stretched cluster or not, with mon in 3 DC and osds on 2 DC

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Hi,

I'm currently reading the documentation about stretched cluster,

I would like to known if it's needed or not with this kind of 3 dc
setup:


                  3km (0.2ms) 
              DC1--------------DC2
30km(3ms)     |                 |  30km (2-3ms)
              |--------DC3------


DC1 && DC2 are near each other, small latency. (0.2ms)
DC3 is at 30km with bigger latency. (2ms)
separated links between dc with different physical path

1 monitor on each dc
osd on DC1/DC2, with size=4

Cluster is full nvme or ssd, lowest latency is required for osd
replication.

Now, I really don't known if latency monitor at DC3 could have an
impact on osd read/write latency is this monitor elected ?

vs stretched cluster with osd only use local dc monitors ?

What is the advantage of stretch cluster here ?  (with good redudant
links between sites)









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