From owner-freebsd-fs@FreeBSD.ORG Wed Jul 3 09:07:13 2013 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) by hub.freebsd.org (Postfix) with ESMTP id E6635799 for ; Wed, 3 Jul 2013 09:07:13 +0000 (UTC) (envelope-from berend@pobox.com) Received: from smtp.pobox.com (b-pb-sasl-quonix.pobox.com [208.72.237.35]) by mx1.freebsd.org (Postfix) with ESMTP id A4BB11788 for ; Wed, 3 Jul 2013 09:07:13 +0000 (UTC) Received: from smtp.pobox.com (unknown [127.0.0.1]) by b-sasl-quonix.pobox.com (Postfix) with ESMTP id BE0952B5B7; Wed, 3 Jul 2013 09:07:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=pobox.com; h=date :message-id:from:to:cc:subject:in-reply-to:references :mime-version:content-type:content-transfer-encoding; s=sasl; bh=UYtZTksMegFmts/4itb0e3YqPhA=; b=AcqaiUu6GOvhyzoaFfIlVvDR/pBI dKe5g48ckfpg+3vLeS2iKveJ/+qjObNLVVjlCOeU2mSUzL7js8LWQMm9WYOFvS2j 9vwZ5cV4F7A/ecQAl/WaIra1hZBPyO31ub7uO+znWB0aRIxBQopRwnl4/xAHIxF+ lhDZdMgv4B6VXIg= DomainKey-Signature: a=rsa-sha1; c=nofws; d=pobox.com; h=date:message-id :from:to:cc:subject:in-reply-to:references:mime-version :content-type:content-transfer-encoding; q=dns; s=sasl; b=TuNAlA uhjI4DTbAv9llht5aMvwsfq1bOUS1vw5nOllOi6yxC465q58dMPuGeK6VN9h7upL fRkXJrgDmNkdFSp4JL3v4mj1ZH/O3VFQPMfUqT/Md4wRScjeigYsrkq4zwjPfN2g V9CcTQMFnR/jc1xsNasmGtp7HTroqLRP0JMwo= Received: from b-pb-sasl-quonix.pobox.com (unknown [127.0.0.1]) by b-sasl-quonix.pobox.com (Postfix) with ESMTP id B3D182B5B6; Wed, 3 Jul 2013 09:07:12 +0000 (UTC) Received: from bmach.nederware.nl (unknown [27.252.247.84]) by b-sasl-quonix.pobox.com (Postfix) with ESMTPA id 299E52B5B1; Wed, 3 Jul 2013 09:07:12 +0000 (UTC) Received: from quadrio.nederware.nl (quadrio.nederware.nl [192.168.33.13]) by bmach.nederware.nl (Postfix) with ESMTP id 4441C5C6A; Wed, 3 Jul 2013 21:07:05 +1200 (NZST) Received: from quadrio.nederware.nl (quadrio.nederware.nl [127.0.0.1]) by quadrio.nederware.nl (Postfix) with ESMTP id E05C64A11BF3; Wed, 3 Jul 2013 21:07:09 +1200 (NZST) Date: Wed, 03 Jul 2013 21:07:09 +1200 Message-ID: <8738rw57wi.wl%berend@pobox.com> From: Berend de Boer To: Kevin Day Subject: Re: EBS snapshot backups from a FreeBSD zfs file system: zpool freeze? In-Reply-To: <6488DECC-2455-4E92-B432-C39490D18484@dragondata.com> References: <87li5o5tz2.wl%berend@pobox.com> <87ehbg5raq.wl%berend@pobox.com> <20130703055047.GA54853@icarus.home.lan> <6488DECC-2455-4E92-B432-C39490D18484@dragondata.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL/10.8 EasyPG/1.0.0 Emacs/24.3 (i686-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) Organization: Xplain Technology Ltd MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: multipart/signed; boundary="pgp-sign-Multipart_Wed_Jul__3_21:07:09_2013-1"; micalg=pgp-sha256; protocol="application/pgp-signature" Content-Transfer-Encoding: 7bit X-Pobox-Relay-ID: F28864FC-E3BF-11E2-B2CC-E84251E3A03C-48001098!b-pb-sasl-quonix.pobox.com Cc: freebsd-fs X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 03 Jul 2013 09:07:14 -0000 --pgp-sign-Multipart_Wed_Jul__3_21:07:09_2013-1 Content-Type: text/plain; charset=US-ASCII >>>>> "Kevin" == Kevin Day writes: Kevin> The other option is to not freeze the filesystem before Kevin> taking the snapshot, but again you risk leaving things in Kevin> an inconsistent state, and/or the last few writes you think Kevin> you made didn't actually get committed to disk yet. For Kevin> automated systems that create then clone filesystems for Kevin> new VMs, this can be a big problem. At best, you're going Kevin> to get a warning that the filesystem wasn't cleanly Kevin> unmounted. But I have a couple of disks, and the EBS snapshots are taking slightly one after another with a few ms between, so I don't think ZFS will cover from this. But indeed, you have explained my question very well, thanks!! -- All the best, Berend de Boer ------------------------------------------------------ Awesome Drupal hosting: https://www.xplainhosting.com/ --pgp-sign-Multipart_Wed_Jul__3_21:07:09_2013-1 Content-Type: application/pgp-signature Content-Transfer-Encoding: 7bit Content-Description: OpenPGP Digital Signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.17 (GNU/Linux) iQIcBAABCAAGBQJR0+m9AAoJEKOfeD48G3g5MxcP/j4X0p4oH4NDKcNk/hgW+7qL Lz9xxHME2sLQfjw8g28KHNTQvQ1nAmNocaupQ/9gL/W5UEw+JYC/fKg64CELdmcV YAejDZydSszktK1tuIWZh5EnZQHR7O3q2rFG2qlD61s96ssRxLKWIKIJD113HCmL jxYR/VXJpaSZZANGEZ31krwVohIZjFFYv0aRGkMf4q5CwcBUdM1pDoTjtSgD7GK1 dkJupi2T0uz1S/TF9tjpL5D5GlrOTL8xh9q0Q+m2FvQ2p+YitbIFJeBfbSKkVYp6 uHPxs3TJxWUBTHngad57Ze36tUpod+E6yPCTq6z4xuonwGRY1c84F9K2IrdYwjqm qelVdKx0cNqdB2jSMDlJ2pTH04zG7prmbUZJtOQJZhTLUp1Z4Lp/KoUko7wdGHii CN1tShBnDmi2oACSuAdcPau3FEzuV6j4PlWUY0z87z0oEZWuuA/jbMJ7Y2BrzOGz vrznHytsodU/rInUIMLDviN2zbBo+59nspSWoc2otfoqVNUi0SFnkw07M5ku/GMK PF4UB1y32oNXVXCvc9LFuDM4wVvpmxEd5/hXBlAxqL3LsThsn56p6tt2WsoKlO/W DkKLTm5RS6EOHBaSLnoG5LwD39NsUPZxNNbbO/1w/IaHri4p+QAny+v03JJSnvb4 0/rL0FSEUrPRe81lGbmd =f58n -----END PGP SIGNATURE----- --pgp-sign-Multipart_Wed_Jul__3_21:07:09_2013-1--