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5.3.6. Activating and Mounting the Original Logical Volume
Since you had to deactivate the logical volume
mylv, you need to activate it again before you can mount it.
root@tng3-1 ~]# lvchange -a y mylv
[root@tng3-1 ~]# mount /dev/myvg/mylv /mnt
[root@tng3-1 ~]# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/yourvg/yourlv 24507776 32 24507744 1% /mnt
/dev/myvg/mylv 24507776 32 24507744 1% /mnt