cmsd-3: 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/cmsd-3 - from package: xrootd-compat

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

Error in other languages:
cmsd-3: bevel nie gevind nie
cmsd-3: comandă negăsită
cmsd-3: comando não encontrado
cmsd-3: commande introuvable
cmsd-3: command not found
cmsd-3: käsku ei ole
cmsd-3: không tìm thấy lệnh
cmsd-3: komanda nerasta
cmsd-3: Kommando nicht gefunden.
cmsd-3: kommandot finns inte
cmsd-3: komut yok
cmsd-3: nie znaleziono polecenia
cmsd-3: níor aimsíodh an t-ordú
cmsd-3: no se encontró la orden
cmsd-3: no s'ha trobat l'ordre
cmsd-3: opdracht niet gevonden
cmsd-3: parancs nem található
cmsd-3: perintah tidak ditemukan
cmsd-3: príkaz nenájdený
cmsd-3: příkaz nenalezen
cmsd-3: команда не найдена
cmsd-3: командата не е открита
cmsd-3: 命令找不到
cmsd-3: コマンドが見つかりません