Austin S. Hemmelgarn posted on Tue, 29 Nov 2016 09:58:50 -0500 as
excerpted:

> On 2016-11-29 09:32, Timofey Titovets wrote:
>> Hi, as wiki say https://btrfs.wiki.kernel.org/index.php/Glossary:

Bad link.  Without the terminating colon it works, however.

https://btrfs.wiki.kernel.org/index.php/Glossary

>> A part of a block group. Chunks are either 1 GiB in size (for data) or
>> 256 MiB (for metadata).

> This is only about the normal case.  Chunks are variable in size.  In
> most cases, data chunks will be 1GB and metadata 256MB.  They will
> however be smaller if there isn't enough space left for a full chunk,
> and will get larger as well once you get past a certain filesystem size
> (I don't remember the exact size, but I've seen people talking about big
> (double digit TB sized) filesystems with 5GB+ sized data chunks).

Yes.  The wiki is correct about the _nominal_ size, but it doesn't say 
"nominal", making the overall claim invalid.

If I had a wiki account I'd probably change it right now, but for 
personal reasons I don't fully understand myself, I seem to treat web 
pages, including wikis I could in theory edit, as read-only, even if the 
alternative is replying repeatedly to list threads such as this, vs. a 
single wiki edit.  [shrug]

-- 
Duncan - List replies preferred.   No HTML msgs.
"Every nonfree program has a lord, a master --
and if you use the program, he is your master."  Richard Stallman

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