mpathpersist: 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 CentOS possible default full paths are:

/sbin/mpathpersist - from package: device-mapper-multipath

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/sbin/mpathpersist - from package: multipath-tools
/usr/lib/debug/sbin/mpathpersist - from package: multipath-tools-dbg

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

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