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<p>Hi Gianni,<br>
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<div class="moz-cite-prefix">On 08.04.2020 17:38, Gianni Milo wrote:<br>
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<blockquote type="cite"
cite="mid:CACzVk9UiLd-=_xhpNHauz5n2we7VsOG2yUrBDg6vRzYHFt5BsQ@mail.gmail.com">
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<div class="gmail_quote">My understanding is the following...<br>
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- 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.<br>
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.</div>
<div><br>
- 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.<br>
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<p><br>
Exactly. This is why multicast propagation, which can decrease PPS
twice [on particular node], can be kind of a silver bullet :-)</p>
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<pre class="moz-signature" cols="72">--
Volodymyr Litovka
"Vision without Execution is Hallucination." -- Thomas Edison</pre>
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