Hi, I have a multi-device pool (three discs) as RAID1. Now I want to add a new disc to increase the pool. I followed the description on https://bt rfs.wiki.kernel.org/index.php/Using_Btrfs_with_Multiple_Devices and used 'btrfs add <device> <btrfs path>'. After that I called a balance for rebalancing the RAID1 using 'btrfs balance start <btrfs path>'. Is that anything or should I need to call a resize (for example) or anything else? Or do I need to specify filter/profile parameters for balancing? I am a little bit confused because the balance command is running since 12 hours and only 3GB of data are touched. This would mean the whole balance process (new disc has 8TB) would run a long, long time... and is using one cpu by 100%. Thanks for your help and time. Bye Frank
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