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root:# dd if=/dev/sdf of=/dev/null

バックグラウンドに回す(ctrl+Z -> bg) などして、USR1シグナルを送ればいい。

root:# killall -USR1 dd
791338977+0 records in
791338976+0 records out
405165555712 bytes (405 GB) copied, 5084.63 s, 79.7 MB/s
機能が向上し, 問題が修正されています
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