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RE: [libvirt] Re: [Patch v0.4] iSCSI Multi-IQN (Libvirt Support)



> -----Original Message-----
> From: Daniel P. Berrange [mailto:berrange redhat com]
> Sent: Wednesday, November 18, 2009 3:50 PM
> To: Iyer, Shyam
> Cc: dallan redhat com; Bellad, Sudhir; libvir-list redhat com; Domsch,
> Matt; KM, Paniraja
> Subject: Re: [libvirt] Re: [Patch v0.4] iSCSI Multi-IQN (Libvirt
> Support)
> 
> On Wed, Nov 18, 2009 at 01:53:50AM +0530, Shyam_Iyer Dell com wrote:
> >
> >
> > > -----Original Message-----
> >
> > Iscsiadm's -I parameter takes iface name as the parameter value and
> not
> > the iqn name.
> >
> > So I believe this approach could be taken -
> >
> > 1) Get the iqn for the corresponding iface name using the following
> > command
> > #iscsiadm -m iface
> >
> > Example output:
> >
> > [root localhost libvirt-0.7.1-15-org]# iscsiadm -m iface
> > default tcp,default,default,unknown
> > iser iser,default,default,unknown
> > bnx2i bnx2i,default,default,unknown
> > iface1 tcp,default,default,iqn.1994-05.com.fedora:iqnBellad
> > iface3 tcp,default,default,iqn.dell
> > iface0 tcp,unknown,unknown,iqn.1994-05.com.fedora:iqnSudhir
> 
> Ah, so where does this mapping come from ? Does the administrator have
> to
> create the mapping between interfaces & iqns, or is this totally
> automatic
> somehow ?
> 

Today the iface file is created by by iscsi administrators using either
of the following methods

1) By hand by editing the iface parameters in
/var/lib/iscsi/ifaces/<iface_file>


Iface.iscsi_ifacename = <iface name>
Iface.net_ifacename = <default, eth0 etc>
Iface.hwaddress = <default, mac address etc>
Iface.transport_name = <tcp, bnx2i etc>
Iface.initiatorname = <iqn name>

2) By using iscsiadm commands like the following
# iscsiadm -m iface -I <iface_name> -o new
# iscsiadm -m iface -I iface1 --op=update -n iface.initiatorname -v
<iqnname>


We don't change the default initiatorname with libvirt/virt manager
today right ? So, we haven't added any apis to manage the iface file
name using libvirt as such.

But if required by virt-manager(to create a single window of management)
the iface file could be constructed using libvirt apis that call the
iscsiadm commands detailed in method 2)

Does that sound reasonable ?




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