wd_role: 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/wd_role - from package: rubygem-whiskey_disk
/usr/lib/ruby/gems/1.8/gems/whiskey_disk-0.6.24/bin/wd_role - from package: rubygem-whiskey_disk

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

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