Hi!
> Btw, the first interesting find: I enabled 'rbd_balance_parent_reads' on
> the clients, and single-thread reads now scale much better, I routinely get
> similar readings from a single disk doing 4k reads with 1 thread:
It seems to me that this function should not give any gain in "real" load. A bunch of read operations from different virtualisations from different virtualization nodes should already be "spread out" across all the osd.
WBR,
Fyodor.
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