[rock-user] Rock Linux 2.6 kernel and LVM2 HOWTO

1) compile kernel with option 
       Device Drivers  ---> 
           Multi-device support (RAID and LVM)  ---> 
               [*] Multiple devices driver support (RAID and LVM)      

       (CONFIG_MD=y)

2) remove LVM1
   mine -r lvm

3) get sources for device-mapper and LVM2 from the links at
    http://sources.redhat.com/dm/ and
    http://sources.redhat.com/lvm2/

4) configure, compile and install device-mapper

   configure LVM2, *DO NOT* enable readline support - the readline
   library is on /usr, and this may not be available early in the
   boot. Compile and install.

5) ensure the dm-mod module is insmod'd/modprobe'd early on. Also add
   the --ignorelockingfailure switch to vgchange. Without this,
   vgchange tries to access /var/lock/lvm, which 1) may not be
   mounted, and 2) the root partition will still be read-only at this
   point.

  The error message is something like
  "locking type 1 initialisation failed"

--- /var/tmp/xxx/etc/rc.d/init.d/system 2004-04-29 15:06:46.000000000 +0100
+++ system      2004-05-01 19:04:36.000000000 +0100
@@ -66,7 +66,8 @@
                status
 
        title "Activating Volume Groups..."
-           /sbin/vgchange -ay || error=$?
+           modprobe dm-mod
+           /sbin/vgchange --ignorelockingfailure -ay || error=$?
     fi
        status

-- 
Alan J. Wylie                                          http://www.wylie.me.uk/
"Perfection [in design] is achieved not when there is nothing left to add,
but rather when there is nothing left to take away."