Windows Server «8» for hosters
A quick
reference for what`s new and exciting for hosters in Windows Server «8»
·
Windows
Server «8» is a cloud optimized operating system with some major enchancements
related to mobility, scalability, flexibility and highly availability
·
Support
for multi-tenancy through network virtualization which provides isolation in a
secure and reliable manner
So, we
have access to the Beta bits of Windows Server “8” now, and what`s the first
impression?
To be
honest, I have never been so excited about technology my entire life – I think.
And just
to clarify, the content provided here is basically related to private cloud,
virtualization and infrastructure in general.
If you`re
in the hosting industry, you are most likely pulling your hair once in a while
to figure out how to scale properly. One of the major concerns about cloud and
multi-tenancy is security and isolation. How can Windows Server “8” help you
with that?
·
Network
Virtualization and extensible virtual switch
What
exactly is network virtualization? In a nutshell, it makes it possible to have
several VMs with the same
IP-configuration living on the same physical network.
VMs have
so far – been tied to the network they`ve lived on. If you want your VM to access
anything on the LAN and also have access to the big great internet, you must
create a virtual switch which is bound to a physical NIC on the host. The same
still apply, of course, but the physical NIC must be patched to the correct
physical network to be able to present networking in general to the VMs. This
is not ideal at all – and not well suited for scale, since you`re most likely
to run out of available IP-addresses, have too many VLANs and so on. In Windows
Server “8”, you can have VMs can be presented for a subnet that differs from
the physical network.
So how
does this work? It’s enabled by using two IP addresses for each VM together
with a virtual subnet that indicates which virtual network the VMs belongs to.
So for
hosters, they can receive the customers VMs without having to reconfigure the
IP-settings – which is such a pain for the applications that rely on IP
configuration. This means that VMs running on-premise in a customer’s site can
be replicated (via Hyper-V Replica) to the cloud/hoster and operate as usual.
With the
new Hyper-V Extensible Switch, you can provide the required isolation for an
Infrastructure as a Service multi-tenancy by leveraging Private Virtual LANs
(PVLAN), VLAN in trunk mode, protect
against spoofing (ARP poisoning) and DHCP snooping and Router Guard (so that
VMs who pretend to be a router will not create a mess in your infrastructure).
With QoS
policies, the IaaS provides can ensure to meet the SLA based on maximum and
minimum bandwidth limits on a per VM basis.
·
Hyper-V
over SMB2
What keeps
the storage vendor up all night?
-
Windows
Server “8”.
Because of
support for file servers and storage combined with RDMA, storage spaces and
storage pools, you`ll have a budget solution for “high availability” to reduce
cost. RDMA can take care of the performance requirements if this is supported
in your environment. So in Windows Server “8”, the file server is actually
cool.
This is not a solution for a unplanned
failover, but for planned failover
·
Migration
You can
now migrate your VMs between clusters, in and out of a cluster, and between
stand-alone hosts over different subnets – with no downtime, and also do
concurrent live migrations.
Live Storage Migration will work in the same
way, and let you move storage of running VMs so that you can do maintenance on
the storage subsystem and to free up space. Your imagination is the limit here,
though the live migration requires the servers to be in the same domain. And if
that`s a limit, you`ll always have Hyper-V Replica.
A thing
that I have not tested yet is the advantages of network offloading
technologies, like SR-IOV, RSC, RDMA and RSS so that the main processor can
take care of more workloads.
·
Hyper-V
Replica
But if you`re looking for a more reliable, mobile and well suited platform for hosters and cloud, you`re at the right place.
1 comment:
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