pvmove: 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/pvmove - from package: lvm2

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

On Debian possible default full paths are:

/sbin/pvmove - from package: lvm2

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

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