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BTRFS Cache Pool Question

johnodon
in General Support

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Quick question...

 

Does a BTRFS cache pool sacrifice a disk?

 

I have 3x 128GB SSDs in 3 slots in my cache:

 

rjcYcfY.png

 

Why does it show the total size as 384GB but the used and free do not add up to that?

 

When I look at the details of the "Cache", this is what I see:

 

Label: none  uuid: 313257bb-cada-4750-9df3-4ac8b895270d
Total devices 3 FS bytes used 61.01GiB
devid    1 size 119.24GiB used 73.02GiB path /dev/sdb1
devid    2 size 3.97MiB used 0.00 path /dev/sdc1
devid    3 size 119.24GiB used 73.00GiB path /dev/sdd1

Btrfs v3.16.1

 

Why is sdc1 listed as only 3.97MiB?  Does all of this look as expected?

 

John

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