Re: [Xen-users] NBD, GNBD, or NFS, and where to use LVM?

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

Don't use NFS as a root filesystem if you can help it - it's known to be 
problematic on Linux.

If you use *NBD, how about importing the Network block dev into dom0, then 
re-exporting as a standard virtual block dev to the guest.  That way you hide 
your storage setup from all the domUs.

There used to be a script for automatically connecting to NBDs on behalf of 
domUs at create-time - don't know if it's still there, if it works, etc but 
it might be worth a look.

Cheers,
Mark

On Thursday 06 October 2005 15:49, Steven McCoy wrote:
> A good question to see in the FAQ. I have a server running Xen with
> multiple domains, the storage is provided by a 1 TB array attached to
> another host. The array is partitioned using LVM2. What is the best or
> preferred way of running such a configuration? The possibilities include:
>
> 1. NBD to xen0, LVM2 on xen0, export volumes to xenUs.
> 2. LVM2 on storage host, NBD to each xenU.
> 3. GNBD to xen0, LVM2 on xen0, export volumes to xenUs.
> 4. LVM2 on storage host, GNBD to each xenU.
> 5. NFS from storage host to each xenU.
>
>
> I'm running OpenAFS, Hula mail, Apache and MySQL of the exported volumes,
> none requiring raw disk support.
>
> NBD would mean only one xen machine can use each device. GNBD currently
> doesn't build for Xen 2.0.7 on Gentoo, because the CMAN kernel modules
> requires 2.6.12. Unfortunately I only have 100mb network to the storage
> host, "hdparm -t" for NBD shows 8MB/s in xen0, 24MB/s on the storage host
> (its a firewire storage array).
>
> --
> Steve-o

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