RHEL 6.5 boot on SAN : no more booting

Hello,

One of my serveur is no more booting, it is stuck at the grub stage and is throwing this error message :

Trying to allocate 1005 poages for VMLINUZ
[LINUX-EFI, setup=0x1040, size=0x3ecab0]
no free pages available
Error 27: Unrecognized command

Has someone already such error ?

My server was able to boot before, hardware is Hitachi CB520X1, in BIOS boot is set as UEFI.