I currently have 3 HDs, each 700Gb and running Btrfs, in this laptop.  Two are used in a RAID1 configuration and one is my snapshot storage.  
I have started experimenting with IPFS and ZeroNet, p2p solutions to Internet censorship. Last night I had 605 peers connected to my IPFS instance. Each can take about 10Mb or more for their web image. When I checked my bandwidth usage before I shut down IPFS there had been about 6Gb into my connection and about 35Gb moved out of my connection to other peers during three hours of usage. Luckily, I have a 60+Mbps connection, soon to be upgraded to 100Mbps, if not 1Gbps. That data is stored in the IPFS repo, which resides at ~/.ipfs. Supposedly, neither Spectrum nor Allo have bandwidth caps, but I suspect that will change if a lot of people start acting as nodes in a P2P network. Spectrum's bandwidth cap history is here. In a chat with an Allo rep he stated that Allo, which is a startup, does not have a bandwidth cap.
Using two of my HDs as RAID1 I suspect that my free disk space will diminish considerably. So, I plan to revert to a system with two HDs forming a single pool, to at least double my free space, while still using the third drive as storage for my @ and @home snapshots.
Here is my setup as it currently is:
	[#]P2P[/#]
[#]BTRFS[/#]
					I have started experimenting with IPFS and ZeroNet, p2p solutions to Internet censorship. Last night I had 605 peers connected to my IPFS instance. Each can take about 10Mb or more for their web image. When I checked my bandwidth usage before I shut down IPFS there had been about 6Gb into my connection and about 35Gb moved out of my connection to other peers during three hours of usage. Luckily, I have a 60+Mbps connection, soon to be upgraded to 100Mbps, if not 1Gbps. That data is stored in the IPFS repo, which resides at ~/.ipfs. Supposedly, neither Spectrum nor Allo have bandwidth caps, but I suspect that will change if a lot of people start acting as nodes in a P2P network. Spectrum's bandwidth cap history is here. In a chat with an Allo rep he stated that Allo, which is a startup, does not have a bandwidth cap.
Using two of my HDs as RAID1 I suspect that my free disk space will diminish considerably. So, I plan to revert to a system with two HDs forming a single pool, to at least double my free space, while still using the third drive as storage for my @ and @home snapshots.
Here is my setup as it currently is:
Code:
	
	 sudo btrfs device usage /
/dev/sda1, ID: 1
   Device size:           691.19GiB
   Device slack:              0.00B
   Data,RAID1:            146.00GiB
   Metadata,RAID1:          3.00GiB
   System,RAID1:           32.00MiB
   Unallocated:           542.15GiB
/dev/sdc, ID: 2
   Device size:           698.64GiB
   Device slack:              0.00B
   Data,RAID1:            146.00GiB
   Metadata,RAID1:          3.00GiB
   System,RAID1:           32.00MiB
   Unallocated:           549.61GiB
                                                                                                                          
 sudo btrfs fi show /     
Label: none  uuid: 12980ae8-4117-4cc5-bbb8-8065e82af93d
        Total devices 2 FS bytes used 146.24GiB
        devid    1 size 691.19GiB used 149.03GiB path /dev/sda1
        devid    2 size 698.64GiB used 149.03GiB path /dev/sdc
 sudo btrfs fi usage /
Overall:
    Device size:                   1.36TiB
    Device allocated:            298.06GiB
    Device unallocated:            1.07TiB
    Device missing:                  0.00B
    Used:                        292.48GiB
    Free (estimated):            547.21GiB      (min: 547.21GiB)
    Data ratio:                       2.00
    Metadata ratio:                   2.00
    Global reserve:              272.50MiB      (used: 0.00B)
Data,RAID1: Size:146.00GiB, Used:144.67GiB
   /dev/sda1     146.00GiB
   /dev/sdc      146.00GiB
Metadata,RAID1: Size:3.00GiB, Used:1.57GiB
   /dev/sda1       3.00GiB
   /dev/sdc        3.00GiB
System,RAID1: Size:32.00MiB, Used:48.00KiB
   /dev/sda1      32.00MiB
   /dev/sdc       32.00MiB
Unallocated:
   /dev/sda1     542.15GiB
   /dev/sdc      549.61GiB
[#]BTRFS[/#]



 It should have been DUP.
  It should have been DUP.
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