My goal here is to be able to have a bootable, running system in the event of a disk failure. I've been running two disks in a RAID-1 configuration, with grub installed on both disks, for some time. My /etc/mdadm/mdadm.conf is essentially empty, as mdadm has been successfully finding my RAID partitions and assembling my arrays at boot time without it.
I've gotten a new 3TB disk (to replacing an old, failing disk), so I'm setting up my first GPT partition table. On my old (MBR) disk, parted shows my first partition as 1 32.3kB 1500GB 1500GB primary boot, raid and I'm able to boot successfully. On my new (GPT) disk, I am only able to install grub if I've set the bios_grub flag (note that this flag doesn't appear in the man page, though it does appear in the documentaiton at http://www.gnu.org/software/parted/manual/parted.html#set) on my partition. If I set the boot or legacy_boot flags, I get snowball:518$ sudo grub-install /dev/sdb /usr/sbin/grub-setup: warn: This GPT partition label has no BIOS Boot Partition; embedding won't be possible!. /usr/sbin/grub-setup: error: embedding is not possible, but this is required for cross-disk install. Unfortunately, I don't seem to be able to set both the bios_grub and the raid flags at the same time. If I set the bios_grub flag, printing the partition table shows no raid flag; if I set the raid flag, printing the partition table shows no bios_grub flag. Booting with the bios_grub flag set, my raid array isn't assembled properly: the partition with bios_grub set isn't added into the array (fortunately, my other disk is good!). So: how can I go about setting up my new disk so I will have a two-disk RAID array if both disks are good, and be able to boot with a degraded array in the event of either disk failing? -- "Erwin, have you seen the cat?" -- Mrs. Shroedinger -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/1bfvoz35op....@snowball.wb.pfeifferfamily.net