Re: ENOSPC with mkdir and rename

[Austin S Hemmelgarn <ahferroin7@gmail.com>]

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On 2014-08-05 04:20, Duncan wrote:
> Austin S Hemmelgarn posted on Mon, 04 Aug 2014 13:09:23 -0400 as
> excerpted:
> 
>> Think of each chunk like a box, and each block as a block, and that you
>> have two different types of block (data and metadata) and two different
>> types of box (also data and metadata). The data boxes are four times the
>> size of the metadata boxes, and they all have to fit in one really big
>> container (the device itself).  You can only put data blocks in the data
>> boxs, and you can only put metadata blocks in metadata boxes.  Say that
>> in total, you can fit 128 data boxes in the large container, or you can
>> replace one data box with up to four metadata boxes.  Even though you
>> may only have a few blocks in a given box, the box still takes up the
>> same amount of space in the larger container.  Thus, it's possible to
>> have only a few blocks stored, but not be able to add any more boxes to
>> the larger container.  A balance operation is essentially the equivalent
>> of taking all of the blocks of a given type, and fitting them into the
>> smallest number of boxes possible.
> 
> FWIW, that's a great analogy to stick up on the wiki somewhere, probably 
> somewhere in the FAQ related to ENOSPC.  Please consider doing so.
> 
> (Someone took one of my explanations from the list and stuck it in the 
> wiki, virtually word-for-word, with a link to the list post in the 
> archives for more.  I was glad, as for some reason I just seem to work 
> best on the lists, and seem to treat web pages as read-only, even if 
> they're on a wiki I in theory have or can get write-privs on.  I'm 
> suggesting someone, doesn't have to be you tho great if it is, do the 
> same with this.)
> 
I would love to have it up on the wiki, but don't have an account or
write privileges.  FWIW, I consider anything I post on a mailing list
that isn't marked otherwise (except patches) to be public domain, so
everyone feel free to use it however you want.


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