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4 or 8 PGs doesn't provide much parallelism at baseline. Start with 16 and set the floor there; that's a more reasonable number of OSDs that will be put to work on a single pool. Note that there is no magic number here. At some point someone has to tell Ceph if an empty pool should get lots of PGs across lots of devices to get the full throughput of the cluster. But this will be a bit less painful/surprising for users. Fixes: https://tracker.ceph.com/issues/42509 Signed-off-by: Sage Weil <sage@redhat.com> |
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