Re: [Xen-users] xen and iscsi

[Christian Schneider <christian.schneider@xxxxxxxxxxxxxxx>]

Thank You guys.

My solution:

1. Boot hypervisor

2. Mount one big iscsi volume manually on the hypervisor

iscsiadm -m node -T iqn.2016-12.blubb:$disk -p freenas-test --login  as sdX

3. Do LVM on sdX

4 Use xen-create-image with lvm as storage backend



On 12.12.2016 14:48, James Dingwall wrote:
> On Mon, Dec 12, 2016 at 08:30:59AM -0500, Austin S. Hemmelgarn wrote:
> > On 2016-12-11 14:39, Christian Schneider wrote:
> > > Hey,
> > >
> > > I want to use Xen with iscsi as storage backend (FreeNAS). My problem is
> > > that I cannot find any information about how to configure a domU to use it.
> > >
> > > I am looking for something like:
> > >
> > > disk        = [
> > >
> > >                  'iscsi:???, xvda1, w'
> > >
> > >                 ]
> > >
> > >
> > > Is this possible?
> > As far as I know, no (at least, not for PV domains, it might work for
> > HVM domains), but there are two pretty easy solutions:
> > 1. Configure Domain-0 (or possibly a storage stub-domain) to connect to
> > the iSCSI devices, then point Xen at the local device nodes.  This has
> > some slight efficiency issues because of Domain-0 needing to do two
> > translations (iSCSI to local-block, then local-block to Xen), but is
> > easy to set up and doesn't need the user domains to even support iSCSI.
> > 2. Configure the user domains to use the iSCSI devices directly.  This
> > is the more efficient option, but is not quite as easy to do, especially
> > for PV domains.
> Not that I use it but the default xen install has a block-iscsi script in 
> /etc/xen/scripts and that shows the
> syntax for the disk = [] section:
>
>    script=block-iscsi,vdev=xvda,target=iqn=<iqn>,portal=<portal IP>
>
> If you use this the iscsi device will be connected in dom0 and be passed 
> through as a normal block device.  If
> you want the iscsi connection to be directly to the domU for pv you will need a 
> kernel and initrd which can
> initiate the networking and connect the target in the initrd or for hvm you 
> could use a pxe environment which
> can do that.
>
> Regards,
> James

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