lvm: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/sbin/lvm - from package: lvm2

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/sbin/lvm - from package: lvm2

You may install the required package with command apt-get install {package}

Error in other languages:
lvm: bevel nie gevind nie
lvm: comandă negăsită
lvm: comando não encontrado
lvm: commande introuvable
lvm: command not found
lvm: käsku ei ole
lvm: không tìm thấy lệnh
lvm: komanda nerasta
lvm: Kommando nicht gefunden.
lvm: kommandot finns inte
lvm: komut yok
lvm: nie znaleziono polecenia
lvm: níor aimsíodh an t-ordú
lvm: no se encontró la orden
lvm: no s'ha trobat l'ordre
lvm: opdracht niet gevonden
lvm: parancs nem található
lvm: perintah tidak ditemukan
lvm: príkaz nenájdený
lvm: příkaz nenalezen
lvm: команда не найдена
lvm: командата не е открита
lvm: 命令找不到
lvm: コマンドが見つかりません