[PC-BSD Dev] ZFS dedup

Pavel Arefiev vans9 at yandex.ru
Tue Jul 23 04:16:41 PDT 2013

В письме от 22 июля 2013 16:05:31 пользователь Kris Moore написал:
> On 07/22/2013 15:31, Radio młodych bandytów wrote:
> > On 22/07/2013 21:02, Kris Moore wrote:
> >> Plus everything I hear is to avoid dedup at all costs right now.
> > 
> > Why?
> From my understanding, dedup stores the matching blocks list entirely
> inside of memory. ZFS being rather memory hungry, its possible to exaust
> this memory pool *very* quickly. The result can be a panic, and losing
> your data on disk, since the memory tables are now lost :(
> For more details you'd have to ask some of the FreeNAS ZFS guys, but
> that was the gist of it. It was a serious enough problem that they
> recommended we not even offer the option, until a solution can be found.


Well, I've heard the same things that's why dedup may be a thing we should 
avoid using right now. I'll try to make manual installation with dedup set on 
root dataset and discover if there is any gain.


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