From nobody Thu Apr 21 20:40:29 2022 X-Original-To: freebsd-fs@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id ED7D711D9F54 for ; Thu, 21 Apr 2022 20:40:48 +0000 (UTC) (envelope-from asomers@gmail.com) Received: from mail-oi1-f182.google.com (mail-oi1-f182.google.com [209.85.167.182]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "GTS CA 1D4" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4KkqDw0RZ9z3lVY for ; Thu, 21 Apr 2022 20:40:48 +0000 (UTC) (envelope-from asomers@gmail.com) Received: by mail-oi1-f182.google.com with SMTP id w194so6841820oiw.11 for ; Thu, 21 Apr 2022 13:40:48 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=6YWD3gS/TNgs+nVy2tr81/fsURtYIiGc68shZe2WnbU=; b=tNHr+z1BhkWVhcpW0ngxeCyWdhMKpASJqOJCVaoH9b9gK5nC9rj8uUi/3Yk39cc12j umDOrCOc5aWrasPo6IVabns9CBJybds7rnVl5WhPTVZiETyl6Hyxym6V5m4i2g5UAivC dOkoBnOaA69nmjnSpRRk/wPVXxFXlQIRFpw/bGh+K/0rjCcp745Bt/IhdM0akyk06j8U ttcJsnmeoLBRxOJRjBNv/eUPEqD3rl44Bg4Gd/FBQrM+QQITyQuUci9gCdlBb5uDaYPR mNMnjHictCAe92kqsTV7u6wtiRxKKoJV1xHk1UZ5PTUy2M19sg9fVydgCGWJYTFGeAKQ qk7Q== X-Gm-Message-State: AOAM531vSMN3XJfjdcgkX78fW3miAc5St6ZEMdiClk3kWlWCUlXkcV3Q KwTFGqkjDkPLm7l8fy6IDc/X3ZEtWD63BDu2TI8= X-Google-Smtp-Source: ABdhPJwBS4PZ8acc8Rqx98dy3keV4pv40lSUbMHXg0ug4nHuQe4xAzQfY65GKsMz4Fp2xxPCBPVN5nOaVQwStkw1cmo= X-Received: by 2002:a05:6808:2123:b0:322:79b9:9c1 with SMTP id r35-20020a056808212300b0032279b909c1mr4890969oiw.222.1650573640876; Thu, 21 Apr 2022 13:40:40 -0700 (PDT) List-Id: Filesystems List-Archive: https://lists.freebsd.org/archives/freebsd-fs List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-fs@freebsd.org MIME-Version: 1.0 References: <94c10113c3964b1bbd3f4ddf934c23cd@MAIL-HUB.pai.local> In-Reply-To: <94c10113c3964b1bbd3f4ddf934c23cd@MAIL-HUB.pai.local> From: Alan Somers Date: Thu, 21 Apr 2022 14:40:29 -0600 Message-ID: Subject: Re: ZFS reservations for type=volume To: Michael Jung Cc: freebsd-fs Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: 4KkqDw0RZ9z3lVY X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=pass (mx1.freebsd.org: domain of asomers@gmail.com designates 209.85.167.182 as permitted sender) smtp.mailfrom=asomers@gmail.com X-Spamd-Result: default: False [-2.69 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-0.996]; FREEFALL_USER(0.00)[asomers]; FROM_HAS_DN(0.00)[]; R_SPF_ALLOW(-0.20)[+ip4:209.85.128.0/17:c]; RCVD_TLS_ALL(0.00)[]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-fs@freebsd.org]; DMARC_NA(0.00)[freebsd.org]; NEURAL_HAM_LONG(-1.00)[-1.000]; TO_MATCH_ENVRCPT_SOME(0.00)[]; TO_DN_ALL(0.00)[]; NEURAL_HAM_SHORT(-0.69)[-0.691]; RCPT_COUNT_TWO(0.00)[2]; RCVD_IN_DNSWL_NONE(0.00)[209.85.167.182:from]; MLMMJ_DEST(0.00)[freebsd-fs]; FORGED_SENDER(0.30)[asomers@freebsd.org,asomers@gmail.com]; RWL_MAILSPIKE_POSSIBLE(0.00)[209.85.167.182:from]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:15169, ipnet:209.85.128.0/17, country:US]; FROM_NEQ_ENVFROM(0.00)[asomers@freebsd.org,asomers@gmail.com]; FREEMAIL_ENVFROM(0.00)[gmail.com]; RCVD_COUNT_TWO(0.00)[2] X-ThisMailContainsUnwantedMimeParts: N A dataset's reservation is local. It doesn't contribute to its parent's reservation. Otherwise, you wouldn't be able to separately set a reservation on the parent. But it _does_ contribute to the parent's "used" value. In that way, you're prevented from reserving too much data on the parent's children. -Alan On Thu, Apr 21, 2022 at 2:28 PM Michael Jung wrote: > > I have a zfs block dataset raid-5400-1/esxi-store1 that I share as an isc= si target and that works great. I have set a reservation > > on that block device equal to its size so that is not sparse and thus whi= le I could over provision guests on the provided LUN, > > the storage presented as the LUN capacity will always be available. At l= east this is what I want to achieve. > > > > What I find strange is that the reservation does not seem to be applied t= o the ZFS pool =E2=80=98raid-5400-1=E2=80=99. Do you really need > > to set your maximum reservation at the pool level, and then apply reserva= tions to all datasets on that volume? And if so > > I would assume you could never set reservations for datasets totaling mor= e than what was reserved for the pool =E2=80=98raid-5400-1=E2=80=99. > > > > I could build out a test environment and figure out constraints but I=E2= =80=99d really like to know the =E2=80=9Chow it is supposed to work=E2=80= =9D > > not the =E2=80=9Chow I find it to work=E2=80=9D. > > > > Thanks in advance. > > > > FreeBSD 14.0-CURRENT #4 main-n253875-8e72f458c6d: > > > > (this is a raidz2 pool =E2=80=93 not my draid pool) > > > > > > root@draid:/usr/src/contrib/bearssl # zfs list -o name,type,used,avail,ra= tio,compression,reservation,refreservation,volsize raid-5400-1 > > NAME TYPE USED AVAIL RATIO COMPRESS RESERV REFRESERV= VOLSIZE > > raid-5400-1 filesystem 18.0T 2.08T 1.36x on none = none - <- no reservation @pool > > root@draid:/usr/src/contrib/bearssl # > > > > root@draid:/usr/src/contrib/bearssl # zfs list -o name,type,used,avail,ra= tio,compression,reservation,refreservation,volsize raid-5400-1/esxi-store1 > > NAME TYPE USED AVAIL RATIO COMPRESS RESER= V REFRESERV VOLSIZE > > raid-5400-1/esxi-store1 volume 16.9T 18.5T 1.78x zstd 15= .6T 16.9T 15.6T <- reservation @dataset > > > > root@draid:/usr/src/contrib/bearssl # zpool list > > NAME SIZE ALLOC FREE CKPOINT EXPANDSZ FRAG CAP DEDUP = HEALTH ALTROOT > > ccache 9.50G 9.10G 406M - - 88% 95% 1.00x = ONLINE - > > raid-5400-1 24.6T 1.52T 23.1T - - 2% 6% 1.00x = ONLINE - <- Free does not reflect reservation @pool > > tank 18.5T 605G 17.9T - - 0% 3% 1.00x = ONLINE - > > zfsroot 103G 33.3G 69.7G - - 31% 32% 1.00x = ONLINE - > > root@draid:/usr/src/contrib/bearssl # > > > > > > CONFIDENTIALITY NOTE: This message is intended only for the use > of the individual or entity to whom it is addressed and may > contain information that is privileged, confidential, and > exempt from disclosure under applicable law. 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