smnotify: 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/smnotify - from package: ctdb

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

On Debian possible default full paths are:

/usr/bin/smnotify - from package: ctdb

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

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