Thanks! Rethinking same first example I think it is doable even like shown there. Nothing prevents mapping osds to host-like entities whatever they are called. 2013/6/20 Gregory Farnum <greg@xxxxxxxxxxx>: > On Thursday, June 20, 2013, Edward Huyer wrote: >> >> > Hi, >> > >> > I am thinking how to make ceph with 2 pools - fast and slow. >> > Plan is to use SSDs and SATAs(or SAS) in the same hosts and define pools >> > that >> > use fast and slow disks accordingly. Later it would be easy to grow >> > either pool >> > by need. >> > >> > I found example for CRUSH map that does similar thing by defining 2 root >> > hierarchies where hosts are used in steps >> > http://ceph.com/docs/master/rados/operations/crush-map/ (see "Placing >> > Different Pools on Different OSDS") >> > >> > but if 2 types of disks are in same hosts it will not work. >> > >> > How to do this? Do I have to define some fake entity in crushmap to make >> > 2 >> > pools work on same hardware? >> >> If I'm reading the documentation correctly, you probably have to run two >> (software) clusters. Ceph is capable of running multiple clusters on the >> same hardware. >> >> http://ceph.com/docs/master/rados/configuration/ceph-conf/#running-multiple-clusters > > > You definitely don't need to create two clusters. You will need to create > two parallel hierarchies in the CRUSH map, though -- one for "fast" and one > for "slow". Just incorporate the proper disks in each. > -Greg > > > -- > Software Engineer #42 @ http://inktank.com | http://ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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