linux df 显示旧的挂载

Question

df 命令显示不再存在的旧 cifs 挂载。唯一活跃的坐骑是

"//***/HR-Backup"

系统是 debian 的。我怎样才能摆脱旧条目，它们为什么会出现？

Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/sda1             29657164   2132588  26018068   8% /
tmpfs                   517208         0    517208   0% /lib/init/rw
udev                    512764        92    512672   1% /dev
tmpfs                   517208         0    517208   0% /dev/shm
//***/he-backup$/
                 503313404 396248316 107065088  79% /mnt/backup
//***/Report-Calls-Redmine$/
                 292415096  67284924 225130172  24% /mnt/reporting
//***/he-backup$/
                 503313404 396248316 107065088  79% /mnt/backup
//***/Report-Calls-Redmine$/
                 292415096  67284924 225130172  24% /mnt/reporting
//***/he-backup$/
                 503313404 396248316 107065088  79% /mnt/backup
//***/Report-Calls-Redmine$/
                 292415096  67284924 225130172  24% /mnt/reporting
//***/he-backup$/
                 503313404 396248316 107065088  79% /mnt/backup
//***/Report-Calls-Redmine$/
                 292415096  67284924 225130172  24% /mnt/reporting
//***/he-backup$/
                 503313404 396248316 107065088  79% /mnt/backup
//***/Report-Calls-Redmine$/
                 292415096  67284924 225130172  24% /mnt/reporting
//***/he-backup$/
                 503313404 396248316 107065088  79% /mnt/backup
//***/Report-Calls-Redmine$/
                 292415096  67284924 225130172  24% /mnt/reporting
//***/he-backup$/
                 503313404 396248316 107065088  79% /mnt/backup
//***/Report-Calls-Redmine$/
                 292415096  67284924 225130172  24% /mnt/reporting
//***/Report-Calls-Redmine$/
                 292415096  67284924 225130172  24% /mnt/reporting
//***/he-backup$/
                 503313404 396248316 107065088  79% /mnt/backup
//***/HR-Backup
                 503313404 396248316 107065088  79% /mnt/backup

Answer 1

umount /mnt/backup

对于所有这些。我想当 df 显示它们时它们仍然以某种方式安装。什么

mount

显示？