On 10/18/23 09:25, Renaud Jean Christophe Miel wrote:
Hi,
Use case: * Ceph cluster with old nodes having 6TB HDDs * Add new node with new 12TB HDDs
Is it supported/recommended to pack 2 6TB HDDs handled by 2 old OSDs into 1 12TB LVM disk handled by 1 new OSD ?
The 12 TB HDD will get double the IO than one of the 6 TB HDDs. But it will still only be able to handle about 120 IOPs. This makes the newer larger HDDs a bottleneck when run in the same pool. If you are not planning to decommission the smaller HDDs it is recommended to use the larger ones in a separate pool for performance reasons. Regards -- Robert Sander Heinlein Consulting GmbH Schwedter Str. 8/9b, 10119 Berlin https://www.heinlein-support.de Tel: 030 / 405051-43 Fax: 030 / 405051-19 Amtsgericht Berlin-Charlottenburg - HRB 220009 B Geschäftsführer: Peer Heinlein - Sitz: Berlin