Hi, everyone:
I install a opensuse leap 42.1 as a little server. with two disk on raid1 (/dev/sda and /dev/sdb).

Both disk have exactly the same parition tables,
/dev/sdx1 EFI
/dev/sdx2 swap
/dev/sdx3 md0 / (root fs)
/dev/sdx4 md1 /srv (server data as network folders, emails, etc)

Due a mistake at install, the installer has formated and use both swaps (/dev/sda2 & /dev/sdb2). At this moment and for other reasons i need remove /dev/sdb disk (and replace for other more greater).
So i do as allways do, comment out the line that mount swap on FSTAB file.

Code:
#UUID=fc78ffcc-da23-4e39-aa40-0039f5d4acfe swap swap defaults 0 0
#UUID=6500c333-fadb-4ac6-a629-86641f11cfbf swap swap defaults 0 0

/dev/sda2        swap swap defaults 0 0

UUID=739e0500-ba15-4679-bee4-22817aeae2f6 / btrfs defaults 0 0
UUID=739e0500-ba15-4679-bee4-22817aeae2f6 /boot/grub2/i386-pc btrfs subvol=@/boot/grub2/i386-pc 0 0
UUID=739e0500-ba15-4679-bee4-22817aeae2f6 /boot/grub2/x86_64-efi btrfs subvol=@/boot/grub2/x86_64-efi 0 0
UUID=739e0500-ba15-4679-bee4-22817aeae2f6 /home btrfs subvol=@/home 0 0
UUID=739e0500-ba15-4679-bee4-22817aeae2f6 /opt btrfs subvol=@/opt 0 0
#UUID=739e0500-ba15-4679-bee4-22817aeae2f6 /srv btrfs subvol=@/srv 0 0
UUID=739e0500-ba15-4679-bee4-22817aeae2f6 /tmp btrfs subvol=@/tmp 0 0
UUID=739e0500-ba15-4679-bee4-22817aeae2f6 /usr/local btrfs subvol=@/usr/local 0 0
UUID=739e0500-ba15-4679-bee4-22817aeae2f6 /var/crash btrfs subvol=@/var/crash 0 0
UUID=739e0500-ba15-4679-bee4-22817aeae2f6 /var/lib/libvirt/images btrfs subvol=@/var/lib/libvirt/images 0 0
UUID=739e0500-ba15-4679-bee4-22817aeae2f6 /var/lib/mailman btrfs subvol=@/var/lib/mailman 0 0
UUID=739e0500-ba15-4679-bee4-22817aeae2f6 /var/lib/mariadb btrfs subvol=@/var/lib/mariadb 0 0
UUID=739e0500-ba15-4679-bee4-22817aeae2f6 /var/lib/mysql btrfs subvol=@/var/lib/mysql 0 0
UUID=739e0500-ba15-4679-bee4-22817aeae2f6 /var/lib/named btrfs subvol=@/var/lib/named 0 0
UUID=739e0500-ba15-4679-bee4-22817aeae2f6 /var/lib/pgsql btrfs subvol=@/var/lib/pgsql 0 0
UUID=739e0500-ba15-4679-bee4-22817aeae2f6 /var/log btrfs subvol=@/var/log 0 0
UUID=739e0500-ba15-4679-bee4-22817aeae2f6 /var/opt btrfs subvol=@/var/opt 0 0
UUID=739e0500-ba15-4679-bee4-22817aeae2f6 /var/spool btrfs subvol=@/var/spool 0 0
UUID=739e0500-ba15-4679-bee4-22817aeae2f6 /var/tmp btrfs subvol=@/var/tmp 0 0
UUID=739e0500-ba15-4679-bee4-22817aeae2f6 /.snapshots btrfs subvol=@/.snapshots 0 0
UUID=EC2F-39DA       /boot/efi            vfat       umask=0002,utf8=true  0 0
/dev/md1        /srv    ext4    defaults 0 0
But this does not work, the system never boot and freeze saying the following:
Code:
Starting Dracut Emergency shell.
warning: /dev/disk/by-uuid/6500c333-fadb-4ac6-a629-86641f11cfbf does not exits 
warning: boot has failed. to debug this issue add "rd.shell rd.debug" to the kernel.......
FAILED failed to start dracut emergency shell
see systemctl status dracut-emergency.service
The curious is after boot the system only mount and work with /dev/sda2 swap.

How i can remove /dev/sdb disk safely and fix the dracut?