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From: Geoff Higginbottom <geoff.higginbottom@shapeblue.com>
To: "cloudstack-users@incubator.apache.org"
	<cloudstack-users@incubator.apache.org>
Subject: Storage Networks XenServer
Thread-Topic: Storage Networks XenServer
Thread-Index: Ac1QZhSxwer8LEIUTfaqPMTvPzjRjw==
Date: Fri, 22 Jun 2012 11:00:19 +0000
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Hi

I have been trying to get a system up and running using XenServer 6.0.2 wit=
h multiple physical networks, with one nic dedicated to Storage.

There seems to be a lot of contradictory info regarding the use of the stor=
age network, and whether it is for Primary or Secondary storage.

The latest admin guide for 3.0.3 states the following


Storage Network Topology Requirements
The secondary storage NFS export is mounted by the secondary storage VM. Se=
condary storage traffic goes over the management traffic network, even if t=
here is a separate storage network. Primary storage traffic goes over the s=
torage network, if available. If you choose to place secondary storage NFS =
servers on the storage network, you must make sure there is a route from th=
e management traffic network to the storage network.

And


Separate Storage Network for XenServer (Optional)

You can optionally set up a separate storage network. This should be done f=
irst on the host, before implementing the bonding steps below. This can be =
done using one or two available NICs. With two NICs bonding may be done as =
above. It is the administrator's responsibility to set up a separate storag=
e network.


Give the storage network a different name-label than what will be given for=
 other networks.

For the separate storage network to work correctly, it must be the only int=
erface that can ping the primary storage device's IP address. For example, =
if eth0 is the management network NIC, ping -I eth0 <primary storage device=
 IP> must fail. In all deployments, secondary storage devices must be pinga=
ble from the management network NIC or bond. If a secondary storage device =
has been placed on the storage network, it must also be pingable via the st=
orage network NIC or bond on the hosts as well.


I think it is pretty clear that a "Storage Network" in CloudStack is for Pr=
imary Storage, but can optionally be used for Secondary Storage.

So I have a test system with single XenServer 6.0.2 Host, with 4 physical N=
ICs, and each NIC is assigned a role with the appropriate traffic label  eg
NIC 0: Management
NIC 1: Guest
NIC 2: Public
NIC 3: Storage

The CS Management Server, Host and Secondary Storage are all on the 192.168=
.1.0/24 address range with no VLAN tagging
The Primary Storage is on the 172.16.0.0/24 address range with no VLAN tagg=
ing

Deploying a new Zone works OK, and the System VMs (SSVM and CP) come on lin=
e, however uploading templates or ISOs fails.

When I log onto the SSVM and try and ping the Secondary Storage IP (192.168=
.1.100) it fails as there is a ROUTE forcing the traffic over the Storage N=
etwork NIC which is a completely different physical network rung on IP Rang=
e 172.16.0.0.   If I manually delete the ROUTE then the SSVM can ping the S=
econdary Storage and the Templates and ISOs upload correctly.

Can someone clarify how we should be using the Storage Network ideally with=
 some detailed examples including IPs

Thanks

Geoff

ShapeBlue provides a range of strategic and technical consulting and implem=
entation services to help IT Service Providers and Enterprises to build a t=
rue IaaS compute cloud. ShapeBlue's expertise, combined with CloudStack tec=
hnology, allows IT Service Providers and Enterprises to deliver true, utili=
ty based, IaaS to the customer or end-user.

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