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I have a machine that contains a disk which one has CentOS 6 Installed.

In that disk, There are two partitions. One of them if mounted on /boot, and the second one is a PV for the rootvg.

I need to replace this disk. How to copy OS from one disk to another safely with no software like Acronis or Symantec Ghost?

  • Are the disks of the same size? What partition table are you using? – v7d8dpo4 Apr 10 '16 at 7:01
  • Yes, the size is the same. There are two partitions: An ext4 partition mount on /boot and another one is a PV, from rootvg. Inside rootvg, I have LVs for root ("/") and swap. – Roger Príncipe Apr 10 '16 at 7:56
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If the size of the disks are the same, you can copy the whole disk.

dd if=/dev/sda of=/dev/sdb

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