From owner-freebsd-questions@freebsd.org Wed Aug 5 18:26:53 2020 Return-Path: Delivered-To: freebsd-questions@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id B38E53A5EBA for ; Wed, 5 Aug 2020 18:26:53 +0000 (UTC) (envelope-from jacques+freebsd@foucry.net) Received: from mail.foucry.net (fournil.foucry.net [95.217.83.231]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4BMKpN5r6Sz44kQ for ; Wed, 5 Aug 2020 18:26:52 +0000 (UTC) (envelope-from jacques+freebsd@foucry.net) Received: from mithril.localdomain (lfbn-idf2-1-434-144.w86-246.abo.wanadoo.fr [86.246.142.144]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-384) server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mail.foucry.net (Postfix) with ESMTPSA id 188361EBEF for ; Wed, 5 Aug 2020 18:26:36 +0000 (UTC) Received: from mithril (localhost [IPv6:::1]) by mithril.localdomain (Postfix) with ESMTP id 58B6913C57 for ; Wed, 5 Aug 2020 20:26:36 +0200 (CEST) Date: Wed, 5 Aug 2020 20:26:36 +0200 From: Jacques Foucry To: freebsd-questions@freebsd.org Subject: Re: Question re ZFS with mixed drive speeds & types Message-ID: <20200805182636.GD48435@mithril> Mail-Followup-To: freebsd-questions@freebsd.org References: <575C4647-8F20-4187-9B74-2D509D31A249@gmail.com> <4fefedad-5b2a-11b8-7b22-3b6162f0404f@holgerdanske.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <4fefedad-5b2a-11b8-7b22-3b6162f0404f@holgerdanske.com> X-Rspamd-Queue-Id: 4BMKpN5r6Sz44kQ X-Spamd-Bar: --- Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=pass (policy=none) header.from=foucry.net; spf=pass (mx1.freebsd.org: domain of jacques@foucry.net designates 95.217.83.231 as permitted sender) smtp.mailfrom=jacques@foucry.net X-Spamd-Result: default: False [-3.36 / 15.00]; RCVD_TLS_LAST(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; R_SPF_ALLOW(-0.20)[+mx]; MIME_GOOD(-0.10)[text/plain]; TO_DN_NONE(0.00)[]; PREVIOUSLY_DELIVERED(0.00)[freebsd-questions@freebsd.org]; RCPT_COUNT_ONE(0.00)[1]; NEURAL_HAM_LONG(-1.01)[-1.005]; RCVD_COUNT_THREE(0.00)[3]; MID_RHS_NOT_FQDN(0.50)[]; NEURAL_HAM_SHORT(-1.03)[-1.030]; DMARC_POLICY_ALLOW(-0.50)[foucry.net,none]; NEURAL_HAM_MEDIUM(-1.02)[-1.021]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:24940, ipnet:95.217.0.0/16, country:DE]; TAGGED_FROM(0.00)[freebsd] X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 05 Aug 2020 18:26:53 -0000 Le mercredi 05 août 2020 à 01:32:02 (-0700), David Christensen à écrit: > On 2020-08-04 23:55, Greg Marsh wrote: > > Hello everyone. I hope you are well. > > > > I’m budgeting to upgrading my home file server. Sort of for more data capacity, but mostly for more physical space, flexibility and to try some things storage wise. It’s currently got a 6x2tb SATA raidz of WD reds w/ssd for l2arc & logging. > > 1st goal - mirror that ssd. > > > > Now, I’ve got a big box of still working Seagate Cheetah 15k scsi drives & several controllers, both raid and not. The drives are only 146gb, but 15k. However, I’m wondering if I were to make a VDEV pool of like 7 of them, add that to my volume and what, if any positive benefit it might to my ZFS storage? > > > > I ask because about 10 years ago, I was involved in a project that had a HUGE storage component. Many of the vendors we brought in to pitch, including Sun, were promoting tiered storage. Sun in particular were quite proud of this tech. Their system ran ZFS and had a hybrid of ssd, sas & SATA, with the system dynamically moving data around the different speed/capacity drives, based on their activity, all transparent to the application or user. Most often used data coming from the ssd & sas drives, with less active files kept on the SATA drives. I remember the same thing when Sun demostrate us ZFS (I was a Sunkskill at this time). But I never tried. > > > > I’m wondering if this capability made it into the open source version of ZFS. Because that would be fantastic. > > > > Thank you all for any insight or advice. > > > > Cheers, > > Greg > > > Everything I have read recommends using the same size and speed devices > in a given pool. > > > To upgrade a pool, one technique is to replace one device at a time with > a "better" device, wait for the new device to resilver, and repeat until > all devices have been upgraded. Beware that if you have raidz1, you > would be at risk of losing everything if a drive failed while upgrading > another. If you want I wrote a small tuto about that and change my Free∇AS disks. > Using the SSD for cache and using two or more SCSI drives in a mirror > for log makes sense if you want to minimize hardware cost. > > > David > _______________________________________________ > freebsd-questions@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" -- Jacques Foucry