BTRFS EFI Boot question

BTRFS EFI Boot question

[Lucas Smith]

Hey folks!

Having a confusing question brought up to me by my Debian Testing installer
and am unsure what the implications are for it. I want to run btrfs in
RAID10 on 4x1TB WD RE3 drives. Apparently, my system is set up to boot using
EFI. Are there any reasons not to use EFI Booting in this circumstance?

Re: BTRFS EFI Boot question

[Kai Krakow]

Lucas Smith <vedalken@lksmith.net> schrieb:

> Hey folks!
> 
> Having a confusing question brought up to me by my Debian Testing
> installer and am unsure what the implications are for it. I want to run
> btrfs in RAID10 on 4x1TB WD RE3 drives. Apparently, my system is set up to
> boot using EFI. Are there any reasons not to use EFI Booting in this
> circumstance?

I'm using UEFI boot with btrfs RAID-1 on three devices (including bcache 
meanwhile). It works without problems. The only caveat is, that for both, 
bcache and multi-device btrfs (or combination of both) you need to boot 
using initramfs because the kernel by itself can neither detect multi-device 
btrfs not initialize bcache. This applies if you want to use it for the 
rootfs.

You are all fine if rootfs is something more traditional.

My layout is having the ESP (mounted as /boot), a resume swap and bcache 
caching device on an SSD, the rest is 3x 1TB spinning rust with btrfs, 
containing root and all the other subvolumes.

-- 
Replies to list only preferred.

Re: BTRFS EFI Boot question

[Zia Nayamuth]

Unless you're putting the EFI System Partition (ESP) on the RAID10, you 
should be fine.

Note that the ESP also needs ot be FAT32, so you can't have it as a part 
of your btrfs RAID10 array, so if that's what you are asking, it can't 
be done. An ESP located somewhere else should still be able to boot from 
a rootfs in the RAID10 however, so your OS can be on the RAID.

-- 
Zia Nayamuth

On 6/02/2015 8:30 AM, Lucas Smith wrote:
> Hey folks!
>
> Having a confusing question brought up to me by my Debian Testing installer
> and am unsure what the implications are for it. I want to run btrfs in
> RAID10 on 4x1TB WD RE3 drives. Apparently, my system is set up to boot using
> EFI. Are there any reasons not to use EFI Booting in this circumstance?
>
> --
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