Error: mount: /dev/sda already mounted or /mnt/volume-nyc1-01 busy

Hello! /mnt/volume-nyc1-01 directory exist in ftp but can not create new file or folder.

when i run command “df -h” show bellow:

Filesystem      Size  Used Avail Use% Mounted on
/dev/vda1        25G  1.9G   22G   9% /
tmpfs           504M     0  504M   0% /dev/shm

when i try to run "mount -o discard,defaults /dev/disk/by-id/scsi-0DO_Volume_volume-nyc1-01 /mnt/volume-nyc1-01; " mount command then get error “mount: /dev/sda already mounted or /mnt/volume-nyc1-01 busy

/mnt/volume-nyc1-01” directory exist but can not create file using ftp. please help me… thanks in advance…

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Try to see if anything’s using that mount with this: lsof|grep “/mnt/volume-nyc1-01”

Also try running: mount -vl