[linux-lvm] read-only media in a LVM?

[Sean P. Kane]

I saw this email below and was wondering if this is supported in both dm
and the LVM2 tools now. I am trying to setup a bootable cd, that can be
written to during that session and this would be a god send, since as
the last person points out there really isn't a mature way to do this in
the 2.4/2.5 kernels. 2.6 is suppose to have a unionfs sometime after
release, but this is an immediate project.
 
Thanks,
Sean
 
------------------------------------------------------------------------
Sean P. Kane
spkane at genomatica.com
Lead Infrastructure Architect
Genomatica, Inc. <http://www.genomatica.com/> 
------------------------------------------------------------------------
"When we destroy something man has created we call it vandalism......
 When we destroy something that Gaia
<http://dictionary.reference.com/search?q=gaia>  has created we call it
progress."

 

[linux-lvm] read-only media in a LVM? 
Joe Thornber linux-lvm at sistina.com <mailto:linux-lvm%40sistina.com> 
Tue May 28 03:44:01 2002 
 
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On Mon, May 27, 2002 at 04:37:49PM -0700, Ami Fischman wrote:
> Hi there,
> I am wondering whether it is possible to have a read-only fs (CDROM,
image,
> etc) as part of an LVM-managed volume. I see references to COW
> (copy-on-write, I'm hoping :)) in the kernel drivers/md/ files, but
it's not
> at all clear to me whether or not the current drivers can be used to
> implement a "translucent" or "inheriting" file system (one where a
base fs
> is given, on r-o media, and changes to it get recorded on another
device,
> presumabely a r-w fs). Please let me know whether this is currently
> possible, being planned for the future, or if I'm making no sense
above &
> you want me to clarify :). For a not-quite-mature example of what I'm
> talking about, see translucency.sf.net.
 
In fact you can do this now if you use just device-mapper/dmsetup :)
It's just the LVM2 tools that don't support it yet.- Joe 
 
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