Re: cluster network down

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Am 1. Oktober 2019 08:20:08 MESZ schrieb "Lars Täuber" <taeuber@xxxxxxx>:
>Mon, 30 Sep 2019 15:21:18 +0200
>Janne Johansson <icepic.dz@xxxxxxxxx> ==> Lars Täuber <taeuber@xxxxxxx>
>:
>> >
>> > I don't remember where I read it, but it was told that the cluster
>is
>> > migrating its complete traffic over to the public network when the
>cluster
>> > networks goes down. So this seems not to be the case?
>> >  
>> 
>> Be careful with generalizations like "when a network acts up, it will
>be
>> completely down and noticeably unreachable for all parts", since
>networks
>> can break in thousands of not-very-obvious ways which are not
>0%-vs-100%
>> but somewhere in between.
>> 
>
>Ok. I ask my question in a new way.
>What does ceph do, when I switch off all switches of the cluster
>network?
>Does ceph handle this silently without interruption? Does the heartbeat
>systems use the public network as a failover automatically?

No, you will be in big trouble if this happens as the Cluster do not know how the status of your osds is to be able to Serv your Client requests.

There is no redundant Ring used in case of a failure of your Cluster network. To David this you could use LACP.

hth
Mehmet

>
>Thanks
>Lars
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