On 8 Oct 2010 at 8:52, Daniel B. Thurman wrote:
Date sent: Fri, 08 Oct 2010 08:52:27 -0700
From: "Daniel B. Thurman" <dant(a)cdkkt.com>
To: users(a)lists.fedoraproject.org
Subject: Re: rsync or dd to clone a hard drive?
Cut --
Good Questions..
1) How does 4GL compare with Clonezilla?
The one version seems similar to what g4l does with the cd running, where
the bigger version has a database system that needs to be setup.
The one big difference is that g4l has a number of kernels on the cd image,
since some hardware requires the latest kernels, and other hardware works
with older version. So the user can boot from various kernels to find one that
works with there hardware. I even have a method that can be used to add it
to an ntfs partition to boot via grub4dos.
As a side note, it seems at least for downloads the vast number of users are
using windows for the download? About 200 - 300 per day.
2) Why aren't "backup/restore/image/clone" programs such as (1) above
integrated into LiveCDs that have most the Linux core, GUI, Network,
...,
support?
I believe both the smaller version of clonezilla and g4l are included on parted
magic live cd? The g4l script can also be downloaded, and if the support
programs are there, it can be run from various cds. Have in the past made
packages that included the script and some programs that distro live cds
didn't include. Did that for knoppix and finnix, and these same ones worked
with others.
G4L can backup and restore LVM partitions, but currently can not mount
them directly. It can use LVM partitions thru the ftp to store images on LVM
partitions.
For the moment, I use rsync for linux copy/clones/moves from
source to target partitions for the same hardware, and it works.
I do these steps:
(1) Boot with LiveCD
(2) # rsync -ahHAX <source> <target>
Notes:
(a) Optionally add 'z' argument if you want compression and
add 'v' if you want to see verbosity at the expense of transfer
speed.
(b) Abruptly stopped? No problem, run the above command again.
(c) <source> and/or <target> can be remote devices but they have
to be mounted. The <source> ought not be an active running
OS, can be mounted to /mnt via LiveCD. The hardware for the
<source> & <target> ought to be exactly the same if one
expects
the <target> OS to be bootable after transfer has
completed. I have
done this with (a) remote backup source to target and (b)
between
two identical laptops transfers via LiveCD on both, and it
works.
(d) I have not tried to create an rsync "image". If it were
possible
to create an rsync "image" with with FULL
acls/permissions/..., how
would it be possible to perform an rsync "restore"?
I have not tried this.
The disk and partition images are bit level backups, and so full filesystem is
saved. Exception is NTFSCLONE backups of ntfspartitions, which are file
only backups. Also, since it is a bit level backup, pre-clearing of unused
space makes the size of images much smaller.
(3) Setting MBR on boot or / (boot integrated) partitions:
# grub
find /grub/stage1 (or /grub/grub.cfg)
root (hX,Y)
setup (hX,Y)
quit
G4L can backup the MBR and partition table separately, or include it in a full
disk image.
(4) # touch /.autorelabel; reboot (for SELinux)
Bit level makes all this the same.
Thanks for the questions.
In conclussion, G4L is a tool to do disk and partition images, as contrasted to
file level backups.
FWIW,
Dan
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Guam - Where America's Day Begins
G4L Disk Imaging Project maintainer
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