dpm-disk-to-dpns: 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-disk-to-dpns - from package: dpm-contrib-admintools

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

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