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 4BB85DBB6 for ; Wed, 8 Aug 2012 13:01:53 +0000 (UTC) Received: (qmail 70622 invoked by uid 500); 8 Aug 2012 13:01:51 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 70555 invoked by uid 500); 8 Aug 2012 13:01:51 -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 70546 invoked by uid 99); 8 Aug 2012 13:01:51 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 08 Aug 2012 13:01:51 +0000 X-ASF-Spam-Status: No, hits=-2.3 required=5.0 tests=RCVD_IN_DNSWL_MED,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: local policy) Received: from [192.174.58.134] (HELO XEDGEA.nrel.gov) (192.174.58.134) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 08 Aug 2012 13:01:44 +0000 Received: from XHUBB.nrel.gov (10.20.4.59) by XEDGEA.nrel.gov (192.174.58.134) with Microsoft SMTP Server (TLS) id 8.3.245.1; Wed, 8 Aug 2012 07:01:12 -0600 Received: from MAILBOX2.nrel.gov ([fe80::19a0:6c19:6421:12f]) by XHUBB.nrel.gov ([::1]) with mapi; Wed, 8 Aug 2012 07:01:23 -0600 From: "Hiller, Dean" To: "user@cassandra.apache.org" Date: Wed, 8 Aug 2012 07:01:22 -0600 Subject: Re: Use of SSD for commitlog Thread-Topic: Use of SSD for commitlog Thread-Index: Ac11ZemW1fK7FAx5SQ2FnSEzQ7CJlw== Message-ID: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/14.2.3.120616 acceptlanguage: en-US Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Virus-Checked: Checked by ClamAV on apache.org Probably not since it is sequential writes=85.(ie. Seek performance is the = big hit and if it is sequential it should not be seeking and is about just = as fast as an SSD in theory). In practice, I have not measure the performa= nce of one vs. the other though=85that I always the best way to go.(you cou= ld write a micro benchmark test with warmup writes and then stream writes t= o and see how it does without cassandra). Dean From: Darvin Denmian > Reply-To: "user@cassandra.apache.org" > Date: Tuesday, August 7, 2012 8:34 PM To: "user@cassandra.apache.org" > Subject: Use of SSD for commitlog Hi, Can somebody tell me if is there some benefit in use SSD Disks for commitlog? THanks!