From owner-freebsd-fs@freebsd.org Wed Apr 24 16:19:11 2019 Return-Path: Delivered-To: freebsd-fs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 1DD3C159D107 for ; Wed, 24 Apr 2019 16:19:11 +0000 (UTC) (envelope-from igor@dilos.org) Received: from mail-lj1-x243.google.com (mail-lj1-x243.google.com [IPv6:2a00:1450:4864:20::243]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "GTS CA 1O1" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 466706D051 for ; Wed, 24 Apr 2019 16:19:10 +0000 (UTC) (envelope-from igor@dilos.org) Received: by mail-lj1-x243.google.com with SMTP id l7so17461239ljg.6 for ; Wed, 24 Apr 2019 09:19:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=dilos-org.20150623.gappssmtp.com; s=20150623; h=from:message-id:mime-version:subject:date:in-reply-to:cc:to :references; bh=YSnt6KM69tKHHnp7abX4olqHib9L22iEjbhCao4h9nQ=; b=r8cw2J8eFMtgfMw0F2HoVi0b1vRN5u28VvS8NvPto5S2fn5E4ft1OCznvbh3hbSBwn tzMnLn+esvZOD5AxPfu43vsGS3oZnq/Tu2MyPrqOA9bydmwedkW5A7O5cu1DEjqgog4+ fenJH8Zx4d9txIcbK9wS/8/i6NFzD2y9SRYQHyHaOevWDxt4K6K4sPU01AsE1y975Kk+ C0x50YIW+V/7YGRchu2hecRnlSXafnVZWE8Pagq5SnKCvx6gCOKE0gfjjWYLhOAL1VYB Im2iH9jKFOt9Xgsm053B2yDOu2+NfnXzm0989Kx0pUOn9Ydap3F/7plDW8PTUmlV2SkI Tr2A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:message-id:mime-version:subject:date :in-reply-to:cc:to:references; bh=YSnt6KM69tKHHnp7abX4olqHib9L22iEjbhCao4h9nQ=; b=UqfkyYwLDZKQDFefsmA0hIwnmIfTFx1MCmXD+u56B689dYfIh5WghrKrRHm0bAFLhb XX4tT6gc6rwLJ7Ghe+BLjLXG/tPyYoL2+iTOv2YunTVM5oCQKqIJpm0ZDJvndeO6HFm9 v2n9TkfeL8CS6whE0wE6Dceiv2YejgKNS6y27fEOkhJgUWC3grdfCRCgDfUdJeJgwvCe amDf+UYfXabIsz9z6UrcRF9ySnWlFdnKSG8B0FKku/rZpzIa2GrsknlCC3IoP5Jp6rbG JcZtKotFHafDKw0JX+sDTEfKznCSfWkrgMJHDSNSiuaw3LFPp+OycPeKFjeHKooroSnS RKHw== X-Gm-Message-State: APjAAAVurKRWIZw21zJIdnZ8lg2EHMd8UdWDZSKMwaNXiY+b7Kap+F1E QUn/OQkDsCmeNWo0oA2J0kkhyCmOUw5pkA== X-Google-Smtp-Source: APXvYqy+f49XGRzVKGdUCqY/vd+ctJIkuEMnimIqAXYqBX2E9OJHk5R1owQg9imFWYz1ALfhqgO4tQ== X-Received: by 2002:a2e:8854:: with SMTP id z20mr7601510ljj.25.1556122748762; Wed, 24 Apr 2019 09:19:08 -0700 (PDT) Received: from [192.168.1.13] ([91.204.56.74]) by smtp.gmail.com with ESMTPSA id y65sm1279637lje.84.2019.04.24.09.19.07 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 24 Apr 2019 09:19:08 -0700 (PDT) From: Igor Kozhukhov Message-Id: <4C9A42C6-5024-4A87-A45C-A43A4562C3BA@dilos.org> Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.8\)) Subject: Re: [developer] Re: [zfs] Re: April OpenZFS Leadership Meeting Date: Wed, 24 Apr 2019 19:19:07 +0300 In-Reply-To: Cc: illumos-zfs , Matthew Ahrens , developer , zfs-devel@list.zfsonlinux.org, zfs-devel@freebsd.org, freebsd-fs , zfs-discuss To: openzfs-developer References: X-Mailer: Apple Mail (2.3445.104.8) X-Rspamd-Queue-Id: 466706D051 X-Spamd-Bar: ------ Authentication-Results: mx1.freebsd.org X-Spamd-Result: default: False [-6.98 / 15.00]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; NEURAL_HAM_SHORT(-0.98)[-0.983,0]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; REPLY(-4.00)[] Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.29 X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 24 Apr 2019 16:19:11 -0000 >=20 > For anecdotal experience regarding root pool compression, the issue = was there with older GRUB loader of OpenSolaris and contemporary Solaris = 10; I believe it was fixed in the illumos branch after the fork (can't = find and point to a commit now, possibly soon after lz4 introduction; no = idea about state of later Solaris releases). >=20 > The problem manifested by GRUB refusing to read datasets (rpool, = rpool/ROOT, rpool/ROOT/$BENAME) that had the compression enabled (even = if no blocks were in fact compressed) or disabled at the moment but = compressed blocks encountered during a read. >=20 > This was one of main reasons early on for my split-root support = scripts, so /usr could be separated into a gzip-9'ed dataset and shrink = from ~3gb to ~1gb on a default install. >=20 > On my current laptop I see rpool has compression=3Doff, rpool/ROOT has = lz4 and rootfs(es) inherit that. Works well WRT stability and = performance. it is known issue with compression=3Don on rpool, but it is know working = scenario for compression=3Don rpool/ROOT as dataset with root fs - it is = working fine on Intel and SPARC it is why i tried to explain to: do not use compression=3Don on pool = itself , but use it on dataset where root file system available =3D = rpool/ROOT and inherit to BE in rpool/ROOT/*. but my English is not good in this context. -Igor >=20 > Hope this helps, > Jim >=20 > -- > Typos courtesy of K-9 Mail on my Android >=20 > ------------------------------------------ > openzfs: openzfs-developer > Permalink: = https://openzfs.topicbox.com/groups/developer/Td7b3a91ecbeec509-M4044865ed= d7f8b2e0eac8460 = > Delivery options: = https://openzfs.topicbox.com/groups/developer/subscription =