On 31/07/12 01:46, Josh Durgin wrote:
So here two questions:
1. Should I increase number of PGs in rbd pool or better leave it where
it is?
It would be better to increase it from a data balancing point of view,
but it's not clear that it would help performance.
I would care about data balancing first - as I said it is currently
skewed a bit. Performance wise perhaps it will take a bit more
CPU/memory to process but not to the extent where it will affect
performance.
2. Wiki says that increase in PGs is not tested and only should be
attempted on empty pool. Date on Wiki is quite old. Is this still an
issue? Is it safe to increase PGs number on 0.49 on pool in use?
Right now the number of pgs in a pool can't be increased. This should
be possible in a couple months. If you can stop I/O to the current pool,
you can create a new one with more pgs, copy all the data to it, delete
the original and rename the new one.
Then I am stuck with current number of PGs: pool is in heavy use and
there virtually no chance to increase PGs number offline. Will wait for
a version which will make it possible.
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