Re: Recognition Of Linux LVMs

On Mon, Aug 7, 2023 at 12:20 PM Jay F. Shachter <jay@m5.chicago.il.us>
wrote:

>
> >
> > As the primary author of OpenBSD's current fdisk/disklabel/etc. I
> > was intrigued by your recent email to misc@ .... [I]f you want
> > disklabel(8) to say "Linux LVM" for sd0l you would need at a minimum
> > a patch to /usr/src/sys/sys/disklabel.h to add an FS_LINUXLVM define
> > and the string "Linux LVM" to the immediately following
> > fstypenames[] array....
> >
>
> Please forgive me for being unclear.
>
> I was not asking whether my Linux volume group could be recognized by
> the OpenBSD "disklabel" program as a Linux volume group, and correctly
> identified as such. That would certainly be nice, and a welcome
> improvement to the disklabel program, but it was not what I was
> asking. I was asking whether Linux logical volumes can be recognized
> as disk devices by the OpenBSD kernel, in the way that they can be
> recognized in NetBSD, and in FreeBSD. Thus, if I have a multiboot
> computer, on which Linux, FreeBSD, and NetBSD have been installed, and
> if, on the Linux system, I create a volume group named "vgname", and I
> then create within that volume group a logical volume named "lvname",
> then, on the NetBSD system, I can access this logical volume by using
> the exact same names that are used on Linux: either /dev/vgname/lvname,
> or /dev/mapper/vgname-lvname. On FreeBSD the device name is slightly
> different, on FreeBSD you say /dev/linux_lvm/vgname-lvname, but in
> either case the logical volume is visible. My question for this
> mailing list was: Are Linux logical volumes visible, or can they be
> made visible, on an OpenBSD system?
>
> I have already remarked that my Solaris, Linux, FreeBSD, and NetBSD
> systems can share disk storage (e.g., the /home/jay directory) by
> means of a ZFS pool, but that OpenBSD cannot, because OpenBSD does not
> support ZFS, and that, therefore, installing an OpenBSD system on the
> same hardware will require some duplication of otherwise shared disk
> storage (and I wonder, parenthetically, why FreeBSD and NetBSD are
> willing to support ZFS, but OpenBSD is not).
>

Stuart already told you this:

"Not likely to happen.

Even if there was an implementation written, patents are involved (use is
granted via the CDDL but that's not an acceptable license for OpenBSD)."