Hi
Have been thinking a bit about rocksdb and EC pools:
Since a RADOS object written to a EC(k+m) pool is split into several
minor pieces, then the OSD will receive many more smaller objects,
compared to the amount it would receive in a replicated setup.
This must mean that the rocksdb will also need to handle this more
entries, and will grow faster. This will have an impact when using
bluestore for slow HDD with DB on SSD drives, where the faster growing
rocksdb might result in spillover to slow store - if not taken into
consideration when designing the disk layout.
Are my thoughts on the right track or am I missing something?
Has somebody done any measurement on rocksdb growth, comparing replica
vs EC ?
If you want to be not affected on spillover of block.db - use 3/30/300
GB partition for your block.db.
k
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