Hi cephers,
I'm looking for some advice on what to do about drives of different
sizes in the same cluster.
We have so far kept the drive sizes consistent on our main ceph cluster
(using 8TB drives). We're getting some new hardware with larger, 12TB
drives next, and I'm pondering on how best to configure them. If I just
simply add them, they will have 1.5x the data (which is less of a
problem), but will also get 1.5x the iops - so I presume it will slow
the whole cluster down as a result (these drives will be busy, and the
rest will not be as much). I'm wondering how people generally handle this.
I'm more concerned about these larger drives being busier than the rest
- so I'd like to be able to put for example 1/3 drive of less accessed
data on them in addition to the usual data - to use the extra capacity
but not increase the load on them. Is there an easy way to accomplish
this? One possibility is to run two OSDs on the drive (in two crush
hierarchies), which isn't ideal. Can I just run one OSD somehow and put
it into two crush roots, or something similar?
Andras
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