube.com/user/CANALBINOVO > https://www.linkedin.com/company/37269706/ > _______________________________________________ > 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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