[Forgot to Cc the list] On 2018/8/29 下午10:04, Pierre Couderc wrote: > > On 08/29/2018 02:52 PM, Qu Wenruo wrote: >> >> On 2018/8/29 下午8:49, Pierre Couderc wrote: >>> I want to reinstall a RAID1 btrfs system (wchis is now under debian >>> stretch, and will be reinstalled in stretch). >> If you still want to use btrfs, just umount the original fs, and >> >> # mkfs.btrfs -f <old devices> >> >> Then a completely new btrfs. >> > The problem is to "unmount" the RAID1 system.. If it's not the root fs, it could be unmount if there is no user reading/writing or has any opened file. > > I have not found how to do that. > > I have found a solution by reinstalling under debian, it now asks if > need to reformat thez btrfs disk... If it's root fs, either go booting from another device, or just let the installer (well, it's booting from memory/another device already) to re-format the fs. Thanks, Qu >
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