[Ovirt-devel] Modeling LVM storage

[Steve Ofsthun]

Chris Lalancette wrote:
> sseago and I (and variously, other folks) had a somewhat longish conversation on
> IRC today about carving up storage with LVM.  This is the second time we've
> beaten this horse, so hopefully we are somewhat OK now.  The basic idea is that,
> given an iSCSI LUN (and SCSI and FC LUNs in the future), we want to either:
> 
> 1)  Assign the entire LUN to a guest (this is the way that ovirt works right now)
> 2)  Carve up the LUN using LVM, and then hand out individual logical volumes to
> guests.

How do you plan to distinguish between LVM PVs/LVs created by ovirt/libvirt on iscsi LUNs from LVM PVs/LVs created by guest OSes on directly connected iscsi LUNs?  Just blindly running pvscan will run into all sorts of trouble.

Steve