verify_blkparse: 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/verify_blkparse - from package: blktrace

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

On Debian possible default full paths are:

/usr/bin/verify_blkparse - from package: blktrace

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

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