On 2018/8/30 下午5:13, Pierre Couderc wrote: > Trying to install a RAID1 on a debian stretch, I made some mistake and > got this, after installing on disk1 and trying to add second disk : > > > root@server:~# fdisk -l > Disk /dev/sda: 1.8 TiB, 2000398934016 bytes, 3907029168 sectors > Units: sectors of 1 * 512 = 512 bytes > Sector size (logical/physical): 512 bytes / 512 bytes > I/O size (minimum/optimal): 512 bytes / 512 bytes > Disklabel type: dos > Disk identifier: 0x2a799300 > > Device Boot Start End Sectors Size Id Type > /dev/sda1 * 2048 3907028991 3907026944 1.8T 83 Linux > > > Disk /dev/sdb: 1.8 TiB, 2000398934016 bytes, 3907029168 sectors > Units: sectors of 1 * 512 = 512 bytes > Sector size (logical/physical): 512 bytes / 512 bytes > I/O size (minimum/optimal): 512 bytes / 512 bytes > Disklabel type: dos > Disk identifier: 0x9770f6fa > > Device Boot Start End Sectors Size Id Type > /dev/sdb1 * 2048 3907029167 3907027120 1.8T 5 Extended > > > And : > > root@server:~# btrfs fi show > Label: none uuid: eed65d24-6501-4991-94bd-6c3baf2af1ed > Total devices 2 FS bytes used 1.10GiB > devid 1 size 1.82TiB used 4.02GiB path /dev/sda1 > devid 2 size 1.00KiB used 0.00B path /dev/sdb1 > > ... > > My purpose is a simple RAID1 main fs, with bootable flag on the 2 disks > in prder to start in degraded mode.... > How to get out ofr that...? The 2nd device is indeed strange. Considering how old packages Debian tends to deliver, it should be some old btrfs-progs. You could just boot into the system and execute the following commands: # btrfs device remove 2 <mnt> Then add a new real device to the fs # btrfs device add <new device> <mnt> Then convert the fs to RAID1 # btrfs balance start -dconvert=RAID1 -mconvert=RAID1 <mnt> Thanks, Qu > > Thnaks > PC
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