8. Creating an emergency boot floppy for ftape
Comment
As of the time of this writing (August 1998) I remember that I have read about several emergency disk sets in the c.o.l.a (comp.os.linux.announce
) news group since the time this section has
been written. Some of those packages actually might produce rather
sophisticated emergency boot floppy sets. Please check out yourself. I
didn't try to create an emergency boot floppy with recent versions of
ftape
.
This section was written by Claus Tøndering
<ct@login.dknet.dk>
.
Once you are the happy owner of a tape drive and several tapes full of backups, you will probably ask yourself this question: ``If everything goes wrong, and I completely lose my hard disk, how do I restore my files from tape?''
What you need is an emergency floppy disk that contains enough files to enable you to boot Linux and restore your hard disk from tape.
The first thing you should do is to read ``The Linux Bootdisk HOWTO'' written by Graham Chapman <grahamc@zeta.org.au>. That document tells you almost everything you need to know about making an emergency floppy boot kit. The paragraphs below contain a few extra pieces of information that will make your life a bit easier when you follow Graham Chapman's procedures:
- You don't really need
/etc/init
,/etc/inittab
,/etc/getty
, and/etc/rc.d/*
on your floppy disk. If Linux doesn't find/etc/init
, it will start/bin/sh
on your console, which is fine for restoring your system. Deleting these files gives you extra space on your floppy, which you will probably need. - Find a small version of
/bin/sh
. They are frequently available on the boot floppies that come with a Linux distribution. This again will give you extra space. I'd suggestash
, which is extremely small (approx 62Kbytes), and yet verybash
compatible. - The
/etc/fstab
you include on your floppy disk should look something like this:
Once you have booted from your floppy, give the command:/dev/fd0 / minix defaults none /proc proc defaults /dev/hda /mnt ext2 defaults
mount -av
- Make sure your floppy drive is not mounted when you access the
streamer tape! Otherwise you may get the following error message:
This means that you MUST load the floppy into a RAMDISK. This has the unfortunate consequence that the programs needed to restore the files from the tape can not be located on a separate floppy disk. You have two options here:Unable to grab IRQ6 for ftape driver
- You place
tar
(orcpio
orafio
or whatever other backup program you use) on your root floppy disk. (This is where you'll need all the extra space created in the steps above.) - Before you start restoring from tape, copy
tar
(orcpio
orafio
or whatever) to your hard disk and load it from there.
- You place
- Apart from your backup program, you will probably need
mt
on your root floppy as well. - Make sure your ftape device (typically
/dev/nqft0
) is present on your boot floppy. - Finally: TRY IT OUT! Of course, I don't recommend that you destroy your hard disk contents to see if you are able to restore everything. What I do recommend, however, is that you try booting from your emergency disks and make sure that you can at least make a file listing of the contents of your backup tape.
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