From owner-freebsd-fs@freebsd.org Sun Jan 20 20:44:11 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 50B3614A5B2D for ; Sun, 20 Jan 2019 20:44:11 +0000 (UTC) (envelope-from andy@time-domain.co.uk) Received: from mail0.time-domain.co.uk (host81-142-251-212.in-addr.btopenworld.com [81.142.251.212]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mail0", Issuer "mail0" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id E3A68812FA for ; Sun, 20 Jan 2019 20:44:09 +0000 (UTC) (envelope-from andy@time-domain.co.uk) Received: from localhost (localhost [127.0.0.1]) by mail0.time-domain.co.uk (8.15.2/8.15.2) with ESMTPS id x0KKi3nr018974 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Sun, 20 Jan 2019 20:44:07 GMT (envelope-from andy@time-domain.co.uk) Date: Sun, 20 Jan 2019 20:44:03 +0000 (GMT) From: andy thomas X-X-Sender: andy-tds@mail0.time-domain.co.uk To: Ireneusz Pluta cc: freebsd-fs Subject: Re: ZFS on Hardware RAID In-Reply-To: Message-ID: References: <1180280695.63420.1547910313494.JavaMail.zimbra@gausus.net> <92646202.63422.1547910433715.JavaMail.zimbra@gausus.net> User-Agent: Alpine 2.21 (BSF 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed X-Rspamd-Queue-Id: E3A68812FA X-Spamd-Bar: +++ Authentication-Results: mx1.freebsd.org X-Spamd-Result: default: False [3.12 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-0.15)[-0.151,0]; FROM_HAS_DN(0.00)[]; NEURAL_SPAM_SHORT(0.88)[0.881,0]; HFILTER_HOSTNAME_4(2.50)[host81-142-251-212.in-addr.btopenworld.com]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[time-domain.co.uk]; AUTH_NA(1.00)[]; NEURAL_HAM_LONG(-0.86)[-0.864,0]; TO_MATCH_ENVRCPT_SOME(0.00)[]; TO_DN_ALL(0.00)[]; MX_GOOD(-0.01)[cached: smtp0.time-domain.co.uk]; RCPT_COUNT_TWO(0.00)[2]; IP_SCORE(-0.14)[asn: 2856(-0.61), country: GB(-0.09)]; R_SPF_NA(0.00)[]; FREEMAIL_TO(0.00)[wp.pl]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:2856, ipnet:81.128.0.0/12, country:GB]; RCVD_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[] 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: Sun, 20 Jan 2019 20:44:11 -0000 On Sun, 20 Jan 2019, Ireneusz Pluta wrote: > W dniu 2019-01-20 o?09:45, andy thomas pisze: >> I run a number of very busy webservers (Dell PowerEdge 2950 with LSI >> MegaRAID SAS 1078 controllers) with the first two disks in RAID 1 as the >> FreeBSD system disk and the remaining 4 disks configured as RAID 0 virtual >> disks making up a ZFS RAIDz1 pool with 3 disks plus one hot spare. > In this configuration, have you ever made a test of causing a drive failure, > to see the hot spare activated? No haven't tried this as the clients never gave me the time to try out possible failure secenarios on the 2950 servers. But I now have a spare 2950 with the same RAID controller as the production servers so I could try that asearly as tomorrow & report back. But I do know a Dell T710 server with Perc 6/i controller and all 8 disks configured as RAID 0 with 5 of them in a ZFS RAIDz1 pool plus one spare, a failed disk can be detached and replaced with the spare using zpool command & the pool resilvered manually. (This was on FBSD 9.3 whose ZFS version 28 I don't think supported automatic activation of hot spares). Resilvering took a long time, about 2.5 days, as these were 1 TB Western Digital Caviar Black disks but it was successful. Andy