Thanks for this thread, it’s been really useful. I might have misunderstood, but does min_size=2 also mean that writes have to wait for at least 2 OSDs to have data written before the write is confirmed? I always assumed this would have a noticeable effect on performance and so left it at 1. Our use case is RBDs being exported as iSCSI for ESXi. OSDs are journalled on enterprise SSDs, servers are linked with 10Gb, and we’re generally getting very acceptable speeds. Any idea as to how upping min_size to 2 might affect things, or should we just try it and see? Oliver. |
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