megaraid_lsmplugin: 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
/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/megaraid_lsmplugin - from package: libstoragemgmt-megaraid-plugin

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