August 24, 20232 yr I have a 1T nvme ssd in my cache pool, around 10% of its place is used. After I added another 500GB disk to the pool. Now the UI shows 46% of usage. But du shows i only have 62GB worth of file. There are no windows vdisk on cache so i think du is reliable in such case? The cache pool is in raid1 mode. Unraid UI shows 762GB usable space. I think adding a 500GB disk should resulting in 500GB total usable space?
August 24, 20232 yr Community Expert 2 hours ago, virgilchen said: I think adding a 500GB disk should resulting in 500GB total usable space? It's a known btrfs issue when using different capacity devices, used and free space reported on main will be correct though.
August 24, 20232 yr Author 4 hours ago, JorgeB said: It's a known btrfs issue when using different capacity devices, used and free space reported on main will be correct though. Used space seems incorrent? du shows only 62G but UI shows 348G
August 24, 20232 yr Community Expert The used space on main will be correct, you can confirm with: btrfs fi usage -T /mnt/pool_name Also note that du is not very reliable with btrfs, sometimes defragmenting the fs helps, if you don't have snapshots.
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