On 11/22/20 9:08 PM, Sreyan Chakravarty wrote:
dd if=/dev/vg/root_lv of=/mnt/exthdd bs=64k conv=noerror,sync status=progress
1) Why use noerror and sync?
noerror might give me a corrupted image and sync is just going to increase the
size of my image with padding.
Indeed, noerror and sync are both bad advice, do not use them.
2) What is rationale behind block size?
Will using 4M block size instead of 64K give me a different image? I need my
image to be an EXACT COPY.
Block size is for efficiency and 64k is better than 512, but since we are in
2020 go for 4M, it is the best option.
The copy will be perfect even if the total size is not a perfect multiple of
blocksize, dd is smart.
Regards.
--
Roberto Ragusa mail at robertoragusa.it
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