genfio: 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

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:

/usr/bin/genfio - from package: fio

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