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BSDでumount時「device is busy」したときに誰がアクセスしているか調べるために

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BSDでumountしようとしたとき、umount: /mnt Device busyと言われることがあります。
そのときにどのプロセスが該当マウントポイントにアクセスしているかを調べるにはfstatを使えば良いです。

# fstat /mnt USER CMD PID ... (以下略) root fstat 1182 ... (以下略) root csh 628 ... (以下略)

fstat自身以外にアクセスしている人が分かるので、killするなどの対処をすれば良くなります。

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