[ale] rsync and link files
Michael Still (mikes)
MikeS at McBurney.com
Tue Jan 22 14:11:45 EST 2002
Let me explain a little more. This system is an HP Netserver LPr that has a
2-slot hot-swap SCA backplane. In a failure of sda I can pull out the first
disk and replace it with the 2nd. My fstab remains the same and requires
almost no intervention to get the system running again. That is as long as
something like this mirror works.
The backup disk will be sda when it is placed in the first slot because it
gets it's SCSI address via the backplane.
I have tried the bios= options to no avail.
My little script does do a chroot to the new disk so that pathnames are
relative to the mirrored system. I tried both methods of chrooting (lilo -r
/path and traditional chroot) and it still doesn't work properly. I do
think the chroot is required though. Lilo also does not complain about
anything when it is run.
I will take a look at grub as well.
--------------------------------------
Michael Still (MikeS at McBurney.com)
System Administrator
The McBurney Corporation
--------------------------------------
-----Original Message-----
From: hirsch at zapmedia.com [mailto:hirsch at zapmedia.com]
To: ale at ale.org
Sent: Tuesday, January 22, 2002 1:56 PM
To: Michael Still (mikes)
Cc: 'aaron at pd.org'; ALE
Subject: RE: [ale] rsync and link files
Michael Still (mikes) writes:
> Are you using the -a switch?
>
> On another rsync note.. I have a system here that I'm trying to do local
> rsync with to make 'poor man's mirror' of my disk.
>
> I have 2 identical 18G SCSI hd's on sda and sdb and partitioned exactly
the
> same with a /boot and a / (no swap..yeah I know), but the problem is that
> when I reboot with this disk to test my mirror lilo gives LI 01 01 01
01...
> So there is a problem somewhere.
>
> Any ideas? Better ways to do this?
Sure. First, this gets much easier if you use grub instead of lilo.
You don't need to rerun grub after any kernel change because grub
understands filesystems (ext2 and reiserfs).
Second, how are you planning to use this disk? It looks like sda2 is
your current root disk, so is this backup disk sdb2? And will it be
sdb2 or sda2 when you try to boot off it?
Assuming, since I don't know your exact situation, that it is
currently sdb2 but it will be sda2 when you boot off it, you have the
correct 'root=/dev/sda2' line in lilo.conf, but I think you also have
tell lilo which disk it is going to be at boot up. You use the
"disk=xx" for this.
Something like:
disk=/dev/sda
bios=0x80
I'm sorry I don't know the exact command you need. I'd need to know
your exact situation--and then I'd need to play with it for a while.
It is poorly documented in the lilo.conf man page. I think it is
better described in some HOWTO somewhere.
--Michael
> -begin lilo.conf:
> boot = /dev/sdb
> timeout = 50
> prompt
> default = mike
> vga = normal
> read-only
> map=/boot/map
> install=/boot/boot.b
>
> image = /boot/bzImage-mike
> label = mike
> root = /dev/sda2
> -end lilo.conf
>
> -beging sync.sh:
> mount /mnt/backup/root
> mount /mnt/backup/root/boot
> /usr/bin/rsync --delete -xav / /mnt/backup/root
> /usr/bin/rsync --delete -xav /boot/ /mnt/backup/root/boot
> #/usr/sbin/chroot /mnt/backup/root /sbin/lilo -C /root/sync/lilo.conf
> /sbin/lilo -r /mnt/backup/root -v -v -v -C /root/sync/lilo.conf
> sync ; sync ; sync
> umount /mnt/backup/root/boot
> umount /mnt/backup/root
> -end sync.sh
>
> # fdisk -l /dev/sda
>
> Disk /dev/sda: 255 heads, 63 sectors, 2213 cylinders
> Units = cylinders of 16065 * 512 bytes
>
> Device Boot Start End Blocks Id System
> /dev/sda1 * 1 13 104391 83 Linux
> /dev/sda2 14 2211 17655435 83 Linux
>
> # fdisk -l /dev/sdb
>
> Disk /dev/sdb: 255 heads, 63 sectors, 2213 cylinders
> Units = cylinders of 16065 * 512 bytes
>
> Device Boot Start End Blocks Id System
> /dev/sdb1 * 1 13 104391 83 Linux
> /dev/sdb2 14 2211 17655435 83 Linux
>
> --------------------------------------
> Michael Still (MikeS at McBurney.com)
> System Administrator
> The McBurney Corporation
> --------------------------------------
>
>
> -----Original Message-----
> From: aaron [mailto:aaron at pd.org]
> Sent: Tuesday, January 22, 2002 1:16 PM
> To: ALE
> Subject: [ale] rsync and link files
>
>
>
> Was trying to use "rsync" to locally mirror my RH 7.1 hard drive (and
> create a long overdue backup) before updating to RH 7.2
>
> For the most part, rsync is being a gem. However, I would like to
> maintain the various soft, hard and absolute link files in most
> directories and rsync is not transfering or recreating any of the links.
>
> I have reviewed the man and tried several combinations of the link
> handling options listed there with no success. Anyone have a clue
> what I might be missing to get the links to be mirrored with the regular
> files??
>
> thanks...
> aaron
>
>
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