ioreplay: 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/ioreplay - from package: ioapps

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