LWN: Comments on "The 5.1 kernel has been released"

The 5.1 kernel has been released

unixbhaskar — Mon, 06 May 2019 08:52:47 +0000

I do agree, the device-mapper kernel boot line looks exciting.

The 5.1 kernel has been released

zdzichu — Mon, 06 May 2019 06:24:29 +0000

Btrfs driver in kernel need to know about all btrfs devices, in order to mount multi-device filesystem. Passing the information to the kernel is normally done by udev rules in initramfs.

If you want to do it manually, you can. You need to use rootflags= kernel command line parameter and put a series of device= keywords there, describing your multi-device btrfs setup. See https://btrfs.wiki.kernel.org/index.php/Using_Btrfs_with_Multiple_Devices#Registration_in_.2Fetc.2Ffstab for example.

The 5.1 kernel has been released

flussence — Mon, 06 May 2019 05:51:14 +0000

That device-mapper cmdline setup looks promising; I've long wanted something like that for Btrfs (no idea what the current situation is, but back when I tried it couldn't mount a multi-disk Btrfs on / without help from an initramfs).