From user-return-34463-apmail-cassandra-user-archive=cassandra.apache.org@cassandra.apache.org Wed Jun 5 13:12:28 2013 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 BC8BE1023E for ; Wed, 5 Jun 2013 13:12:28 +0000 (UTC) Received: (qmail 52038 invoked by uid 500); 5 Jun 2013 13:12:26 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 51816 invoked by uid 500); 5 Jun 2013 13:12:25 -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 51808 invoked by uid 99); 5 Jun 2013 13:12:24 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 05 Jun 2013 13:12:24 +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 (athena.apache.org: domain of chris.wirt@struq.com designates 209.85.215.178 as permitted sender) Received: from [209.85.215.178] (HELO mail-ea0-f178.google.com) (209.85.215.178) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 05 Jun 2013 13:12:19 +0000 Received: by mail-ea0-f178.google.com with SMTP id q15so1187844ead.9 for ; Wed, 05 Jun 2013 06:11:58 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=from:to:references:in-reply-to:subject:date:message-id:mime-version :content-type:x-mailer:thread-index:content-language :x-gm-message-state; bh=iR15EpgDybV4uugCK2S04eGW25TpXIK9xkSrJtTUmi4=; b=p4uaFAB4b1mJjSQESg2eh3GvoNcNXgCKSN/cJvKjp4KLVZ/NCWEzjexKT9aprcTa8v 17lXD13b4E1XsqcUjI/0groYaWHSDYB5xgs1D744KzgvAZpNgAeSZlj8xjKrPdtG6w5y fX9+8ud5X0OgqUx+DwmbYcHHXbB8Wd0rrWCYgySxl+V++UDmSy8M28Fpgxlmgm9ZClJd msYiraV/gEGII0UkTQNHM1TNL+e3pY82drWZpMPS3LnQdfROvo2TMRF3F2s/3roIAmSw lIrVUGKc7EGLzN8drxInCHb/2o+0HSR5ElRWMIlHHz9WMeE8JzY9Mf/gHXdvQtDuffke N/2g== X-Received: by 10.14.172.195 with SMTP id t43mr29162484eel.34.1370437917903; Wed, 05 Jun 2013 06:11:57 -0700 (PDT) Received: from StevePereiraPC (46-65-46-17.zone16.bethere.co.uk. [46.65.46.17]) by mx.google.com with ESMTPSA id l6sm97666765eef.12.2013.06.05.06.11.56 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Wed, 05 Jun 2013 06:11:57 -0700 (PDT) From: "Christopher Wirt" To: References: <007801ce61cf$aaafde20$000f9a60$@struq.com> In-Reply-To: Subject: RE: Multiple JBOD data directory Date: Wed, 5 Jun 2013 14:11:56 +0100 Message-ID: <00fa01ce61ee$41739e50$c45adaf0$@struq.com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00FB_01CE61F6.A33A7750" X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQNWjLGy9cvow5a1ncRz1f7cx1z95QFXmjC6lgwERuA= Content-Language: en-gb X-Gm-Message-State: ALoCoQmDcclwGIKc4QOA159BXUZP5ruuhWOkJHK/K6bPH8zWYocVdIVDGR7qoqMRgNi10ThhY+DJ X-Virus-Checked: Checked by ClamAV on apache.org This is a multipart message in MIME format. ------=_NextPart_000_00FB_01CE61F6.A33A7750 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit I would hope so. Just trying to get some confirmation from someone with production experience. Thanks for your reply From: Shahab Yunus [mailto:shahab.yunus@gmail.com] Sent: 05 June 2013 13:31 To: user@cassandra.apache.org Subject: Re: Multiple JBOD data directory Though, I am a newbie bust just had a thought regarding your question 'How will it handle requests for data which unavailable?', wouldn't the data be served in that case from other nodes where it has been replicated? Regards, Shahab On Wed, Jun 5, 2013 at 5:32 AM, Christopher Wirt wrote: Hello, We're thinking about using multiple data directories each with its own disk and are currently testing this against a RAID0 config. I've seen that there is failure handling with multiple JBOD. e.g. We have two data directories mounted to separate drives /disk1 /disk2 One of the drives fails Will Cassandra continue to work? How will it handle requests for data which unavailable? If I want to add an additional drive what is the best way to go about redistributing the data? Thanks, Chris ------=_NextPart_000_00FB_01CE61F6.A33A7750 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

I would hope so. Just trying to get some confirmation from someone = with production experience.

 

Thanks for your reply

 

From:= Shahab = Yunus [mailto:shahab.yunus@gmail.com]
Sent: 05 June 2013 = 13:31
To: user@cassandra.apache.org
Subject: Re: = Multiple JBOD data directory

 

Though, = I am a newbie bust just had a thought regarding your question 'How will it = handle requests for data which unavailable?', wouldn't the data be = served in that case from other nodes where it has been = replicated?

 

Regards,

Shahab=

 

On Wed, Jun 5, 2013 at 5:32 AM, Christopher Wirt = <chris.wirt@struq.com> = wrote:

Hello, =

 <= /o:p>

We’re = thinking about using multiple data directories each with its own disk = and are currently testing this against a RAID0 config.

 <= /o:p>

I’ve = seen that there is failure handling with multiple JBOD.

 <= /o:p>

e.g. =

We have two = data directories mounted to separate drives

/disk1<= /o:p>

/disk2<= /o:p>

One of the = drives fails

 <= /o:p>

Will = Cassandra continue to work?

How will it = handle requests for data which unavailable?

If I want = to add an additional drive what is the best way to go about = redistributing the data?

 <= /o:p>

Thanks,=

Chris

 

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