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 240CC10500 for ; Mon, 16 Sep 2013 17:06:09 +0000 (UTC) Received: (qmail 32395 invoked by uid 500); 16 Sep 2013 17:06:06 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 32357 invoked by uid 500); 16 Sep 2013 17:06:06 -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 32348 invoked by uid 99); 16 Sep 2013 17:06:05 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 16 Sep 2013 17:06:05 +0000 X-ASF-Spam-Status: No, hits=1.5 required=5.0 tests=HTML_MESSAGE,RCVD_IN_DNSWL_LOW,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (nike.apache.org: domain of rcoli@eventbrite.com designates 209.85.216.173 as permitted sender) Received: from [209.85.216.173] (HELO mail-qc0-f173.google.com) (209.85.216.173) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 16 Sep 2013 17:05:57 +0000 Received: by mail-qc0-f173.google.com with SMTP id c3so2844097qcv.18 for ; Mon, 16 Sep 2013 10:05:36 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:content-type; bh=h+pZhCkcDTJQTNJTcc+UJJXUh9/dH9ZbZN1yF8RGWzk=; b=cZAC5jLnJzHRKQFANIVXckP1OWEwcNdJBiVyMxABg/gCIvhXyt9MbB4xbEz6zyUMQF W6hFVU0DYZ7ga+O3RcPEHY38m45AzroMkT8VvtHN0ymIZV7X8z2HFZXwwffFdpn3RpdK 6hTG4NprEarGdZvmH5m4zGTXlX5L242GkXCFeWenl5eG4DsHu6vXCWsJAU5vIq2CKu2L n85gZnliqD8s+t33buuw60UVB5ei3pIYMk51p1GpljZySzzbC0d5Rgjg1yJJRHW2mZFJ HBzp3am1a3JJ0rUR5q+Zx+IyiiR6Uok3iyqdmjZ54MJTUdN3UvQcXdO3BSbDRd2sC9Pu razA== X-Gm-Message-State: ALoCoQnVDvBgieRrtWtqjoBXAmtb8SKx0er5NBs15zV4sfUTd/GduGWM2xLMhJCreGqHxuXCHIZ4 MIME-Version: 1.0 X-Received: by 10.49.75.103 with SMTP id b7mr3581249qew.85.1379351136167; Mon, 16 Sep 2013 10:05:36 -0700 (PDT) Received: by 10.49.67.70 with HTTP; Mon, 16 Sep 2013 10:05:36 -0700 (PDT) In-Reply-To: <52371EFF.4050505@gmail.com> References: <52371EFF.4050505@gmail.com> Date: Mon, 16 Sep 2013 10:05:36 -0700 Message-ID: Subject: Re: commitlog partition From: Robert Coli To: "user@cassandra.apache.org" Content-Type: multipart/alternative; boundary=047d7bd76dba7dfb9e04e68336bb X-Virus-Checked: Checked by ClamAV on apache.org --047d7bd76dba7dfb9e04e68336bb Content-Type: text/plain; charset=ISO-8859-1 On Mon, Sep 16, 2013 at 8:08 AM, Keith Freeman <8forty@gmail.com> wrote: > I'm spec'ing out some hardware for a small cassandra cluster. I know the > recommendation (v1.2+) on spinning media is to have the commitlog on a > separate physical disk from the data, but is it considered ok for > performance to put the commitlog on a partition of the OS's disk? > Separate commitlog wins when the head doesn't move between appends. Your OS will occasionally move the head to write, f/e, logs. It's probably "ok", depending on what "ok" means to you. :) =Rob --047d7bd76dba7dfb9e04e68336bb Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
On Mon, Sep 16, 2013 at 8:08 AM, Keith Freeman <8forty@g= mail.com> wrote:
I'm spec'ing out some hardware for a= small cassandra cluster. =A0I know the recommendation (v1.2+) on spinning = media is to have the commitlog on a separate physical disk from the data, b= ut is it considered ok for performance to put the commitlog on a partition = of the OS's disk?

Separate commitlog = wins when the head doesn't move between appends. Your OS will occasiona= lly move the head to write, f/e, logs. It's probably "ok", de= pending on what "ok" means to you. :)

=3DRob
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