<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> <HTML> <HEAD> <META NAME="GENERATOR" CONTENT="SGML-Tools 1.0.9"> <TITLE>Root RAID HOWTO cookbook: Appendix G. - linuxrc theory of operation </TITLE> <LINK HREF="Root-RAID-HOWTO-15.html" REL=next> <LINK HREF="Root-RAID-HOWTO-13.html" REL=previous> <LINK HREF="Root-RAID-HOWTO.html#toc14" REL=contents> </HEAD> <BODY> <A HREF="Root-RAID-HOWTO-15.html">Next</A> <A HREF="Root-RAID-HOWTO-13.html">Previous</A> <A HREF="Root-RAID-HOWTO.html#toc14">Contents</A> <HR> <H2><A NAME="Appendix-G"></A> <A NAME="s14">14. Appendix G. - linuxrc theory of operation </A></H2> <P>This is the complex form of the linuxrc file for root mounted raid. It must be processed with 'bash' or another shell that recognizes shell functions. <P>The advantage is that it is generic and is not dependent on startup files and parameters located in the <B>initrd</B> image. <P>A <B>Raid_Conf</B> parameter passed to <B>linuxrc</B> by the kernel at boot from lilo or loadlin contains a pointer to the boot devices and location the of initial 2 raidboot files needed by <B>linuxrc</B> (<I>raidboot.etc and raidboot.cfg placed by the shutdown script</I>). <BLOCKQUOTE> <B>raidboot.etc</B> containing the 'tar'ed files: <PRE> raid* mdtab* fstab lilo.conf ( if applicable ) </PRE> from the primary system that are transferred to the initrd <B>/etc</B>etc directory at startup. With care, this file may be edited if necessary when your system 'really' crashes. <P><B>raidboot.cfg</B> contains the name of the boot partition in use and applicable backup(s) as well as the path to the rest of the raid start up file used by <B>linuxrc</B>. This file is normally created by the shutdown file and may be created manually if necessary. <P><B>raidboot.cfg</B> is of the form, 3 lines - no comments <PRE> /dev/bootdev1 /dev/bootdev2 [/dev/bootdev3 ... and so on] raid-status/path name_of_raidX.conf_file </PRE> <BLOCKQUOTE> the <B>raid-status/path</B> does not include the name of the mountpoint <P>the <B>raidX.conf</B> filename is that one found in /etc and normally used for <B>ckraid</B> and <B>mkraid</B>. </BLOCKQUOTE> </BLOCKQUOTE> The following additional files reside on the permanent raid boot partitions. This is usually the same as above, but in emergency situations may be loaded from anywhere they are available, such as a floppy boot disk. <UL> <LI><B>raidgood.ref</B> created by the command cat /proc/mdstat | grep md0 > /{raid_status_path}/raidgood.ref <P> See the <A HREF="Root-RAID-HOWTO-4.html#modify_shutdown">shutdown scripts</A> for saving this file and the next <P> </LI> <LI><B>raidstat.ro</B> created at each shutdown by the shutdown rc file, saving the exit status of the raid array.</LI> </UL> <P> <HR> <A HREF="Root-RAID-HOWTO-15.html">Next</A> <A HREF="Root-RAID-HOWTO-13.html">Previous</A> <A HREF="Root-RAID-HOWTO.html#toc14">Contents</A> </BODY> </HTML>