dpm-list-disk: 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/dpm-list-disk - from package: dpm-contrib-admintools

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

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