vgcreate: 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:

/sbin/vgcreate - from package: lvm2

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

On Debian possible default full paths are:

/sbin/vgcreate - from package: lvm2

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

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