brcm_iscsiuio: command not found

Have You tried accessing the binary with the full path?

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/brcm_iscsiuio - from package: iscsi-initiator-utils

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