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| | :Author: Tim Daneliuk (tundra@tundraware.com) |
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| | :Version: ``$Id: baremetal.rst,v 1.118 2014/08/23 20:09:11 tundra Exp $`` |
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| | :Version: ``$Id: baremetal.rst,v 1.119 2014/08/23 20:21:21 tundra Exp $`` |
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| | Précis |
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| | ------ |
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| | 1) You can use standard Linux commands to do imaged backups of |
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| | your machine. |
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| | 2) You can use this to migrate an OS to a different-sized disk. |
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| | 2) It requires no software installation on the target machine. |
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| | 3) It's simple and scriptable. |
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| | 4) (In theory) It is OS and filesystem agnostic so long as |
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| | ordinary partitioning practices are used. |
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| | 5) You can use this to migrate an OS to a different-sized disk. |
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| | - Downside: |
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| | 1) You cannot do this while the machine is up and running so |
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| | imaging this way requires a machine outage. |
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| | 1) You cannot do this while the machine is up and running because |
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| | the blocks you're backing up may be changing during the backup |
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| | period. That means this kind of imaging requires a machine |
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| | outage. |
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| | 2) Every block in the partition gets copied whether it is used or |
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| | not. |
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| | 3) It's probably not as fast as imaging systems that understand |
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| | the underlying filesystem layout - at least for filesystems |
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| | that have a lot of unused space. |
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| | 4) It requires you to boot from a CD. On consumer grade |
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| | equipment, this is pretty much always possible. But, in data |
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| | centers, this can be challenging because fewer and fewer |
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| | servers have optical drives on them. The good news is that you |
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| | can typically boot the target server from an iso image on your |
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| | laptop by connecting to the server's ILO or KVM console system. |
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| | In some cases, it may be necessary to create a bootable |
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| | thumbdrive of the ``Linux System Rescue CD`` if your server |
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| | only supports boot from USB. |
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| | - These tests were conducted on slow, consumer grade servers connected |
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| | via 1Ge through an unmanaged switch. In an Enterprise class |
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| | networking and NAS environment, we'd expect to see considerably |
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tundra
authored
on 23 Aug 2014