Hello,
> - in 1st case (originator is "disk" node) : about 1Gbps on receiving host > - in 2nd case (originator is "diskless" node) : about 500Mbps on every of > receiving hosts > > From what I see I conclude, that in 1st case (originator is "disk" node) > the single copy of replicated data travels through network, while in 2nd > case (originator is "diskless" node) there are two copies travel through > network. > My understanding is the following... - If you have 3 nodes, 2 of them Diskful (A,B) and 1 Diskless (C), then if Primary is A or B, then there will be *one* write stream over the the network (either from A -> B or B -> A), reads will be served locally on each Diskful Primary node (if load-balancing is enabled also over the network). Node C is ignored in this case. If the Primary is the 3rd (Diskless) node (C), then there will be *two* write streams going through the network (C -> A,B) and possibly 2 read streams depending if the load-balancing option is enabled or not. This is probably the scenario you mentioned. - If you have 3 (A,B,C) nodes and all of them are Diskful, then when any of those nodes is in Primary mode there will be *two* write streams going through the network(A -> B,C or B -> A,C or C -> A,B) reads will be served locally on each Primary node (if load-balancing is enabled also over the network). This is probably the scenario that Robert mentioned. I cannot comment on multicast and if it can implemented in DRBD though... :) G.
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