bufferstorage-persistent: 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/lib64/piglit/bin/bufferstorage-persistent - from package: piglit

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

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