Hi, We run few hundred HDD OSDs for our backup cluster, we set one RAID 0 per HDD in order to be able to use -battery protected- write cache from the RAID controller. It really improves performance, for both bluestore and filestore OSDs. We also avoid expanders as we had bad experiences with them. Xavier -----Mensaje original----- De: ceph-users <ceph-users-bounces@xxxxxxxxxxxxxx> En nombre de Simon Ironside Enviado el: jueves, 25 de julio de 2019 0:38 Para: ceph-users@xxxxxxxxxxxxxx Asunto: Re: New best practices for osds??? RAID0 mode being discussed here means several RAID0 "arrays", each with a single physical disk as a member of it. I.e. the number of OSDs is the same whether in RAID0 or JBOD mode. E.g. 12x physicals disks = 12x RAID0 single disk "arrays" or 12x JBOD physical disks = 12x OSDs. Simon On 24/07/2019 23:14, solarflow99 wrote: > I can't understand how using RAID0 is better than JBOD, considering > jbod would be many individual disks, each used as OSDs, instead of a > single big one used as a single OSD. > _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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