dmevent_tool: 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/dmevent_tool - from package: dmraid-events

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

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