dmraid.static: 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/dmraid.static - from package: dmraid

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

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