Re: Chunk fullness distribution

[Duncan <1i5t5.duncan@cox.net>]

Bostjan Skufca posted on Fri, 21 Aug 2015 17:49:01 +0200 as excerpted:

> is there a way to get information about how much space is occupied in
> each chunk?
> 
> In the end, a simple ascii chart of usage distribution should be
> preferable, but I can work towards that if there is a way to get
> information about individual chunks.
> 
> I know that "btrfs fi show" displays aggregate info, but having
> distribution chart enables one to predict how much time "btrfs
> rebalance" operation will take for various X values in "dusage=X"
> filter.

AFAIK, no admin-level-user tool to get that information, no.  But doing a 
successive balances while incrementing the -dusage= -musage= counts 
should get you a rough idea (tho it looks like that's what you're trying 
to avoid by asking for the report in the first place), and I believe it's 
findable with the lower-level developer tools, I'd guess btrfs-debug-tree.

-- 
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"Every nonfree program has a lord, a master --
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