fence_bladecenter: 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/sbin/fence_bladecenter - from package: fence-agents

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

On Debian possible default full paths are:

/usr/sbin/fence_bladecenter - from package: fence-agents

You may install the required package with command apt-get install {package}

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