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neo_phani
n00b
Joined: 01 Sep 2004
Posts: 67
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 Posted: Thu Aug 04, 2005 8:33 pm Post subject: Resizing partitions with Live CD without loosing data |
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This is my existing disk lay out of my gentoo system on a Maxtor 40 GB hard drive
Disk /dev/hda: 41.1 GB, 41110142976 bytes
255 heads, 63 sectors/track, 4998 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/hda1 * 1 5 40131 83 Linux
/dev/hda2 6 68 506047+ 82 Linux swap
/dev/hda3 69 4998 39600225 83 Linux
I am using Acronis and created a image so that i can recreate the same system by restoring the image. Now i bought a Segate 40 GB HDD and am trying to restore the image and guess what due to the differences in the way that these two manufactures count bytes and hence forth gigs the image from the MAxtor wont fit in the seagate.
and in hda3 i have lot of free space. Is there any way i could trim that free space by booting through live CD like knopixx and then recreate the image? or any other ways to accomplish this trimming of /dev/hda3 without loosing data ...is it possible ?
or any other ways of porting the entire sytem to a new hard drive ....i have done googling but nothing appealing ....
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neo_phani
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Joined: 01 Sep 2004
Posts: 67
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jmbsvicetto
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Joined: 27 Apr 2005
Posts: 4734
Location: Angra do Heroísmo (PT)
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| Posted: Thu Aug 04, 2005 11:48 pm Post subject: |
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Hi.
You can always copy the contents from the old disk to the new disk with
| Code: | | # cp -a /mnt/old_disk /mnt/new_disk |
This should be done with a live-cd and mounting the entire tree for the old and new disk.
If you can't connect both disks to the same system, you can compress the original disk in a tar.bz2 archive, just like the Gentoo base system and portage, and decompress it on the new one.
_________________
Jorge.
Your twisted, but hopefully friendly daemon.
AMD64 / x86 / Sparc Gentoo
Help answer || emwrap.sh
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neo_phani
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Joined: 01 Sep 2004
Posts: 67
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| Posted: Fri Aug 05, 2005 1:02 am Post subject: |
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Thanks for your response jmbsvicetto.
ok i attached them to same machine
under /mnt it shows up as
old disk says
hda1 hda3 (hda2 is swap)
new one says
hdb
i boot through the live cd and do a mount -a (automount as hda and hdb are in /etc/fstab
then cp -a /mnt/hda /mnt/hdb
that didnt work out....the new hard drive has nothing in it. What am i not following. |
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jmbsvicetto
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Joined: 27 Apr 2005
Posts: 4734
Location: Angra do Heroísmo (PT)
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| Posted: Fri Aug 05, 2005 2:41 am Post subject: |
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You didn't understood my suggestion.
If your old disk has the following structure
| Code: | /dev/hda1 /boot ext2 128MB
/dev/hda2 sw swap 512MB
/dev/hda3 /home reiserfs 10GB
/dev/hda4 / ext3 29GB |
and your new disk will have the following structure
| Code: | /dev/hdb1 /boot ext2 128MB
/dev/hdb2 /home reiserfs 10GB
/dev/hdb5 sw swap 512MB
/dev/hdb6 / reiserfs 10GB
/dev/hdb7 /usr jfs 14GB
/dev/hdb8 /var xfs 5GB |
You have to do the following to mount the disks under /mnt/old_disk and /mnt/new_disk.
| Code: | # mkdir /mnt/old_disk
# mkdir /mnt/new_disk
# mount -t ext3 /dev/hda4 /mnt/old_disk
# mount -t ext2 /dev/hda1 /mnt/old_disk/boot
# mount -t reiserfs /dev/hda3 /mnt/old_disk/home
# mount -t reiserfs /dev/hdb6 /mnt/new_disk
# mount -t ext2 /dev/hdb1 /mnt/new_disk/boot
# mount -t reiserfs /dev/hdb2 /mnt/new_disk/home
# mount -t jfs /dev/hdb7 /mnt/new_disk/usr
# mount -t xfs /dev/hdb8 /mnt/new_disk/var |
You can then copy your info from the old disk to the new disk with
| Code: | | # cp -a /mnt/old_disk/* /mnt/new_disk |
Don't forget to update your /etc/fstab and reinstall GRUB after completing this step to be able to boot from your new disk.
_________________
Jorge.
Your twisted, but hopefully friendly daemon.
AMD64 / x86 / Sparc Gentoo
Help answer || emwrap.sh
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jmbsvicetto
Moderator
Joined: 27 Apr 2005
Posts: 4734
Location: Angra do Heroísmo (PT)
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| Posted: Fri Aug 05, 2005 2:44 am Post subject: |
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Oh and before you go ahead, remember that you must first partition your new disk and to make the filesystems. Re-read the Gentoo Handbook if you have any doubts on this.
_________________
Jorge.
Your twisted, but hopefully friendly daemon.
AMD64 / x86 / Sparc Gentoo
Help answer || emwrap.sh
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neo_phani
n00b
Joined: 01 Sep 2004
Posts: 67
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| Posted: Fri Aug 05, 2005 5:14 pm Post subject: |
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| Thank you very much.Will try this.... |
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jfave
Tux's lil' helper
Joined: 28 Jul 2004
Posts: 96
Location: Jacksonville, FL
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| Posted: Sat Aug 06, 2005 4:21 pm Post subject: |
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neo_phani:
jmbsvicetto suggestion will work. I do this all the time with backups and cloning machines constantly. I have several dns machines I admin that have the same hardware specs.
You can even get fancy and cron the backup to a remote machine.... that way when you trash your system you can restore it quickly to its last backup state. Check out this post on stage-4 installs....... https://forums.gentoo.org/viewtopic-t-146750-highlight-stage4.html |
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