Hi John,

Comments inline.

On 14-Jun-2014, at 4:08 am, John Muckley <j.muck...@databax.com> wrote:

> Hi all,
>
> Can someone give me an overview of how the NFS storage works? Like what 
> servers should have an NFS share mounted once a zone is enabled?

There is no requirement to “manually” mount primary or secondary
storage. CloudStack would do the mount automatically as per your
zone configuration settings.


> I’m using NFS for my secondary storage.

The SSVM would mount your secondary storage over NFS.

> During deployment I mount the nfs share as /mnt/secondary and seed the 
> template to the secondary storage.
> This works fine, If I log onto my NFS server, I can see the ‘template’ folder 
> appears and contains the template. All is good at this point.

Ok. This is about the only “manual” mount you require before
the Zone is enabled. Once the seeding is complete, the mgmt
server no longer requires the NFS mount.


> The installation guide goes on to say…
>
> “If you are using a separate NFS server, perform this step. If you are using 
> the Management
> Server as the NFS server, you MUST NOT perform this step.
> When the script has finished, unmount secondary storage and remove the 
> created directory.
> # umount /mnt/secondary
> # rmdir /mnt/secondary”

Ok.


> As I am indeed using a separate NFS server, I go ahead and unmount the NFS 
> share and remove the mount point from the management server.
>
> When I create my zone through the UI, I add the NFS share details in to the 
> secondary storage bit and it accepts it and adds the secondary storage, but 
> once my zone is enabled, the system VMs do not come up and I cannot see the 
> NFS share mounted on either of my hosts nor on the management server.

This is most likely to be a incorrect configuration issue that prevents
CloudStack from spinning off the system VMs.

Have you had a chance to check the management server logs?


> I kind of assumed that the management-server would mount this NFS share on 
> the appropriate hosts and anywhere else it is required once the zone is 
> enabled, but this doesn’t seem to happen.
>

Yeah, CloudStack would mount the NFS share on one of the hosts and
then create the SSVM. There are many things that can go wrong here
but usually its an Incorrect network configuration like label mismatch,
NFS permissions etc

> Has anyone else experienced this?

SSVM not spinning up is the #1 FAQ actually and the usual answer is
“Have you checked your management server logs?". :)

Hth

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