It's mostly about bandwidth. With VLANs, the public and cluster networks are going to be sharing the inter-switch links.
For a cluster that size, I don't see much advantage to the VLANs. You'll save a few ports by having the inter-switch links shared, at the expense of contention on those links. If you're trying to save ports, I'd go with a single network. Adding a cluster network later is relatively straight forward. Just monitor the bandwidth on the inter-switch links, and plan to expand when you saturate those links. That said, I am using VLANs, but my cluster is much smaller. I only have 5 nodes and a single switch. I'm planning to transition to a dedicated cluster switch when I need the extra ports. I don't anticipate the transition being difficult. I'll continue to use the same VLAN on the dedicated switch, just to make the migration less complicated. On Tue, Nov 25, 2014 at 3:11 AM, Sreenath BH <bhsreen...@gmail.com> wrote: > Hi > For a large network (say 100 servers and 2500 disks), are there any > strong advantages to using separate switch and physical network > instead of VLAN? > > Also, how difficult it would be to switch from a VLAN to using > separate switches later? > > -Sreenath > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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