xfsrestore: 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/xfsrestore - from package: xfsdump
/usr/sbin/xfsrestore - from package: xfsdump

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

On Debian possible default full paths are:

/sbin/xfsrestore - from package: xfsdump
/usr/sbin/xfsrestore - from package: xfsdump

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

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