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From Len Bellemore <Len.Bellem...@ControlCircle.com>
Subject RE: Multiple Storage Interfaces
Date Tue, 02 Jul 2013 15:41:03 GMT
Hi Geoff,

Thanks for this.

So does that mean I could only have multiple Primary Storage networks and not multiple Secondary
Storage networks?  The Physical Network 'storage' maps to a Xenserver network of the same
name - My thinking is that if I create a second secondary storage volume on a different vlan,
I would have to then add in a Cloudstack Management CIDR on the new network, and then in XenServer,
ensure that both of the storage networks have the same name.

So, on Xenserver I have:
"Cloud-storage" network on Bond0+1 with IP address 192.168.10.1
"Cloud-storage" network on Bond2+3 with IP address 172.27.100.1

In Cloudstack I would have a single Physical Network called "Cloud-storage"
With the IP Range:
192.168.10.10-192.168.10.20
172.27.100.10-172.27.100.20

And then based on the IP ranges above, my SSVM would be able to talk to both secondary storage
devices in both networks.




I also thought that you could not vlan tag a storage network in XenServer, but the Administration
Guide for XenServer 6.1 seems to say otherwise:

4.3.3.3. Using VLANs with Dedicated Storage NICs
Dedicated storage NICs (also known as IP-enabled NICs or simply management interfaces) can
be configured to
use native VLAN / access mode ports as described above for management interfaces, or with
trunk ports and
XenServer VLANs as described above for virtual machines. To configure dedicated storage NICs,
see
Section 4.4.7, "Configuring a Dedicated Storage NIC"

http://support.citrix.com/servlet/KbServlet/download/32307-102-691300/reference.pdf

I'll give it a go anyway, and see what happens.

Len



-----Original Message-----
From: Geoff Higginbottom [mailto:geoff.higginbottom@shapeblue.com]
Sent: 02 July 2013 14:57
To: users@cloudstack.apache.org
Subject: RE: Multiple Storage Interfaces

Hi Len,

What you are trying to do is perfectly possible, however confusingly it has nothing to do
with the CloudStack Physical Network 'storage'.  The CloudStack Storage Network is only used
when accessing Secondary Storage, and is something which causes lots of confusion.  (re-writing
the official docs in relation to this is on my very long list of things to do)

All you need to do is create two networks mapped to two different Bonds on your XenServer
(assuming you want to use Bonding) then add a two new IPs, mapped to these networks.  As XenServer
cannot VLAN TAG the traffic for Storage or Management Networks, you will need to set the Switch
Ports to Access Ports and let your switch add the appropriate VLAN Tags.  This also highlights
the need for dedicated NICs, one for each Storage Network, which is advisable in order to
get optimum performance.  If you are using Jumbo Frames, remember to set the MTU on the Bond,
before mapping an IP to the Network.

As longs as these CIDRs are unique, and do not overlap your CloudStack Management CIDR, when
you add Primary Storage via CloudStack, your XenServers will simply use the appropriate Bond
when they communicate with the Storage.  Traffic routing is handled automatically by the XenServers
based on the destination IPs.

Regards

Geoff Higginbottom

D: +44 20 3603 0542 | S: +44 20 3603 0540 | M: +447968161581

geoff.higginbottom@shapeblue.com


-----Original Message-----
From: Len Bellemore [mailto:Len.Bellemore@ControlCircle.com]
Sent: 02 July 2013 14:02
To: users@cloudstack.apache.org
Subject: Multiple Storage Interfaces

Hi Guys,

Here's my scenario:

I am using XenServer as my hypervisor and I have two separate storage networks set up (in
Xenserver) One network set up on vlan 100, one network set up on vlan 200 Each network goes
to a separate storage device

Is it possible, when I create my Zone (advanced) to have multiple Physical Storage Networks?

Through the gui it doesn't seem to let me add multiple storage networks, but maybe through
the API?

Thanks
Len



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