[Libguestfs] [PATCH 4/5] daemon: lvm: list PVs/VGs/LVs with --foreign
Pino Toscano
ptoscano at redhat.com
Tue Jul 26 16:47:06 UTC 2016
On Tuesday, 26 July 2016 16:59:34 CEST Richard W.M. Jones wrote:
> On Tue, Jul 26, 2016 at 05:41:28PM +0200, Pino Toscano wrote:
> > The appliance has no LVM system ID set, which means that lvm commands
> > will ignore VGs with a system ID set to anything. Since we want to work
> > with them, pass --foreign at least when listing them to see them.
> >
> > See also lvmsystemid(7).
>
> This is sort of a hack, if I'm understanding correctly.
Yes and no -- it's the only way we can deal with VGs with any system ID
set (which currently are not seen at all).
> Can we not instead give the appliance a "system ID"?
This would be problematic, since new VGs would take the system ID of
the appliance, making them tied to that specific ID; on the other hand,
creating a VG from a LVM with no system ID set means it will be seen on
any LVM, regardless of their system ID.
> Also, lvm(8) says:
>
> --foreign
> Cause the command to access foreign VGs, that would otherwise be
> skipped. It can be used to report or display a VG that is owned
> by another host. This option can cause a command to perform
> poorly because lvmetad caching is not used and metadata is read
> from disks.
>
> which sounds bad.
No solution about this yet.
--
Pino Toscano
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