iscsi-target: 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/iscsi-target - from package: netbsd-iscsi

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

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