From owner-freebsd-fs@freebsd.org Sun Jan 20 20:15:41 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 E405414A413C for ; Sun, 20 Jan 2019 20:15:40 +0000 (UTC) (envelope-from fjwcash@gmail.com) Received: from mail-lf1-x12e.google.com (mail-lf1-x12e.google.com [IPv6:2a00:1450:4864:20::12e]) (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 68FAB77D11 for ; Sun, 20 Jan 2019 20:15:39 +0000 (UTC) (envelope-from fjwcash@gmail.com) Received: by mail-lf1-x12e.google.com with SMTP id n18so14015432lfh.6 for ; Sun, 20 Jan 2019 12:15:39 -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=oE64pDjvkZGutQtnZr+D4NH//4Du4VihQ+a7iS7Hd2Y=; b=o4/IKqgtDMBxiwrKvWLLHUNZ9IQ6NwlbPZeSjGWVoIu1uZryMjd8YWHFAg9fjTR4P6 4BrE0D/JWdceEbSmbwQdkScV3TAULZjgs3yoY9G32XchrBy1ssLlP/1sZpsZeA47XNQ3 912OWvtjcxs9w1wNP0k0g3vcuFk620tFQf1KwJeAfMQW51N40i8+o2Wy7gHt1g9cl8PY CTgNpuA4Qx324KNElstlQ0A0kITWUj6kUkMK7CGLLU864J5SUx2CCWBK0pCAjHVQad+M l4xOCyrELzvfkles+DAAT8iJjBKzh3Zwlamtwn704EQjp0aVMBZFLbfaC06XrLgbaagL gnYw== 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=oE64pDjvkZGutQtnZr+D4NH//4Du4VihQ+a7iS7Hd2Y=; b=TaBE6Lo7aIWlSB+J8NTZqkup0SilL6hMbNHmrSp9G0v5Xn972E/HM5yEaEh2uXXyHO HLJnhJLcdscqjOJgfr8LRcwJ8fz1T6p82IElVG1Vr9nHwRhNuS9WZPwDpmvZK8ypTRWB aQV3GYfFoTVcdcQFiaIevjMgOdVaSltzeIwOC0xJ1KlaIGjH0ol73fOHJjmdr0Es+SVB GidE4gKIr+VUf4yaYI2WgBaU38r0IBIaepfjt0de9eeByFa67kgO2qH/l09yyX6ZSnZf Zr2HA2HR5dvDz3CBm5yyNAmEJRtOe6lItE1jyO4AttBNcV3xBCBYNz8qeVOVOhPip7Gy W1tQ== X-Gm-Message-State: AJcUukdwxeUoVLqoVGBu2zNeJ3QbiFIeQ3zPxsFOXT9GvbqQ1WLDIhNN aY8sRf2D4PULKx/uY02kPAK0NI+oKP6B9/pkAJw= X-Google-Smtp-Source: ALg8bN4bUWin43/XzZwz/Hd9UWVzBIEPlkazcqOi1fJYN8rML/fGRpEYqc39bMroWImhDyKYfqJgknWkP8eAAJVLBEA= X-Received: by 2002:a19:1cb:: with SMTP id 194mr16602000lfb.61.1548015337690; Sun, 20 Jan 2019 12:15:37 -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: Freddie Cash Date: Sun, 20 Jan 2019 12:15:26 -0800 Message-ID: Subject: Re: ZFS on Hardware RAID To: jdelisle Cc: andy thomas , FreeBSD Filesystems X-Rspamd-Queue-Id: 68FAB77D11 X-Spamd-Bar: ------ Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=o4/IKqgt; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (mx1.freebsd.org: domain of fjwcash@gmail.com designates 2a00:1450:4864:20::12e as permitted sender) smtp.mailfrom=fjwcash@gmail.com X-Spamd-Result: default: False [-6.50 / 15.00]; FREEMAIL_FROM(0.00)[gmail.com]; R_SPF_ALLOW(-0.20)[+ip6:2a00:1450:4000::/36]; TO_DN_ALL(0.00)[]; DKIM_TRACE(0.00)[gmail.com:+]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; MX_GOOD(-0.01)[cached: alt3.gmail-smtp-in.l.google.com]; FREEMAIL_TO(0.00)[gmail.com]; FROM_EQ_ENVFROM(0.00)[]; RCVD_TLS_LAST(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]; DWL_DNSWL_NONE(0.00)[gmail.com.dwl.dnswl.org : 127.0.5.0]; 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]; NEURAL_HAM_SHORT(-0.78)[-0.777,0]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[multipart/alternative,text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-fs@freebsd.org]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[e.2.1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.5.4.1.0.0.a.2.list.dnswl.org : 127.0.5.0]; IP_SCORE(-2.71)[ip: (-9.51), ipnet: 2a00:1450::/32(-2.13), asn: 15169(-1.85), country: US(-0.08)]; RCVD_COUNT_TWO(0.00)[2] 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 20:15:41 -0000 On Sun, Jan 20, 2019, 12:09 PM jdelisle 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. 3Ware controllers configured for Single Disk arrays (which is different from JBOD mode) work the same way. You can move a disk from a Single Disk setup to a software RAID (mdadm or ZFS) without issue. We've migrated many Linux and FreeBSD systems from 3Ware to HBA to onboard SATA at work. I believe the difference between Single and JBOD on the 3Ware is the former allows the onboard cache to be used. Cheers, Freddie Typos due to smartphone keyboard.