F18 RC2 btrfs options

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I'm finding the current options and UI for the btrfs options to be non-discoverable, i.e. I don't know what they do.

1. Each option has a red (-0Gb) after it.

2. Redundancy (mirror) is presumably "-d raid1", unclear why it's checkable with one disk.

3. Optimized performance (stripe) is presumably "-d raid0", unclear why it's checkable with one disk.

4. The Technology pop-up menu is unclear which option it applies to, I'm guessing just mirroring and striping. A thin black line separating would make this more clear. Or drop the option entirely (honestly in a GUI I don't see the advantage of LVM or MD over btrfs integrated RAID, compared to the cluttering of the UI that results from providing the choice.)

5. Error detection (parity). Is this the metadata profile? If so, I think it being unchecked by default is confusing, because there isn't a -m none option. I'd even suggest the UI could be eliminated by making some reasonable choices for the user based on the first two options:

Single disk, use metadata default of duplicated on that single disk.
Multiple disk where -d raid0 or raid1, use -m raid1 because it's safer.
Multiple disk where -d raid10, use -m raid10

6. Compression lacks an LZO option, and defaults to ZLIB.


Chris Murphy

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