Return-Path: Delivered-To: apmail-cassandra-user-archive@www.apache.org Received: (qmail 26239 invoked from network); 7 Feb 2011 21:25:27 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.3) by minotaur.apache.org with SMTP; 7 Feb 2011 21:25:27 -0000 Received: (qmail 3328 invoked by uid 500); 7 Feb 2011 21:25:25 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 3281 invoked by uid 500); 7 Feb 2011 21:25:24 -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 3273 invoked by uid 99); 7 Feb 2011 21:25:24 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 07 Feb 2011 21:25:24 +0000 X-ASF-Spam-Status: No, hits=-0.0 required=5.0 tests=RCVD_IN_DNSWL_LOW,SPF_NEUTRAL X-Spam-Check-By: apache.org Received-SPF: neutral (nike.apache.org: local policy) Received: from [209.85.218.44] (HELO mail-yi0-f44.google.com) (209.85.218.44) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 07 Feb 2011 21:25:15 +0000 Received: by yie19 with SMTP id 19so2196922yie.31 for ; Mon, 07 Feb 2011 13:24:53 -0800 (PST) MIME-Version: 1.0 Received: by 10.151.150.4 with SMTP id c4mr5687797ybo.169.1297113748911; Mon, 07 Feb 2011 13:22:28 -0800 (PST) Sender: scode@scode.org Received: by 10.151.79.21 with HTTP; Mon, 7 Feb 2011 13:22:28 -0800 (PST) X-Originating-IP: [213.114.157.84] In-Reply-To: References: Date: Mon, 7 Feb 2011 22:22:28 +0100 X-Google-Sender-Auth: N9NyXCQnXFgRXcFDRwn3LsUDNHY Message-ID: Subject: Re: Best way to detect/fix bitrot today? From: Peter Schuller To: user@cassandra.apache.org Content-Type: text/plain; charset=UTF-8 X-Virus-Checked: Checked by ClamAV on apache.org > Some RAID storage might do it, potentially more efficiently!! People keep claiming that but I have yet to confirm that a hardware raid does actual checksumming as opposed to just healing bad blocks. But yes, they might :) > Food for thought, or wild imagination ? That was my intent. Checksumming at the sstable level would allow detection of corruption, and regular repair and read-repair would provide self-healing. -- / Peter Schuller