On Mon, 6 Oct 2014 09:17:03 +0000 Carl-Johan Schenström wrote: > Christian Balzer <chibi@xxxxxxx> wrote: > > > Any decent switch with LACP will do really. > > And with that I mean Cisco, Brocade etc. > > > > But that won't give you redundancy if a switch fails, see below. > > > > TRILL ( http://en.wikipedia.org/wiki/TRILL_(computing) ) based switches > > (we have some Brocade VDX ones) have the advantage that they can do > > LACP over 2 switches. > [snip!] > > Meaning you can get full speed if both switches are running and still > > get redundancy (at half speed) if one goes down. > > They are probably too pricey in a 1GB/s environment though, but that's > > for you to investigate and decide. > > > > Otherwise you'd wind up with something like 2 normal switches and half > > your possible speed as one link is always just standby. > > I might be mentioning the obvious, but some (most? all?) stacked > switches allow bonding of ports on different physical switches in the > group with LACP. Redundancy is provided by the stacking platform. Your > total bandwidth is of course limited by the stacking interconnect. > They probably do (as in most), but of course you tend to pay for that pleasure as well in addition to locking yourself into a specific platform. I don't have the hard numbers right now, but the "real" network guy picked the individual VDX switches for a reason over a stacked solution. ^^ > We use a stacked pair of Dell Powerconnect 6248's with the 2*12 Gb/s > interconnect and single 10 GbE links, with 1 GbE failovers using Linux > bonding active/backup mode, to the four OSD nodes. > Looking up the spacs for that one... Ah yes, we had a bit more far ranging needs with our switches, including more 10GbE ports. ^^ Christian -- Christian Balzer Network/Systems Engineer chibi@xxxxxxx Global OnLine Japan/Fusion Communications http://www.gol.com/ _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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