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On Freitag, 12. September 2014, 15:53:19 Joseph wrote: |
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> I have two identical HD in a box and want to duplicate sda to sdb |
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OK, do you want to copy just the boot sector or clone the whole disk with all |
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data on it? |
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> I want sdb to be bootable just in case something happens to sda so I can |
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> swap the drives and boot. |
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> |
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> Do I boot from USB and run: |
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> dd if=/dev/sda of=/dev/sdb bs=512 count=1 |
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> |
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If you want to copy *all* data, why stop after one block? Omit the "count=1" |
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and clone the whole disk. BTW: It might go a little faster of you increase the |
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block size, lets say bs=4096. |
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|
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> fdisk -l /dev/sda |
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> |
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> Disk /dev/sda: 596.2 GiB, 640135028736 bytes, 1250263728 sectors |
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> Units: sectors of 1 * 512 = 512 bytes |
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> Sector size (logical/physical): 512 bytes / 512 bytes |
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> I/O size (minimum/optimal): 512 bytes / 512 bytes |
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> Disklabel type: dos |
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> Disk identifier: 0x000f2548 |
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> |
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> Device Boot Start End Blocks Id System |
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> /dev/sda1 * 63 80324 40131 83 Linux |
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> /dev/sda2 80325 16868249 8393962+ 82 Linux swap / Solaris |
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> /dev/sda3 16868250 121740569 52436160 83 Linux |
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> /dev/sda4 121740570 1250258624 564259027+ 83 Linux |
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> |
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> fdisk -l /dev/sdb |
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> |
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> Disk /dev/sdb: 596.2 GiB, 640133946880 bytes, 1250261615 sectors |
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> Units: sectors of 1 * 512 = 512 bytes |
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> Sector size (logical/physical): 512 bytes / 512 bytes |
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> I/O size (minimum/optimal): 512 bytes / 512 bytes |
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