On Wed, Jul 26, 2017 at 08:12:19AM -0400, Austin S. Hemmelgarn wrote: > On 2017-07-25 17:45, Hugo Mills wrote: > >On Tue, Jul 25, 2017 at 11:29:13PM +0200, waxhead wrote: > >> > >> > >>Hugo Mills wrote: > >>> > >>>>> You can see about the disk usage in different scenarios with the > >>>>>online tool at: > >>>>> > >>>>>http://carfax.org.uk/btrfs-usage/ > >>>>> > >>>>> Hugo. > >>>>> > >>As a side note, have you ever considered making this online tool > >>(that should never go away just for the record) part of btrfs-progs > >>e.g. a proper tool? I use it quite often (at least several timers > >>per. month) and I would love for this to be a visual tool > >>'btrfs-space-calculator' would be a great name for it I think. > >> > >>Imagine how nice it would be to run.... > >> > >>btrfs-space-calculator -mraid1 -draid10 /dev/sda1 /dev/sdb1 > >>/dev/sdc2 /dev/sdd2 /dev/sde3 for example and instantly get > >>something similar to my example below (no accuracy intended) > > > > It's certainly a thought. I've already got the algorithm written > >up. I'd have to resurrect my C skills, though, and it's a long way > >down my list of things to do. :/ > > > > Also on the subject of this tool, I'd like to make it so that the > >parameters get set in the URL, so that people can copy-paste the URL > >of the settings they've got into IRC for discussion. However, that > >would involve doing more JavaScript, which is possibly even lower down > >my list of things to do than starting doing C again...
> Is the core logic posted somewhere? Because if I have some time, I > might write up a quick Python script to do this locally (it may not > be as tightly integrated with the regular tools, but I can count on > half a hand how many distros don't include Python by default). If it's going to be done in python, I might as well do it myself -- I can do python with my eyes closed. It's just C and JS I'm rusty with. There is a write-up of the usable-space algorithm somewhere. I wrote it up in detail (with pseudocode) in a mail on this list. I've also got several pages of LaTeX somewhere where I tried and failed to prove the correctness of the formula. I'll see if I can dig them out this evening. Hugo. -- Hugo Mills | How do you become King? You stand in the marketplace hugo@... carfax.org.uk | and announce you're going to tax everyone. If you http://carfax.org.uk/ | get out alive, you're King. PGP: E2AB1DE4 | Harry Harrison
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