On Wed, 09 May 2018 20:46:19 +0000 Gandalf Corvotempesta wrote: > As subject, what would happen ? > This cosmic imbalance would clearly lead to the end of the universe. Seriously, think it through, what do you _think_ will happen? Depending on the actual networks in question, the configuration and capabilities of your servers/OSDs and your clients the answer for a typical use case may be "nothing much". Though a slower cluster network usually implies higher latencies and _that_ part would hurt you more for smallish IOPS than any bandwidth differences. Again, you need to be more specific to get useful answers here. For example a cluster with nodes that have 8 HDDs, a 10Gb/s cluster and a 25Gb/s public network. A single node can't even saturate the cluster network so the "nothing much" answer applies. If you change the speeds to 1Gb/s and 10Gb/s respectively you're now limited to the 100MB/s speed of the cluster network during large writes and recovery/rebalancing traffic. But with a typical VMs on RBD use case you're unlikely to run into that limitation and will be more hobbled by the significantly larger latencies introduced by the 1Gb/s links. Lastly, more often than not segregated networks are not needed, add unnecessary complexity and the resources spent on them would be better used to have just one fast and redundant network instead. Christian -- Christian Balzer Network/Systems Engineer chibi@xxxxxxx Rakuten Communications _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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