scsi-spin: 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/scsi-spin - from package: scsitools

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

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