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[71.126.180.159]) by smtp.gmail.com with ESMTPSA id k185sm46540781qkd.62.2019.01.19.11.31.28 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 19 Jan 2019 11:31:28 -0800 (PST) From: Brian Bilbrey Message-Id: <5108B64F-2DB8-41F7-A7EC-FEAF007ECB16@orbdesigns.com> Mime-Version: 1.0 (Mac OS X Mail 12.2 \(3445.102.3\)) Date: Sat, 19 Jan 2019 14:31:27 -0500 Subject: Re: zfs on hardware raid array In-Reply-To: <2021985079.63423.1547910450967.JavaMail.zimbra@gausus.net> To: freebsd-stable References: <2021985079.63423.1547910450967.JavaMail.zimbra@gausus.net> X-Mailer: Apple Mail (2.3445.102.3) X-Rspamd-Queue-Id: 23BA86AB9E X-Spamd-Bar: ------ Authentication-Results: mx1.freebsd.org; dkim=pass header.d=orbdesigns.com header.s=orbdesigns header.b=r8/MreKu; dmarc=pass (policy=none) header.from=orbdesigns.com; spf=pass (mx1.freebsd.org: domain of bilbreycomm@orbdesigns.com designates 2607:f8b0:4864:20::835 as permitted sender) smtp.mailfrom=bilbreycomm@orbdesigns.com X-Spamd-Result: default: False [-6.02 / 15.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; R_DKIM_ALLOW(-0.20)[orbdesigns.com:s=orbdesigns]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; FROM_HAS_DN(0.00)[]; R_SPF_ALLOW(-0.20)[+ip6:2607:f8b0:4000::/36]; MV_CASE(0.50)[]; MIME_GOOD(-0.10)[multipart/alternative,text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-stable@freebsd.org]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; RCPT_COUNT_ONE(0.00)[1]; RCVD_COUNT_THREE(0.00)[3]; IP_SCORE(-2.56)[ip: (-8.53), ipnet: 2607:f8b0::/32(-2.37), asn: 15169(-1.83), country: US(-0.08)]; TO_DN_ALL(0.00)[]; DKIM_TRACE(0.00)[orbdesigns.com:+]; DMARC_POLICY_ALLOW(-0.50)[orbdesigns.com,none]; RCVD_IN_DNSWL_NONE(0.00)[5.3.8.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.b.8.f.7.0.6.2.list.dnswl.org : 127.0.5.0]; MX_GOOD(-0.01)[ASPMX2.GOOGLEMAIL.com,ALT2.ASPMX.L.GOOGLE.com,ASPMX.L.GOOGLE.com,ALT1.ASPMX.L.GOOGLE.com,ASPMX4.GOOGLEMAIL.com,ASPMX3.GOOGLEMAIL.com]; TO_MATCH_ENVRCPT_ALL(0.00)[]; NEURAL_HAM_SHORT(-0.95)[-0.953,0]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+,1:+]; RCVD_TLS_LAST(0.00)[]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US]; MID_RHS_MATCH_FROM(0.00)[] Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.29 X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 19 Jan 2019 19:31:32 -0000 (Bcc=E2=80=99d to the OP) You *could* do what I=E2=80=99ve done in the past - make each disk into = a single disk volume presented by the array, then use the presented = volumes to make your mirrors, z2s, etc=E2=80=A6 I=E2=80=99m not running = that anymore, but it was fine and reliable for years. A failed disk = could be replaced in the array, then re-presented to the OS for rebuild. = I actually kept a presented volume back to use as a warm spare in those = circumstances.=20 A reasonably inexpensive alternative is to replace the controller with = one that permits JBOD. Best, Brian > On Jan 19, 2019, at 10:07, Maciej Jan Broniarz = wrote: >=20 > Hi, >=20 > I want to use ZFS on a hardware-raid array. I have no option of making = it JBOD. I know it is best to use ZFS on JBOD, but=20 > that possible in that particular case. My question is - how bad of an = idea is it. I have read very different opinions on that subject, but = none of them seems conclusive. >=20 > Any comments and especially case studies are most welcome. > All best, > mjb > _______________________________________________ > freebsd-stable@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to = "freebsd-stable-unsubscribe@freebsd.org"