I had used Ubuntu 12.04 to build a mdadm software raid 1 array from 2 harddisks, and then I created a LVM on this array and used this LVM to install my Ubuntu 12.04 system on it (I still have a boot partition outside the LVM).Recently, my system could not boot any more (I guess the 5 years harddisks may be too old and have some problems). I now boot my system from an Ubuntu 16.04 live CD but I could not see the data in my LVM volume.Could anyone guide me the procedures to view my data in the LVM volume? Thanks for any suggestion.EDIT :In fact, the LVM is built on 2 mdadm software raid 1 arrays. The structure is listed below :/dev/sda5 + /dev/sdb5 -> A1 (1st raid 1 array)/dev/sda6 + /dev/sdb6 -> A2 (2nd raid 1 array)A1 + A2 -> LV1 (LVM volume built on 2 raid 1 arrays)When I boot my computer using Ubuntu 16.04 live CD, the output for the following commands is :ubuntu@ubuntu:~$ sudo lvscanubuntu@ubuntu:~$ sudo vgscan  Reading all physical volumes.  This may take a while...ubuntu@ubuntu:~$ sudo pvscan  No matching physical volumes foundubuntu@ubuntu:~$ It seems that I could not find my LVM volume.What could I do to fix this problem? Any comment?
How to recover data from a LVM volume on a mdadm software raid 1 array?
lvm;raid