coraid-update: 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/coraid-update - from package: aoetools

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

On Debian possible default full paths are:

/sbin/coraid-update - from package: aoetools

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

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