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umount 했을 시 device is busy

OS Linux[centos,RHEL]/Trouble shooting 2025.07.22

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/etc/security/failedlogin, awk, https://m.blog.naver.com/thescream, https://err-bzz.oopy.io/ae2c4b65-4dec-4e47-8e36-84face2c6c8c, https://www.youtube.com/watch?v=KoZVKV5VI-o, /etc/security/login.cfg, https://ja-gamma.tistory.com/entry, dhcp 서버 active-standby ip설정, https://cloud.kt.com/images/product/detail/, hw 디스크 교체, 출처 KT cloud, NBU, sed, netbackup media재인식 방법, was 호출 건수, x3650, Megaraid Storage Manager, nfs mount 후 umount 안되는 증상, 출처 https://www.youtube.com/watch?v=YUXeQulaGyU, https://bluelicht.tistory.com/6,

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