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| | :Author: Tim Daneliuk (tundra@tundraware.com) |
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| | :Version: ``$Id: baremetal.rst,v 1.115 2014/08/23 19:13:36 tundra Exp $`` |
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| | :Version: ``$Id: baremetal.rst,v 1.116 2014/08/23 20:04:31 tundra Exp $`` |
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| | Précis |
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| | ------ |
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| | use another local hard drive, SAN connected storage or even a USB-connected |
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| | drive. |
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| | Example Environment |
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| | ------------------- |
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| | In our examples below, we're imaging a CentOS 6.5 machine. The only thing |
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| | dd if=/dev/sda2 of=/shared/root.dd bs=12M # Backup rootvg LVM (rest of OS) |
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| | reboot machine to make it operational again |
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| | How long this takes depends on what your write speed to the shared |
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| | storage is and how big your partitions are. In this case ``sda1`` is |
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| | The ``bs=12`` is environment-specific and you'll have to find a setting for this |
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| | that makes best use of your network and NAS or other storage device. |
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| | Depending on the speed of your processor and network, and the kind of |
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| | data on your hard disk, it may be possible to speed the process up by |
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| | compressing the output of ``dd`` on-the-fly. There's no reason to |
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| | bother doing this for the MBR, but for the actual data partitions, |
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| | it's worth a try. Replace the last two ``dd`` commands with:: |
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| | dd if=/dev/sda1 | gzip >/shared/boot.dd.gz # Backup /boot |
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| | dd if=/dev/sda2 | gzip >/shared/root.dd.gz # Backup rootvg LVM (rest of OS) |
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| | Restore Procedure |
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| | ----------------- |
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| | dd if=/shared/root.dd of=/dev/sda2 bs=12M # Restore rootvg LVM (rest of OS) |
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| | Reboot machine to make it operational again |
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| | If you backed up using compression, then the last two ``dd`` commands |
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| | will be:: |
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| | dd if=/shared/boot.dd.gz | gunzip >/dev/sda1 # Restore /boot |
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| | dd if=/shared/root.dd.gz | gunzip >/dev/sda2 # Restore rootvg LVM (rest of OS) |
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| | On the same network described above, restoring the 52MB ``rootvg`` |
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| | took about 35 mins. |
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tundra
authored
on 23 Aug 2014