h5perf: 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 CentOS possible default full paths are:

/usr/lib64/mpich/bin/h5perf - from package: hdf5-mpich
/usr/lib/mpich/bin/h5perf - from package: hdf5-mpich
/usr/lib64/openmpi/bin/h5perf - from package: hdf5-openmpi
/usr/lib/openmpi/bin/h5perf - from package: hdf5-openmpi

You may install the required package with command yum install {package}
Error in other languages:
h5perf: bevel nie gevind nie
h5perf: comandă negăsită
h5perf: comando não encontrado
h5perf: commande introuvable
h5perf: command not found
h5perf: käsku ei ole
h5perf: không tìm thấy lệnh
h5perf: komanda nerasta
h5perf: Kommando nicht gefunden.
h5perf: kommandot finns inte
h5perf: komut yok
h5perf: nie znaleziono polecenia
h5perf: níor aimsíodh an t-ordú
h5perf: no se encontró la orden
h5perf: no s'ha trobat l'ordre
h5perf: opdracht niet gevonden
h5perf: parancs nem található
h5perf: perintah tidak ditemukan
h5perf: príkaz nenájdený
h5perf: příkaz nenalezen
h5perf: команда не найдена
h5perf: командата не е открита
h5perf: 命令找不到
h5perf: コマンドが見つかりません