Return-Path: X-Original-To: apmail-cassandra-user-archive@www.apache.org Delivered-To: apmail-cassandra-user-archive@www.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 86D916FBA for ; Thu, 19 May 2011 00:38:24 +0000 (UTC) Received: (qmail 88391 invoked by uid 500); 19 May 2011 00:38:22 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 88366 invoked by uid 500); 19 May 2011 00:38:22 -0000 Mailing-List: contact user-help@cassandra.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: user@cassandra.apache.org Delivered-To: mailing list user@cassandra.apache.org Received: (qmail 88358 invoked by uid 99); 19 May 2011 00:38:22 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 19 May 2011 00:38:22 +0000 X-ASF-Spam-Status: No, hits=1.5 required=5.0 tests=FREEMAIL_FROM,HTML_MESSAGE,RCVD_IN_DNSWL_LOW,RFC_ABUSE_POST,SPF_PASS,T_TO_NO_BRKTS_FREEMAIL X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: domain of cassandralabs@gmail.com designates 209.85.214.172 as permitted sender) Received: from [209.85.214.172] (HELO mail-iw0-f172.google.com) (209.85.214.172) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 19 May 2011 00:38:16 +0000 Received: by iwn39 with SMTP id 39so2206775iwn.31 for ; Wed, 18 May 2011 17:37:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:date:message-id:subject:from:to :content-type; bh=eNtLuqLnZnwwdHIBPqL8iAPf4OA7cfo6nw5YiY23mUc=; b=bi7JDat2wn5S1bRTwmNNyReoGrfnd+7Si7fcYyoSuiq3mzA4PFnMnhDGgteLv0Lynu gBLAuGFlBP0aeKi1+eIeN/Z0RX1wxBad1B7ECnezAypuA0YkewAv2uzHRRQ3uMVgblk6 gXY+jC/RMMzp4oZOASFb7z3kjlQHlNJPS85qY= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type; b=fk/421WqqOYWU1iExO5+bjdDQwkb85toEpsdLlz1ECazqCVRsGpHSODsFp3LGxAHSV j/Og3x1AjevO6X7sLXS3A/uh1OX+3hoTCBam/Kx/At6lL+MvW15GYzckHopTStqsqEuR Nnkw8uv/Qa46McZUiZAbxcUi+R/BEFQ2SktlE= MIME-Version: 1.0 Received: by 10.231.139.202 with SMTP id f10mr2014103ibu.36.1305765475640; Wed, 18 May 2011 17:37:55 -0700 (PDT) Received: by 10.231.211.142 with HTTP; Wed, 18 May 2011 17:37:55 -0700 (PDT) Date: Wed, 18 May 2011 17:37:55 -0700 Message-ID: Subject: Snapshotting to a different volume? From: Sameer Farooqui To: user@cassandra.apache.org Content-Type: multipart/alternative; boundary=0016e64608aa55e60904a3963701 --0016e64608aa55e60904a3963701 Content-Type: text/plain; charset=ISO-8859-1 As of 0.8.0, is it possible to take a Cassandra snapshot to a different volume (like a EBS volume dedicated for backups)? About a year ago, Jonathan Ellis said that this won't be implemented b/c snapshots are basically hard links: http://mail-archives.apache.org/mod_mbox/cassandra-commits/201002.mbox/%3C821546961.221891265939548009.JavaMail.jira@brutus.apache.org%3E But I don't fully understand that. If a snapshot is just a hardlink, won't the snapshot also change as new data is written to the SSTables? - Sameer --0016e64608aa55e60904a3963701 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable As of 0.8.0, is it possible to take a Cassandra snapshot to a different vol= ume (like a EBS volume dedicated for backups)?

About a y= ear ago, Jonathan Ellis said that this won't be implemented b/c snapsho= ts are basically hard links:

http://mail-archives.apache.org/mod_mbox/cassandra-commits/201002.mbox= /%3C821546961.221891265939548009.JavaMail.jira@brutus.apache.org%3E

But I don't fully understand that. If a snapshot is= just a hardlink, won't the snapshot also change as new data is written= to the SSTables?

- Sameer

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