pdata_tools: 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/pdata_tools - from package: device-mapper-persistent-data
/usr/sbin/pdata_tools - from package: device-mapper-persistent-data

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

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