From owner-freebsd-questions@freebsd.org Wed Aug 5 09:32:24 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 EDAAE3AF87B for ; Wed, 5 Aug 2020 09:32:24 +0000 (UTC) (envelope-from FreeBSD@shaneware.biz) Received: from ipmail03.adl6.internode.on.net (ipmail03.adl6.internode.on.net [150.101.137.143]) by mx1.freebsd.org (Postfix) with ESMTP id 4BM5xg4kKBz4bS5 for ; Wed, 5 Aug 2020 09:32:22 +0000 (UTC) (envelope-from FreeBSD@shaneware.biz) X-SMTP-MATCH: 0 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A2D6AAAIfCpf/8lRAg5gGgEBAQEBAQE?= =?us-ascii?q?BAQEDAQEBARIBAQEBAgIBAQEBQAeBQwKDA2iCC4MJiQGGC4FrJYN0gS+Wags?= =?us-ascii?q?BPAECBAEBD4Q3BAICgiclOQUNAhABAQYBAQEBAQYEhlWFcgEFIw8BIzMJAhg?= =?us-ascii?q?CAhgOAgJXBgEMCAEBgyKCfJdVm3qBMoVShQ6BDioBhUFLgnyEXoFBgREnDII?= =?us-ascii?q?vLj6EJQIHgyaCYASbY5o1ggFrmX8FKJ99kiibAoY4gXkzGiGDPE8ZDZx2NGc?= =?us-ascii?q?CBgEHAQEDCVcBjQsBgkQBAQ?= Received: from ppp14-2-81-201.adl-apt-pir-bras31.tpg.internode.on.net (HELO leader.local) ([14.2.81.201]) by ipmail03.adl6.internode.on.net with ESMTP; 05 Aug 2020 19:02:16 +0930 Subject: Re: Question re ZFS with mixed drive speeds & types To: Greg Marsh , freebsd-questions@freebsd.org References: <575C4647-8F20-4187-9B74-2D509D31A249@gmail.com> From: Shane Ambler Message-ID: Date: Wed, 5 Aug 2020 19:02:14 +0930 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <575C4647-8F20-4187-9B74-2D509D31A249@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 4BM5xg4kKBz4bS5 X-Spamd-Bar: / Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=none (mx1.freebsd.org: domain of FreeBSD@shaneware.biz has no SPF policy when checking 150.101.137.143) smtp.mailfrom=FreeBSD@shaneware.biz X-Spamd-Result: default: False [-1.00 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-0.82)[-0.825]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; RWL_MAILSPIKE_GOOD(0.00)[150.101.137.143:from]; NEURAL_HAM_LONG(-0.72)[-0.723]; TAGGED_RCPT(0.00)[]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[ShaneWare.Biz]; AUTH_NA(1.00)[]; TO_MATCH_ENVRCPT_SOME(0.00)[]; NEURAL_HAM_SHORT(-0.35)[-0.349]; RCPT_COUNT_TWO(0.00)[2]; R_SPF_NA(0.00)[no SPF record]; FREEMAIL_TO(0.00)[gmail.com,freebsd.org]; RCVD_NO_TLS_LAST(0.10)[]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; RCVD_COUNT_TWO(0.00)[2]; ASN(0.00)[asn:4739, ipnet:150.101.0.0/16, country:AU]; MID_RHS_MATCH_FROM(0.00)[]; RCVD_IN_DNSWL_LOW(-0.10)[150.101.137.143:from] 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 09:32:25 -0000 On 5/8/20 4:25 pm, 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. > 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. ZFS can use ssd drives for a zpool cache, keeping used files on the faster disks, but I don't believe ZFS (or any disk based FS) offers any automatic load balancing between disk types. For automatic load balancing I would expect the use of a distributed file system, like glusterFS or cephFS -- FreeBSD - the place to B...Sharing Disks Shane Ambler