ceph_tpbench: 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:

/usr/bin/ceph_tpbench - from package: ceph-test

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

On Debian possible default full paths are:

/usr/lib/ceph/bin/ceph_tpbench - from package: ceph-test

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

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