Re: /etc/fstab rootfs options vs grub2 rootflags cmdline

[Duncan <1i5t5.duncan@cox.net>]

Niccolò Belli posted on Wed, 04 May 2016 15:52:39 +0200 as excerpted:

> Thanks,
> Now my fstab option are
> rw,noatime,compress=lzo,discard,autodefrag,subvolid=257,subvol=/@
> I tried to add rootflags=noatime,compress=lzo,discard,autodefrag to
> GRUB_CMDLINE_LINUX in /etc/default/grub as you suggested but my system
> didn't manage to boot, probably because grub automatically adds
> rootflags=subvol=@ and only a single rootflags can be taken into
> account.
> Do you have any suggestion?

What about the subvol=/@?

I think if you specifically add your own rootflags, grub won't add its 
own, and you said

noatime,compress=lzo,discard,autodefrag

but left off the subvol=/@ (unless you simply forgot to put it in the 
posting), and without that, it would have mounted the btrfs default 
subvolume, which would be (the filesystem's) / (subvolid=5) if you 
haven't changed it, and would have failed to boot as a result.

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