From owner-freebsd-fs@FreeBSD.ORG Wed Jul 3 21:52:57 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 7DD798AF; Wed, 3 Jul 2013 21:52:57 +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 46F391A95; Wed, 3 Jul 2013 21:52:56 +0000 (UTC) Received: from smtp.pobox.com (unknown [127.0.0.1]) by b-sasl-quonix.pobox.com (Postfix) with ESMTP id E8BAB2DF4C; Wed, 3 Jul 2013 21:52:55 +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=Xwqhdn8NhTFXy2lmjxjhCiDuUXs=; b=fHl3a+hzKPDFZloBe0LXNftEdg2y HH1SL5CQbKE88Rn4FL428v+UPYBnIOCV0Db3XrZO5A+3f0lUXcijFy73SpkuXK5n uVyVWXX4BttWA8Ewoas+GWfOcbBJac7aS9RZmdZVHZZiz2b2UxttEJaSpVVRIBKT 686lrPpVB5aF/wM= 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=fH5T7z RJIcUOTNt5tbW1/qa7JBt0/+8hOn3hVJ6MNol5hDskJLVTm2AcO52H0w3GC7kegT ehpsnPF1PkyX+pLDoQx0bpfyFu1cXAczERT8ZXlCu1I4ft0/V+qHKO9qAd54zjsd ubHal3g6NwJv9cRytg3zjVCF6Q3RHtr0S82bw= Received: from b-pb-sasl-quonix.pobox.com (unknown [127.0.0.1]) by b-sasl-quonix.pobox.com (Postfix) with ESMTP id DB08E2DF4B; Wed, 3 Jul 2013 21:52:55 +0000 (UTC) Received: from bmach.nederware.nl (unknown [27.252.247.84]) by b-sasl-quonix.pobox.com (Postfix) with ESMTPA id 01DA82DF48; Wed, 3 Jul 2013 21:52:55 +0000 (UTC) Received: from quadrio.nederware.nl (quadrio.nederware.nl [192.168.33.13]) by bmach.nederware.nl (Postfix) with ESMTP id 1D5175C55; Thu, 4 Jul 2013 09:52:48 +1200 (NZST) Received: from quadrio.nederware.nl (quadrio.nederware.nl [127.0.0.1]) by quadrio.nederware.nl (Postfix) with ESMTP id AEB1949FB971; Thu, 4 Jul 2013 09:52:52 +1200 (NZST) Date: Thu, 04 Jul 2013 09:52:52 +1200 Message-ID: <87k3l748gb.wl%berend@pobox.com> From: Berend de Boer To: Gary Palmer Subject: Re: EBS snapshot backups from a FreeBSD zfs file system: zpool freeze? In-Reply-To: <20130703200241.GB60515@in-addr.com> References: <87li5o5tz2.wl%berend@pobox.com> <87ehbg5raq.wl%berend@pobox.com> <20130703055047.GA54853@icarus.home.lan> <6488DECC-2455-4E92-B432-C39490D18484@dragondata.com> <871u7g57rl.wl%berend@pobox.com> <87mwq34emp.wl%berend@pobox.com> <20130703200241.GB60515@in-addr.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_Thu_Jul__4_09:52:52_2013-1"; micalg=pgp-sha256; protocol="application/pgp-signature" Content-Transfer-Encoding: 7bit X-Pobox-Relay-ID: EA991424-E42A-11E2-B469-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 21:52:57 -0000 --pgp-sign-Multipart_Thu_Jul__4_09:52:52_2013-1 Content-Type: text/plain; charset=US-ASCII >>>>> "Gary" == Gary Palmer writes: Gary> Other than using SAN (FC or iSCSI), I know of no reason to Gary> do backups at the raw disk level, nor any real demand. Probably the hundreds of thousands of businesses that use Amazon AWS disagree :-) Gary> I've worked with people who have done LUN based backups in Gary> the past and they have one drawback - they tend to back up Gary> the entire LUN, irrespective of whether it is an allocated Gary> block or not. Modern systems that implement some kind of Gary> TRIM emulation (or cheat and sniff the filesystem block Gary> allocation maps) may alleviate that problem. That's not how EBS does a back up. It only backs up allocated blocks for the first time, and for subsequent backups only back up the changed blocks. Gary> However, in the vast majority of cases, people back up from Gary> above the FS, not below. This makes your use case probably Gary> more tied to EBS than you may otherwise think. People generally didn't have a choice I would say. Now millions of servers run on top of block storage. Disks are just software. That's the new world. -- All the best, Berend de Boer ------------------------------------------------------ Awesome Drupal hosting: https://www.xplainhosting.com/ --pgp-sign-Multipart_Thu_Jul__4_09:52:52_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) iQIcBAABCAAGBQJR1J00AAoJEKOfeD48G3g5bX4P/1+APTOza9rSnUxMeihQSB2m EQAGuUgYJu3YuLKuzPwxIVuSaCVJDOMaPPbTvam0WUNJ4RQtXoBOwOi+/J7ebFlC PAifLVm+/4P7a4QABFwXGFFn9igBfOB9U9yhMIlqoI/vYqcpbnfmr6h9WxfFTyGv 5bIUwQg7CaSMigajvefBl7C6tXWcAkR3qbyNQhGWluCg3HEu4GRhvPfOHLKN8Rcs KvirmL0TaswDoWmHXoOHgGBFKTyht2I0+BOcfxQOETAYz087IzV14sWSNSruRip7 mr/Cap/V7PAfHqmjZZ0N1BuW+P4ETQLlkGySK18cB4swLdk4gRGY6/e1jZLhet3w nr9KafFoo+6bRchn90z6JxFQ6GnzNkmajPJE8B2ISTsu0fDc6And9aArXxgJctV1 N0IlbmUX+o6adCD2uElpU0Nu2tLcR8DEzQCxDGMK74er7QuS3mTAWOinVu9gq76s pAQtBmWRGupalDHv8Mpr0Q88GHEbi2wQVMphIzlduzBN/uNiScIExy+Xw/O9hFM0 SauhFv/Sqe9p/wKerUNH+2v5cuATtj60OMEhpsOzhs/vxquCr+Qyb6xyfrjPynG+ /aM0cQUsddelL942Hd1esUCRbVO82t+YZmRW8tXLDj9w1uXIiaIFm1qrn8UF1N0A TpJMSBL0BgCy5gh6oPGP =IIWr -----END PGP SIGNATURE----- --pgp-sign-Multipart_Thu_Jul__4_09:52:52_2013-1--