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Reply-To: lev@FreeBSD.org
Subject: Re: ZFS L2ARC checksum errors after compression
References: <921575537.20161029143626@serebryakov.spb.ru>
 <3dae7691-fcd1-b3b9-445c-b81d6f0cdc52@FreeBSD.org>
To: Andriy Gapon <avg@FreeBSD.org>, freebsd-fs <freebsd-fs@FreeBSD.org>
From: Lev Serebryakov <lev@FreeBSD.org>
Organization: FreeBSD
Message-ID: <9cf86479-a8ce-eb30-bcf0-44d8f7a01054@FreeBSD.org>
Date: Tue, 1 Nov 2016 16:26:29 +0300
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On 29.10.2016 16:32, Andriy Gapon wrote:

> I think that a recent upstream change, compressed ARC support, reintroduced an a
> old problem that was fixed a while ago.
 Also, allocated size is growing and I don't believe in this statistic:

NAME SIZE  ALLOC   FREE  EXPANDSZ   FRAG    CAP  DEDUP  HEALTH  ALTROOT
cache            -      -      -         -      -      -
  gpt/l2arc   185G   338G  16.0E         -     0%   182%

 I don't have data with SUCH comressibility on given pool, best
"compression ratio" on one of FSes is 1.30, and is negligible on all
others (it is media files, mostly).

-- 
// Lev Serebryakov