From owner-freebsd-fs@freebsd.org Sun Jan 20 15:34:02 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 E97F71495AFC for ; Sun, 20 Jan 2019 15:34:01 +0000 (UTC) (envelope-from jdelisle@gmail.com) Received: from mail-lj1-x232.google.com (mail-lj1-x232.google.com [IPv6:2a00:1450:4864:20::232]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id AADC36CB56 for ; Sun, 20 Jan 2019 15:34:00 +0000 (UTC) (envelope-from jdelisle@gmail.com) Received: by mail-lj1-x232.google.com with SMTP id n18-v6so15434019lji.7 for ; Sun, 20 Jan 2019 07:34:00 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=JCzFN//mQGZEGvef0EvSu/ZPaf1lA7/tneQbyR7OsDU=; b=J/m/UJNueps3FBpTMJi+7EPcq19PinQvqAbXHURxMZ1jP9znYgTY7mqDk/fEBxmBmI qBVlF8kAVSBC4Qr9dIGOeQdvqv9hByVd23xXoZ/XGyqz129q6jeC3QBh7SOkv7FcsJxQ klHLnPIe1ZPXiA6tfql5oCP0NwNpXboojcVrCpOgiU3ufxiRXih4C+WlxLfdSDD9bQH5 Fm7/gRxDd9kW4jZzkoZqBe5dyOf4C8OKQctkYbe9zOxDC8PT0cbink/mILtk+H1biBh+ BHxKR6KGM9Q6a2M69g2KSWEYTP6lgWplPs0YqYMS1gS7ZxTc04flLDt5JYHs5a24k7/q B5UA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=JCzFN//mQGZEGvef0EvSu/ZPaf1lA7/tneQbyR7OsDU=; b=fkqJi6cHxyeV7F+8MKIJcerVkG+hM61JQLWIMhNozqUTwWTrFt2AE8v2eESi70CLQZ V6iKmt2RSh1Ld89Kcm80DqImFa1vWQCgb9yru+fZus5nqvHMEFv38o4d6Tpdt09ShSnw 1ZN4HcMul5/DDnHSZG0FbMBRqpVhJO16QuwmuEl8+fcKEdpnLjAV1hLNtGZaw5xvLJOP x2XPQ7/2sVONQOEaMxmVasPGGUUSX9X93FnNLU7FwlXj3dwzqFeFXzF1bxoI/l+Jy0Ro 1hCk/OtBPVH7QHtPm9UNaFZx7h8+PQhT//J2mmUCfvQiZ+LIS4DSnIAI52uyewWKSJT6 a9GA== X-Gm-Message-State: AJcUuke8ugNxGVfQby1hBUkOdqJB74zpAR9egDte1GokBoLObYJm8IQd 7qz18m2hcdJLWuVBR62zemV/4QeNpM+OoUhLUcM= X-Google-Smtp-Source: ALg8bN4VSbkFDqCZguP9eEnxbdh9MG3r72aq8mePY4jVUCxqm4igYSh0WO8i+t6kmQgJoAnnmuinghY4zedNV5WK1S4= X-Received: by 2002:a2e:1b47:: with SMTP id b68-v6mr13912741ljb.104.1547998438454; Sun, 20 Jan 2019 07:33:58 -0800 (PST) MIME-Version: 1.0 References: <1180280695.63420.1547910313494.JavaMail.zimbra@gausus.net> <92646202.63422.1547910433715.JavaMail.zimbra@gausus.net> <1691666278.63816.1547976245836.JavaMail.zimbra@gausus.net> In-Reply-To: From: jdelisle Date: Sun, 20 Jan 2019 09:33:46 -0600 Message-ID: Subject: Re: ZFS on Hardware RAID To: andy thomas Cc: Maciej Jan Broniarz , freebsd-fs X-Rspamd-Queue-Id: AADC36CB56 X-Spamd-Bar: ------ Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=J/m/UJNu; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (mx1.freebsd.org: domain of jdelisle@gmail.com designates 2a00:1450:4864:20::232 as permitted sender) smtp.mailfrom=jdelisle@gmail.com X-Spamd-Result: default: False [-6.65 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20161025]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; R_SPF_ALLOW(-0.20)[+ip6:2a00:1450:4000::/36]; FREEMAIL_FROM(0.00)[gmail.com]; MIME_GOOD(-0.10)[multipart/alternative,text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-fs@freebsd.org]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; TO_MATCH_ENVRCPT_SOME(0.00)[]; TO_DN_ALL(0.00)[]; DKIM_TRACE(0.00)[gmail.com:+]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; RCVD_IN_DNSWL_NONE(0.00)[2.3.2.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.5.4.1.0.0.a.2.list.dnswl.org : 127.0.5.0]; MX_GOOD(-0.01)[cached: alt3.gmail-smtp-in.l.google.com]; RCVD_TLS_LAST(0.00)[]; NEURAL_HAM_SHORT(-0.96)[-0.963,0]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+,1:+]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US]; RCVD_COUNT_TWO(0.00)[2]; IP_SCORE(-2.68)[ip: (-9.33), ipnet: 2a00:1450::/32(-2.13), asn: 15169(-1.84), country: US(-0.08)]; DWL_DNSWL_NONE(0.00)[gmail.com.dwl.dnswl.org : 127.0.5.0] Content-Type: text/plain; charset="UTF-8" X-Content-Filtered-By: Mailman/MimeDel 2.1.29 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 15:34:02 -0000 On Sun, Jan 20, 2019 at 9:04 AM andy thomas wrote: > I don't h/w RAID controllers do any parity checking, etc for RAID 0 > virtual disks containing only one disk? > I can say for certain that with Dell PERC 6/e RAID (SAS 8087ELP based) cards, when the virtual devices are entire disks each in a RAID0 configuration, the way the adapter writes data to them is effectively the same as JBOD. You can take a RAID0 drive from a PERC 6/e controller and use in with an HBA/ "IT Mode" JBOD controller without issue. I personally migrated 14x 1TB drives off PERC 6/e (all RAID0's) to a SAS 6gbps HBA, and my ZFS VDEV's and pools were totally fine. You can move back and forth no problem. I can't say this is the case for ALL RAID controllers, I've only done this with an old PERC 6/e. > I know ZFS on h/w raid can't possibly be optimal and use of JBOD, > pass-thru or plain HBA is to be preferred at all times but older RAID > controllers don't support non-RAID operation - after all, h/w RAID > controller design is primarily intended for the Windows Server market > where Windows didn't support any kind of software RAID scheme at that time > (it might do know, I don't know). > That's why I did as I describe above. I didn't have the money to buy an HBA until a year or two later, and I had good backups, so I used the PERC 6/e.