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

Sean P. Kane spkane at genomatica.com
Tue Jun 24 18:49:02 UTC 2003

Wolfgang, can I get your email address so that I can ask you a few
questions about this off-line?


Sean P. Kane
spkane at genomatica.com
Lead Infrastructure Architect
Genomatica, Inc.
"When we destroy something man has created we call it vandalism......
 When we destroy something that Gaia has created we call it progress."

-----Original Message-----
From: Wolfgang Weisselberg [mailto:uzx87lvfmukwc001 at sneakemail.com] 
Sent: Monday, June 23, 2003 17:35
To: linux-lvm at sistina.com
Subject: Re: [linux-lvm] read-only media in a LVM?

Sean P. Kane wrote 78 lines:

> I'd love to have a unionfs, but my understanding is that no such beast

> exists for Linux 2.4 currently

Try looking at 

Plasticfs-viewpath is basically a unionof all filesystems in the
viewpath, changes happen on the first one and a .whiteout remembers what
you deleted.  It does *not* work for root (security!!!  You do not want
root to see /tmp/login instead of /bin/login!).  Remember to set the
environment variables, e.g.

    PLASTICFS="viewpath /ramdisk /cdrom1 /cdrom2"
    /bin/bash   # or whatever program you want.

Since Plasticfs works on file-level, you should be able to mix and match
filesystems as you like.  Note however that --- since we just overload
common FS access methods --- some things might not work.

I have it in production use (for Aegis, not for cdroms).


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