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Hello, I’m trying to find a way to determine real/physical/raw storage capacity usage when storing a similar set of objects in different pools, for example a 3-way replicated pool vs. a 4+2 erasure coded pool, and
in particular how this ratio changes from small (where Bluestore block size matters more) to large object sizes. I find that ceph df detail and
rados df don’t report on really-raw storage, I guess because they’re perceiving ‘raw’ storage from their perspective only. If I write a set of objects to each pool, rados df shows the space used as the summation of the logical size of the objects, while
ceph df detail shows the raw used storage as the object size * the redundancy factor (e.g. 3 for 3-way replication and 1.5 for 4+2 erasure code). Any suggestions? Jody Glider, Principal Storage Architect Cloud Architecture and Engineering, SAP Labs LLC 3412 Hillview Ave (PAL 02 23.357), Palo Alto, CA 94304 E j.glider@xxxxxxx, T +1 650-320-3306, M +1 650-441-0241 |
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