Faster dd for disk clone

UNIX for Advanced & Expert Users
1

Guys can anyone tell how can we do faster disk cloning

Below i found in google

  1. dd if=/dev/sda of=/dev/sdb bs=4096 conv=noerror,sync

So adding "conv=noerror,sync " makes it faster looks against not adding it

  1. Enable write cache activated (hdparm -W1 /dev/sda) then run dd ..

Is above correct ? Any other ideas ?

Thanks!

2

bs=512k is certainly faster than 4k

3

For larger files, somewhat around 200mb - 2gb i even prefer bs=4M .