h5perf_serial: 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/h5perf_serial - from package: hdf5

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

On Debian possible default full paths are:

/usr/bin/h5perf_serial - from package: hdf5-tools

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

Error in other languages:
h5perf_serial: bevel nie gevind nie
h5perf_serial: comandă negăsită
h5perf_serial: comando não encontrado
h5perf_serial: commande introuvable
h5perf_serial: command not found
h5perf_serial: käsku ei ole
h5perf_serial: không tìm thấy lệnh
h5perf_serial: komanda nerasta
h5perf_serial: Kommando nicht gefunden.
h5perf_serial: kommandot finns inte
h5perf_serial: komut yok
h5perf_serial: nie znaleziono polecenia
h5perf_serial: níor aimsíodh an t-ordú
h5perf_serial: no se encontró la orden
h5perf_serial: no s'ha trobat l'ordre
h5perf_serial: opdracht niet gevonden
h5perf_serial: parancs nem található
h5perf_serial: perintah tidak ditemukan
h5perf_serial: príkaz nenájdený
h5perf_serial: příkaz nenalezen
h5perf_serial: команда не найдена
h5perf_serial: командата не е открита
h5perf_serial: 命令找不到
h5perf_serial: コマンドが見つかりません