fsck.vmfs: 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 Debian possible default full paths are:

/usr/sbin/fsck.vmfs - from package: vmfs-tools

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

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