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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