Thanks, with degraded as kernel parameter and also ind the fstab it works like expected
That should be the normal behaviour, cause a server must be up and running, and I don't care about a device loss, thats why I use a RAID1. The device-loss problem can I fix later, but its important that a server is up and running, i got informed at boot time and also in the logs files that a device is missing, also I see that if you use a monitoring program. So please change the normal behavior On Friday, February 1, 2019 7:13:16 PM CET Hans van Kranenburg wrote: > Hi Stefan, > > On 2/1/19 11:28 AM, Stefan K wrote: > > > > I've installed my Debian Stretch to have / on btrfs with raid1 on 2 > > SSDs. Today I want test if it works, it works fine until the server > > is running and the SSD get broken and I can change this, but it looks > > like that it does not work if the SSD fails until restart. I got the > > error, that one of the Disks can't be read and I got a initramfs > > prompt, I expected that it still runs like mdraid and said something > > is missing. > > > > My question is, is it possible to configure btrfs/fstab/grub that it > > still boot? (that is what I expected from a RAID1) > > Yes. I'm not the expert in this area, but I see you haven't got a reply > today yet, so I'll try. > > What you see happening is correct. This is the default behavior. > > To be able to boot into your system with a missing disk, you can add... > rootflags=degraded > ...to the linux kernel command line by editing it on the fly when you > are in the GRUB menu. > > This allows the filesystem to start in 'degraded' mode this one time. > The only thing you should be doing when the system is booted is have a > new disk present already in place and fix the btrfs situation. This > means things like cloning the partition table of the disk that's still > working, doing whatever else is needed in your situation and then > running btrfs replace to replace the missing disk with the new one, and > then making sure you don't have "single" block groups left (using btrfs > balance), which might have been created for new writes when the > filesystem was running in degraded mode. > > -- > Hans van Kranenburg >
