Where can I find a BTRFS guide?

phillxnet · September 27, 2017, 10:51am

@petermc Just a note on this re the DUP Metadata on the single profile:

As per:

github.com/rockstor/rockstor-core

single pool metadata level is single not dup

opened 02:06PM - 27 Jul 16 UTC

closed 12:59PM - 28 Mar 17 UTC

phillxnet

enhancement

The current default of a single pool metadata level appears to be single also. M…y understanding was that in the case of single pool creation we intended metadata to default to dup, not single: https://forum.rockstor.com/t/internal-implementation-of-pools-shares-snapshots-and-clones/453 ``` btrfs fi df /mnt2/single-pool/ Data, single: total=8.00MiB, used=64.00KiB System, single: total=4.00MiB, used=16.00KiB Metadata, single: total=248.00MiB, used=128.00KiB GlobalReserve, single: total=16.00MiB, used=0.00B ``` Tested on current master branch. This would also bring our single data pools in line with the rockstor_rockstor single pool profile ie: ``` btrfs fi df /mnt2/rockstor_rockstor/ Data, single: total=3.37GiB, used=2.71GiB System, DUP: total=8.00MiB, used=16.00KiB System, single: total=4.00MiB, used=0.00B Metadata, DUP: total=471.50MiB, used=165.94MiB Metadata, single: total=8.00MiB, used=0.00B GlobalReserve, single: total=64.00MiB, used=0.00B ``` so single data and dup metadata. It would also provide a more robust default without sacrificing much in the way of space. Comments?

which was addressed by @suman in:

and included in released Rockstor as of:

Rockstor enforces a DUP metadata on all newly created Single profile pools just to give a little more safety, at least on the meta data front.

Hope that helps to explain your DUP metadata result when selecting a Single profile.