Re: How to deal with increasing HDD sizes ? 1 OSD for 2 LVM-packed HDDs ?

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On 10/18/23 09:25, Renaud Jean Christophe Miel wrote:

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.

Robert Sander
Heinlein Consulting GmbH
Schwedter Str. 8/9b, 10119 Berlin

Tel: 030 / 405051-43
Fax: 030 / 405051-19

Amtsgericht Berlin-Charlottenburg - HRB 220009 B
Geschäftsführer: Peer Heinlein - Sitz: Berlin
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