ray a écrit : > > AMD64 32G RAM > sda, sdb 32GB + 32GB, RAID0 - md0, LVM, GParted shows 1MB reserved, 1 GB (EFI) > sdc, sdd 64GB + 64GB, RAID0- md1, md127, LVM, GParted shows 1MB reserved, 1 > GB (EFI) > sde, sdf 120GB + 120GB, RAID0- md0, md126 LVM, GParted shows 1MB reserved, 1 > GB (EFI) ^^^^^ I guess you mean md2 ?
> sdg, sdh are 2 and 4 GB HD, sdg currently hosts debian8.+q++q ^^^^ I guess you mean TB ? Hard to find 4 GB hard disks these days. > md0-2 form a vg for the new debian8 as dom0 for a xen instance, md127 > is a vg, md126 is a vg. md127 & 126 are for swap files. Why use separate VGs for swaps ? Performance issues ? > gdisk reports that the sda and sdb have gpt partitions. You also report that they contain an EFI system partition. This is required for booting a disk in UEFI mode (as opposed to legacy BIOS mode, which benefits from a BIOS boot partition instead). If the system boots in BIOS/legacy mode instead of native UEFI mode, you should convert the EFI system partition into a BIOS boot partition or create a BIOS boot partition in the 1 MB reserved space. Did the Debian installer boot in EFI or BIOS/legacy mode ? You can see it in different ways. In BIOS mode : - it displays the usual well known boot screen from ISOLinux - assisted mode using the whole GPT disk creates a BIOS boot partition - the "BIOS boot" partition type is available in manual mode on GPT disks - in expert mode, GRUB (grub-pc) and LILO are available as the bootloader and the installer prompts for the boot device In UEFI mode : - it displays a different boot screen from GRUB - assisted mode using the whole disk creates an EFI system partition mounted on /boot/efi - the "EFI system" partition type is available in manual mode - even in expert mode, only GRUB (grub-efi) is available as the bootloader and the installer does not prompts for the boot device. What is the boot mode of the already installed system ? > I have attempted again to install a new debian8 on the LVM on RAID0 > for sda&b. I learned more about using the installer for portioning so I > was able to get /boot on a RAID0 partition (outside of the vg). If the installer booted in BIOS mode, what did you select as the boot device during GRUB installation ? > On rebooting, nothing would boot. The screen message said to insert > the media to boot from. So the firmware does not see a boot disk. Did you remove the harddisks containing the existing Debian installation ?