[ceph-users] palcing SSDs and SATAs in same hosts
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? Ugis ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
Re: [ceph-users] palcing SSDs and SATAs in same hosts
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 ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
Re: [ceph-users] palcing SSDs and SATAs in same hosts
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@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
Re: [ceph-users] palcing SSDs and SATAs in same hosts
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 g...@inktank.com: 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@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
