On 02/14/2011 08:29 PM, yvette hirth wrote:
Mike Lovell wrote:
On 02/14/2011 12:59 PM, Dennis Jacobfeuerborn wrote:
I'm particularly worried about the networking side being a
bottleneck for the setup. I was looking into 10gbit and infiniband
equipment but they drive the cost up quite a bit and I'm not sure if
they are necessary if I can bond several 1gbit interfaces.
there are several more to read through. the basics i got from
glancing threads like these in the past is that bonding does okay for
2 interfaces but there isn't huge gains when going to 4 interfaces.
also, considering that a 4 port ethernet card is gonna cost about 200
on the cheap end and can go much higher, using a older infiniband
card or a 10gig-e card can make sense. there has been talk of
inifiniband cards that can do 10gbps for under $200 on the list but i
haven't actually done it myself. maybe someone else can chime in on
that. i've also seen 10gig-e gear for under $500.
the big cost is the switches. 10g switches, even small ones, start at
around $3k and go up from there.
for a while mellanox had a ddr ib "kit", with four or so cards, sfp's,
cables, and the switch, for around $6-7k. while that's still a big
budget bite to swallow, $7k to network 4 boxes at 20gbps is a fab deal.
for just a 2 server set up, switches aren't needed. at least not for
10gig-e. the 10gig-e nics i tried could just be used with a cable
between them and it auto-detected the crossover. i would guess
infiniband is similar. larger than 2 server set ups will require
switching and get more expensive. i was assuming that the context of the
question was just about the link for drbd between the servers and not
the connectivity to the rest of the network.
mike
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