<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD><TITLE>Message</TITLE> <META http-equiv=Content-Type content="text/html; charset=us-ascii"> <META content="MSHTML 6.00.2800.1170" name=GENERATOR></HEAD> <BODY> <DIV><SPAN class=744285023-13062003><FONT face=Arial size=2>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.</FONT></SPAN></DIV> <DIV><SPAN class=744285023-13062003><FONT face=Arial size=2></FONT></SPAN> </DIV> <DIV><SPAN class=744285023-13062003><FONT face=Arial size=2>Thanks,</FONT></SPAN></DIV> <DIV><SPAN class=744285023-13062003><FONT face=Arial size=2>Sean</FONT></SPAN></DIV> <DIV><SPAN class=744285023-13062003><FONT face=Arial size=2></FONT></SPAN> </DIV> <DIV><SPAN class=744285023-13062003> <DIV align=left>------------------------------------------------------------------------<BR>Sean P. Kane <A href="mailto:spkane@genomatica.com">spkane@genomatica.com</A><BR>Lead Infrastructure Architect <A href="http://www.genomatica.com/">Genomatica, Inc.</A><BR>------------------------------------------------------------------------<BR>"When we destroy something man has created we call it vandalism......<BR> When we destroy something that <A href="http://dictionary.reference.com/search?q=gaia">Gaia</A> has created we call it progress."</DIV></SPAN></DIV> <H1> </H1> <DIV><FONT face=Arial>[linux-lvm] read-only media in a LVM? </FONT></DIV> <DIV><B><FONT face=Arial>Joe Thornber </FONT></B><A title="[linux-lvm] read-only media in a LVM?" href="mailto:linux-lvm%40sistina.com"><FONT face=Arial>linux-lvm@sistina.com </FONT></A><BR><FONT face=Arial><I>Tue May 28 03:44:01 2002</I> </FONT></DIV> <DIV><FONT face=Arial></FONT> </DIV> <DIV><FONT face=Arial>Previous message: </FONT><A href="https://lists.sistina.com/pipermail/linux-lvm/2002-May/011529.html"><FONT face=Arial>[linux-lvm] read-only media in a LVM? </FONT></A></DIV> <DIV><FONT face=Arial>Next message: </FONT><A href="https://lists.sistina.com/pipermail/linux-lvm/2002-May/011528.html"><FONT face=Arial>[linux-lvm] errors compiling on redhat 7.3 </FONT></A></DIV> <DIV><FONT face=Arial><B>Messages sorted by:</B> </FONT><A href="https://lists.sistina.com/pipermail/linux-lvm/2002-May/date.html#11530"><FONT face=Arial>[ date ]</FONT></A><FONT face=Arial> </FONT><A href="https://lists.sistina.com/pipermail/linux-lvm/2002-May/thread.html#11530"><FONT face=Arial>[ thread ]</FONT></A><FONT face=Arial> </FONT><A href="https://lists.sistina.com/pipermail/linux-lvm/2002-May/subject.html#11530"><FONT face=Arial>[ subject ]</FONT></A><FONT face=Arial> </FONT><A href="https://lists.sistina.com/pipermail/linux-lvm/2002-May/author.html#11530"><FONT face=Arial>[ author ]</FONT></A><FONT face=Arial> </FONT></DIV> <DIV><FONT face=Arial> <HR> </FONT></DIV> <DIV><FONT face=Arial>On Mon, May 27, 2002 at 04:37:49PM -0700, Ami Fischman wrote:</FONT></DIV> <DIV><FONT face=Arial>></FONT><FONT face=Arial><I> Hi there,</I></FONT></DIV> <DIV><FONT face=Arial><I></I>></FONT><FONT face=Arial><I> I am wondering whether it is possible to have a read-only fs (CDROM, image,</I></FONT></DIV> <DIV><FONT face=Arial><I></I>></FONT><FONT face=Arial><I> etc) as part of an LVM-managed volume. I see references to COW</I></FONT></DIV> <DIV><FONT face=Arial><I></I>></FONT><FONT face=Arial><I> (copy-on-write, I'm hoping :)) in the kernel drivers/md/ files, but it's not</I></FONT></DIV> <DIV><FONT face=Arial><I></I>></FONT><FONT face=Arial><I> at all clear to me whether or not the current drivers can be used to</I></FONT></DIV> <DIV><FONT face=Arial><I></I>></FONT><FONT face=Arial><I> implement a "translucent" or "inheriting" file system (one where a base fs</I></FONT></DIV> <DIV><FONT face=Arial><I></I>></FONT><FONT face=Arial><I> is given, on r-o media, and changes to it get recorded on another device,</I></FONT></DIV> <DIV><FONT face=Arial><I></I>></FONT><FONT face=Arial><I> presumabely a r-w fs). Please let me know whether this is currently</I></FONT></DIV> <DIV><FONT face=Arial><I></I>></FONT><FONT face=Arial><I> possible, being planned for the future, or if I'm making no sense above &</I></FONT></DIV> <DIV><FONT face=Arial><I></I>></FONT><FONT face=Arial><I> you want me to clarify :). For a not-quite-mature example of what I'm</I></FONT></DIV> <DIV><FONT face=Arial><I></I>></FONT><FONT face=Arial><I> talking about, see translucency.sf.net.</I><EM></EM></FONT></DIV> <DIV><FONT face=Arial><EM></EM></FONT> </DIV> <DIV><FONT face=Arial><EM></EM>In fact you can do this now if you use just device-mapper/dmsetup :)</FONT></DIV> <DIV><FONT face=Arial>It's just the LVM2 tools that don't support it yet.- Joe </FONT></DIV> <DIV><FONT face=Arial></FONT> </DIV></BODY></HTML>