fedfs-set-nsdb-params: 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/sbin/fedfs-set-nsdb-params - from package: fedfs-utils-admin

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

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