lvmconfig: 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/lvmconfig - from package: lvm2

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

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