rescan-scsi-bus: 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 Debian possible default full paths are:

/sbin/rescan-scsi-bus - from package: scsitools

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

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