Thank you for the reply. I had read a number of articles on this which
put me off trying that option and implied rather clumsy solutions which
was why I raised the request. However, I have now tried it and barring
one problem it works and I can boot off either disk.
The problem occurred when I ran grub-install. It failed at the
efibootmgr stage.
Here is the end of the log when installing to a non-raid ESP.
grub-install: info: copying `/boot/grub/x86_64-efi/core.efi' ->
`/boot/efi/EFI/ubuntu/grubx64.efi'.
grub-install: info: Registering with EFI: distributor = `ubuntu', path =
`\EFI\ubuntu\grubx64.efi', ESP at hostdisk//dev/sda,gpt1.
grub-install: info: executing efibootmgr --version </dev/null >/dev/null.
grub-install: info: executing modprobe -q efivars.
grub-install: info: executing efibootmgr -b 0000 -B.
BootCurrent: 0000
Timeout: 1 seconds
BootOrder: 0005,0006,0002,0003,0004
Boot0002* Hard Drive
Boot0003* CD/DVD Drive
Boot0004* Removable Drive
Boot0005* UEFI: SanDisk Cruzer Edge 1.26
Boot0006* UEFI: ST31500341AS
grub-install: info: executing efibootmgr -c -d /dev/sda -p 1 -w -L ubuntu -l
\EFI\ubuntu\grubx64.efi.
BootCurrent: 0000
Timeout: 1 seconds
BootOrder: 0000,0005,0006,0002,0003,0004
Boot0002* Hard Drive
Boot0003* CD/DVD Drive
Boot0004* Removable Drive
Boot0005* UEFI: SanDisk Cruzer Edge 1.26
Boot0006* UEFI: ST31500341AS
Boot0000* ubuntu
Installation finished. No error reported.
And here is the log for a raid1 ESP
grub-install: info: copying `/boot/grub/x86_64-efi/core.efi' ->
`/boot/efi/EFI/ubuntu/grubx64.efi'.
grub-install: info: Registering with EFI: distributor = `ubuntu', path =
`\EFI\ubuntu\grubx64.efi', ESP at mduuid/f1f50fa9a6d7d446dddc9c93a8fc41a3.
grub-install: info: executing efibootmgr --version </dev/null >/dev/null.
grub-install: info: executing modprobe -q efivars.
grub-install: info: executing efibootmgr -c -d.
efibootmgr: option requires an argument -- 'd'
efibootmgr version 0.11.0
usage: efibootmgr [options]
-a | --active sets bootnum active
-A | --inactive sets bootnum inactive
-b | --bootnum XXXX modify BootXXXX (hex)
-B | --delete-bootnum delete bootnum (hex)
-c | --create create new variable bootnum and add to bootorder
-D | --remove-dups remove duplicate values from BootOrder
-d | --disk disk (defaults to /dev/sda) containing loader
-e | --edd [1|3|-1] force EDD 1.0 or 3.0 creation variables, or guess
-E | --device num EDD 1.0 device number (defaults to 0x80)
-g | --gpt force disk with invalid PMBR to be treated as GPT
-H | --acpi_hid XXXX set the ACPI HID (used with -i)
-i | --iface name create a netboot entry for the named interface
-l | --loader name (defaults to \EFI\redhat\grub.efi)
-L | --label label Boot manager display label (defaults to "Linux")
-n | --bootnext XXXX set BootNext to XXXX (hex)
-N | --delete-bootnext delete BootNext
-o | --bootorder XXXX,YYYY,ZZZZ,... explicitly set BootOrder (hex)
-O | --delete-bootorder delete BootOrder
-p | --part part (defaults to 1) containing loader
-q | --quiet be quiet
-t | --timeout seconds set boot manager timeout waiting for user input.
-T | --delete-timeout delete Timeout.
-u | --unicode | --UCS-2 pass extra args as UCS-2 (default is ASCII)
-U | --acpi_uid XXXX set the ACPI UID (used with -i)
-v | --verbose print additional information
-V | --version return version and exit
-w | --write-signature write unique sig to MBR if needed
-@ | --append-binary-args file append extra args from file (use "-"
for stdin)
-h | --help show help/usage
Installation finished. No error reported.
It had installed grubx64.efi to the ESP but not set up the efibootmgr
entries. Once I set those up manually everything worked OK.
I assume I should raise this as a bug and will do so shortly unless
anyone thinks otherwise.
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https://bugs.launchpad.net/bugs/1466150
Title:
Feature request: For EFI system grub-install should be able to install
to multiple disks
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https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1466150/+subscriptions
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