From owner-freebsd-doc@freebsd.org Sat Jun 11 21:52:40 2016 Return-Path: Delivered-To: freebsd-doc@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id B76C2AF0555 for ; Sat, 11 Jun 2016 21:52:40 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 869002A10 for ; Sat, 11 Jun 2016 21:52:40 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from bugs.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id u5BLqeV7082926 for ; Sat, 11 Jun 2016 21:52:40 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-doc@FreeBSD.org Subject: [Bug 210222] 19.4.7.2. -- Add warning about ZFS silently masking datasets with the same mountpoints when recursively sending/receiving the root dataset Date: Sat, 11 Jun 2016 21:52:40 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Documentation X-Bugzilla-Component: Documentation X-Bugzilla-Version: Latest X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: b.manas.88@gmail.com X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: freebsd-doc@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-doc@freebsd.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Documentation project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 11 Jun 2016 21:52:40 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D210222 Bug ID: 210222 Summary: 19.4.7.2. -- Add warning about ZFS silently masking datasets with the same mountpoints when recursively sending/receiving the root dataset Product: Documentation Version: Latest Hardware: Any OS: Any Status: New Severity: Affects Some People Priority: --- Component: Documentation Assignee: freebsd-doc@FreeBSD.org Reporter: b.manas.88@gmail.com I was following the handbook in trying to create a backup of the whole filesystem of a system that I had installed & configured. I ran into an iss= ue when trying to send/receive the snapshot of the datasets. ** If a user takes a recursive snapshot of an entire pool, such as with test-system1# zfs snapshot -r zroot@TEST and then sends that to a second ZFS system, such as with test-system1# zfs send -vR zroot@TEST | ssh test-system2 zfs recv -Fdvu zroot/TEST/test-system1_zroot the resulting datasets on the receiving side will have mountpoints that are exactly the same as some of the datasets that already exist. ZFS does not w= arn about this and upon a reboot, important datasets will be masked. This requi= res booting into a livecd and manually changing the mountpoints so that they ar= e no duplicates. This has happened to me before and I think there should be at l= east a warning in the handbook so that users who are not familiar with ZFS are a= ware of this danger. I spoke to Allan Jude about this at BSDCan 2016 and he responded positively= to making this change. I am happy to submit a patch, I have attended 2 of the = Doc Sprints at BSDCan 2016 and I will be familiarizing myself with the process = of submitting a patch for documentation. --=20 You are receiving this mail because: You are the assignee for the bug.=