From owner-freebsd-questions@freebsd.org Sun Apr 12 05:19:07 2020 Return-Path: Delivered-To: freebsd-questions@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 0942C2B2696 for ; Sun, 12 Apr 2020 05:19:07 +0000 (UTC) (envelope-from ml@netfence.it) Received: from soth.netfence.it (net-2-44-121-52.cust.vodafonedsl.it [2.44.121.52]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "mailserver.netfence.it", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 490KmT4pC5z4dBG for ; Sun, 12 Apr 2020 05:19:05 +0000 (UTC) (envelope-from ml@netfence.it) Received: from alamar.ventu (alamar.local.netfence.it [10.1.2.18]) (authenticated bits=0) by soth.netfence.it (8.15.2/8.15.2) with ESMTPSA id 03C5J0hG034260 (version=TLSv1.3 cipher=TLS_AES_128_GCM_SHA256 bits=128 verify=NO) for ; Sun, 12 Apr 2020 07:19:02 +0200 (CEST) (envelope-from ml@netfence.it) X-Authentication-Warning: soth.netfence.it: Host alamar.local.netfence.it [10.1.2.18] claimed to be alamar.ventu Subject: Re: Restoring and snapshots To: freebsd-questions@freebsd.org References: <56b4e678-0e66-e65b-b9d2-a2e79a5b7b6f@netfence.it> From: Andrea Venturoli Message-ID: <2a0ee11a-eb32-7ae2-256f-ad1b00d1e49d@netfence.it> Date: Sun, 12 Apr 2020 07:19:00 +0200 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 490KmT4pC5z4dBG X-Spamd-Bar: ---- Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=pass (policy=none) header.from=netfence.it; spf=pass (mx1.freebsd.org: domain of ml@netfence.it designates 2.44.121.52 as permitted sender) smtp.mailfrom=ml@netfence.it X-Spamd-Result: default: False [-4.55 / 15.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; FROM_HAS_DN(0.00)[]; R_SPF_ALLOW(-0.20)[+ip4:2.44.121.52]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-questions@freebsd.org]; HAS_XAW(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; TO_DN_NONE(0.00)[]; DMARC_POLICY_ALLOW(-0.50)[netfence.it,none]; IP_SCORE(-1.75)[ip: (-8.41), ipnet: 2.44.0.0/16(-4.20), asn: 30722(3.83), country: IT(0.03)]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:30722, ipnet:2.44.0.0/16, country:IT]; MID_RHS_MATCH_FROM(0.00)[]; RCVD_TLS_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2] X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 12 Apr 2020 05:19:07 -0000 On 2020-04-12 00:18, David Christensen wrote: > I am confused: > > *  What is the type of the filesystem that was the source of the backup? ZFS in the example above, but I've got the same problem with UFS, as I also use snapshot there. > *  What tool(s) did you use to backup? Sometimes Bacula, sometimes some custom scripts. > *  What is the type of the filesystem that was the destination of the > backup? Could be UFS, bacula volumes, tapes, ZIPs, etc... > *  What tool(s) are you using to restore? Again either Bacula or some custom scripts. > *  What is the type of the filesystem that is the destination of the > restore? Usually UFS or ZFS; could be something else. > So, the backup source filesystem and the restore destination filesystems > are both ZFS (?). Possibly, but not always. > The upper Unix filesystem path should be an empty directory. Should, but not always is. Sometimes I found "forgotten" files in the directory which is the target of the nullfs mount. Of course those files are usually hidden and probably useless, but must be taken into account. > I believe it is a result of the 'mountpoint' properties of the two ZFS > file systems and how ZFS represents filesystem snapshots in the Unix > file system. No, this can happen with UFS too. bye & Thanks av.