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 302FB40ED for ; Wed, 29 Jun 2011 12:37:03 +0000 (UTC) Received: (qmail 16103 invoked by uid 500); 29 Jun 2011 12:37:01 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 15949 invoked by uid 500); 29 Jun 2011 12:37:00 -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 15941 invoked by uid 99); 29 Jun 2011 12:37:00 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 29 Jun 2011 12:37:00 +0000 X-ASF-Spam-Status: No, hits=2.2 required=5.0 tests=HTML_MESSAGE,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: domain of Arun.Jacob@disney.com designates 204.128.192.36 as permitted sender) Received: from [204.128.192.36] (HELO msg2.disney.com) (204.128.192.36) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 29 Jun 2011 12:36:51 +0000 Received: from int1.disney.pvt (int1.disney.pvt [153.7.110.9]) by msg2.disney.com (Switch-3.4.3/Switch-3.4.3) with ESMTP id p5TCaVoM002438 for ; Wed, 29 Jun 2011 12:36:31 GMT Received: from sm-cala-xht03.swna.wdpr.disney.com (SM-CALA-XHT03.swna.wdpr.disney.com [153.7.248.18]) by int1.disney.pvt (Switch-3.4.3/Switch-3.4.3) with ESMTP id p5TCaUX8007295 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL) for ; Wed, 29 Jun 2011 12:36:31 GMT Received: from sm-cala-vxmb06b.swna.wdpr.disney.com ([fe80::dc83:6937:1fbe:7ff1]) by sm-cala-xht03.swna.wdpr.disney.com ([2002:9907:f812::9907:f812]) with mapi; Wed, 29 Jun 2011 05:36:30 -0700 From: "Jacob, Arun" To: "user@cassandra.apache.org" Date: Wed, 29 Jun 2011 05:36:30 -0700 Subject: question on capacity planning Thread-Topic: question on capacity planning Thread-Index: Acw2WSvCV1P7nQVLQkCGx5qh/kWMgg== Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/14.12.0.110505 acceptlanguage: en-US Content-Type: multipart/alternative; boundary="_000_CA3048D6191E9arunjacobemaildisneycom_" MIME-Version: 1.0 X-Source-IP: SM-CALA-XHT03.swna.wdpr.disney.com [153.7.248.18] --_000_CA3048D6191E9arunjacobemaildisneycom_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable if I'm planning to store 20TB of new data per week, and expire all data eve= ry 2 weeks, with a replication factor of 3, do I only need approximately 12= 0 TB of disk? I'm going to use ttl in my column values to automatically exp= ire data. Or would I need more capacity to handle sstable merges? Given thi= s amount of data, would you recommend node storage at 2TB per node or more?= This application will have a heavy write /moderate read use profile. -- Arun --_000_CA3048D6191E9arunjacobemaildisneycom_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

if I'm planning to store= 20TB of new data per week, and expire all data every 2 weeks, with a repli= cation factor of 3, do I only need approximately 120 TB of disk? I'm going = to use ttl in my column values to automatically expire data. Or would I nee= d more capacity to handle sstable merges? Given this amount of data, would = you recommend node storage at 2TB per node or more? This application will h= ave a heavy write /moderate read use profile.

-- Arun --_000_CA3048D6191E9arunjacobemaildisneycom_--