vdsm-tool: 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:

/usr/bin/vdsm-tool - from package: vdsm-python

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

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