[linux-lvm] using a read-only PV

[linux-lvm] using a read-only PV

[Eduard Bloch]

Hello,

is it possible to use a physical volume in read-only mode? The idea is:
put a snapshot of the PV on a CDROM. Later, build a volume group, with
this read-only volume as the first volume in the snapshot mode, and an
additional volume on the harddisk where the differences are stored.

Is a such scenario possible - or already useable?

Gruss/Regards,
Eduard.
-- 
The UNIX Guru's view of Sex:
unzip ; strip ; touch ; finger ; mount ; fsck ; more ; yes ; umount ;
sleep                                      [Hauke Heidtmann in dcoud]

Re: [linux-lvm] using a read-only PV

[Heinz J . Mauelshagen]

On Fri, Feb 22, 2002 at 11:26:51AM +0100, Eduard Bloch wrote:
> Hello,
> 
> is it possible to use a physical volume in read-only mode?

"hdparm -r 1 PhysicalVolumePath" would set the device used as a PV to
read-only mode (if supported), but that wouldn't allow LVM to work properly
because it needs to write to *all* PVs on updates.

> The idea is:
> put a snapshot of the PV on a CDROM. Later, build a volume group, with
> this read-only volume as the first volume in the snapshot mode, and an
> additional volume on the harddisk where the differences are stored.
> 
> Is a such scenario possible - or already useable?

No.

LVM needs to be enhanced to support what you want.

> 
> Gruss/Regards,
> Eduard.
> -- 
> The UNIX Guru's view of Sex:
> unzip ; strip ; touch ; finger ; mount ; fsck ; more ; yes ; umount ;
> sleep                                      [Hauke Heidtmann in dcoud]
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html

-- 

Regards,
Heinz    -- The LVM Guy --

*** Software bugs are stupid.
    Nevertheless it needs not so stupid people to solve them ***

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