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

Ami Fischman fischman at zion.bpnetworks.com
Mon May 27 18:30:02 UTC 2002

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.

  Ami Fischman, Ph.D.
  fischman at bpnetworks.com

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