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       lvmcreate_initrd - create an initial ramdisk to boot with root on a logical volume

       lvcmreate_initrd [-i|--iop IOP] [-D|--devfs] [-v|--verbose] [-V|--version] [KernelVersion]

       lvmcreate_initrd  creates  a  new  compressed  initial ramdisk /boot/initrd-lvm-KernelVer-
       sion.gz.  The initial ramdisk contains all necessary binaries, shared libraries and a lin-
       uxrc  file  to  switch  to  a  logical  volume based root filesystem.  To build an initial
       ramdisk for a kernel other than the one currently running add the KernelVersion	parameter
       (e.g.  lvmcreate_initrd 2.3.25) on the command line.

       -h, --help
	      Print a usage message on standard output and exit.

       -i, --iop IOP
	      Specify the LVM kernel IOP version if you are using wrapper scripts in /sbin.  This
	      is only necessary if you are building an initrd for a kernel other than the current
	      one, and you have tools for multiple IOP versions installed.

       -D, --devfs
	      Force  the  use  of  devfs  when	building the initrd.  lvmcreate_initrd by default
	      probes for devfs by checking for /dev/.devfsd, which is created by devfsd  when  it
	      is  running. This option will force lvmcreate_initrd to do this, when devfsd is not
	      currently running.

       -v, --verbose
	      Gives verbose runtime information about the creation of the ram disk image.

       -V, --version
	      Print version number and exit successfully.

       The necessary actions to change your system into a "root on logical volume" one are:

       Create a small (~20MB) partition which is BIOS reachable to hold the /boot filesystem  (if
       you already have a small partition based root filesystem this can be used instead). If you
       want to boot standalone from this partition in an emergency, copy all the necessary  bina-
       ries  and  libraries  to that filesystem as well and create a corresponding /etc/lilo.conf
       entry. In order to be able to edit lilo.conf  when  booted  standalone,	you  should  move
       /etc/lilo.conf  to  /boot/lilo.conf and create a symbolic link to it in /etc.  This is not
       needed if you have a boot/root floppy which contains the LVM binaries and the library.

       Create all logical volumes you need (for root, usr, opt etc.), create filesystems in them,
       mount  them  and  transfer all files from the partition based filesystems into the logical
       volume based ones.

       Set up your /etc/lilo.conf with a boot configuration like:

       image = /boot/vmlinuz
       initrd = /boot/initrd-lvm-KernelVersion.gz
       root = /dev/YourVG/YourRootLV
       label = rootonlv
       append = 'ramdisk_size=8192'

       Replace YourVG and YourRootLV by your actual volume group and root logical  volume  names.
       You  also  need	to change the ramdisk size to be at least as large as that reported while
       lvmcreate_initrd is run.  If you have enough memory, it is  OK  if  the	ramdisk  size  in
       /etc/lilo.conf  is  larger  than  what lvmcreate_initrd reports (the memory is freed after
       booting).  Also, your /etc/fstab in the root logical volume should contain entries for the
       root LV, and the boot partition, along with any other LVs you have configured:

       /dev/YourVG/YourRootLV	   /	 ext2	defaults   0   1
       /dev/YourBootPartition	   /boot ext2	defaults   0   2
       /dev/YourVG/YourUsrLV	   /usr  ext2	defaults   0   3
       /dev/YourVG/YourOptLV	   /opt  ext2	defaults   0   4

       You  can  use other supported filesystem types as well (e.g. reiserfs) if you have support
       for those in your kernel.  Run lilo, reboot and try...

       The partitions containing the former /usr, /opt etc. filesystems can now be used as physi-
       cal  volumes.   Use pvcreate(8) to turn them into PVs and then use vgextend(8) to add them
       to e.g.	YourVG.

       lvcmcreate_initrd returns 0 for success.  1 is returned in all other cases.

       lilo(8), lilo.conf(5), fstab(5), lvm(8),  pvcreate(8),  vgextend(8),  lvcreate(8),  vgcre-

       Heinz Mauelshagen <Linux-LVM@Sistina.com>

Heinz Mauelshagen			    LVM TOOLS			      LVMCREATE_INITRD(8)
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