On 02/14/2011 12:59 PM, Dennis Jacobfeuerborn wrote:
I'm trying to wrap my head around storage setups that might work for
virtualization and I wonder if people here have experience with
creating a drbd setup for this purpose.
What I am currently planning to implement is this:
2 Storage 8-bay nodes with 8gb RAM and a dual-core Xeon processor.
Each system with gets equipped with 8 1TB SATA drives in a raid-5
configuration.
Networking will either be two dual-port cards or two quad-core cards
which I plan to setup as bonded interfaces (balance-xor).
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.
Any thoughts?
performance over bonded gig-e links has been talked about a few times in
the past. seems like there is the discussion brought up regularly. here
are links to the beginnings of 2 threads.
http://lists.linbit.com/pipermail/drbd-user/2010-May/014113.html
http://lists.linbit.com/pipermail/drbd-user/2010-September/014848.html
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.
hope that provides some help.
mike
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