Is not there a way to Deal with this kind of setup when playing with the "weight" of an OSD? I dont mean the "crush weight". I am in a Situation where i had to Think about to add a Server with 24 x 2TB disks - my other osd nodes has 12 x 4TB. Which is in Sum 48TB per node in both situations. Am 31. März 2020 18:10:24 MESZ schrieb Anthony D'Atri <aad@xxxxxxxxxxxxxx>: >You can adjust the Primary Affinity down on the larger drives so >they’ll get less read load. In one test I’ve seen this result in a >10-15% increase in read throughout but it depends on your situation. > >Optimal settings would require calculations that make my head hurt, >maybe someone has a tool but I haven’t seen it. > >You might want to ensure that the drives are spread evenly across your >(unspecified) failure domains so that the extra capacity isn’t wasted, >again depending on your topology. > > >> On Mar 31, 2020, at 8:49 AM, Eneko Lacunza <elacunza@xxxxxxxxx> >wrote: >> >> Hi Andras, >> >>> El 31/3/20 a las 16:42, Andras Pataki escribió: >>> I'm looking for some advice on what to do about drives of different >sizes in the same cluster. >>> >>> We have so far kept the drive sizes consistent on our main ceph >cluster (using 8TB drives). We're getting some new hardware with >larger, 12TB drives next, and I'm pondering on how best to configure >them. If I just simply add them, they will have 1.5x the data (which >is less of a problem), but will also get 1.5x the iops - so I presume >it will slow the whole cluster down as a result (these drives will be >busy, and the rest will not be as much). I'm wondering how people >generally handle this. >>> >>> I'm more concerned about these larger drives being busier than the >rest - so I'd like to be able to put for example 1/3 drive of less >accessed data on them in addition to the usual data - to use the extra >capacity but not increase the load on them. Is there an easy way to >accomplish this? One possibility is to run two OSDs on the drive (in >two crush hierarchies), which isn't ideal. Can I just run one OSD >somehow and put it into two crush roots, or something similar? >> You should adjust the weight of the new 12TB disk OSDs, to match the >weight of the current 8TB OSDs. >> >> That will make the new disks the same as the old disks to Ceph :-) >But you'll lost the extra 4TB space, until you remove the 8TB disks >from the cluster... >> >> Cheers >> Eneko >> >> -- >> Zuzendari Teknikoa / Director Técnico >> Binovo IT Human Project, S.L. >> Telf. 943569206 >> Astigarragako bidea 2, 2º izq. oficina 11; 20180 Oiartzun (Gipuzkoa) >> www.binovo.es >> _______________________________________________ >> 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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