On 3/17/21 7:44 AM, Janne Johansson wrote:
Den ons 17 mars 2021 kl 02:04 skrev Tony Liu <tonyliu0592@xxxxxxxxxxx>:
What's the purpose of "cluster" network, simply increasing total
bandwidth or for some isolations?
Not having client traffic (that only occurs on the public network)
fight over bandwidth with OSD<->OSD traffic (replication and
recovery).
Now, this wasn't as much of an issue, which is why most have stopped
recommending split networks and just go with bonding the interfaces
and let the side that currently needs a lot of BW get it.
It does have another drawback: when public network is up, but one
cluster network port(-channel) is down (or one of the routers for
cluster network), clients can do IO to all OSDs, but not all OSDs can
communicate, and you will get slow ops, OSDs flagging each other down
and that might not be obvious to spot.
Gr. Stefan
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