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	<title>Linux Magazine &#187; Datacenter</title>
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	<link>http://www.linux-mag.com</link>
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		<title>Extended File Attributes Rock!</title>
		<link>http://www.linux-mag.com/id/8741/</link>
		<comments>http://www.linux-mag.com/id/8741/#comments</comments>
		<pubDate>Wed, 29 Jun 2011 20:42:11 +0000</pubDate>
		<dc:creator>Jeffrey Layton</dc:creator>
				<category><![CDATA[Datacenter]]></category>
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		<guid isPermaLink="false">http://www.linux-mag.com/?p=8741</guid>
		<description><![CDATA[Worldwide, data is growing at a tremendous rate. However, one recent study has pointed out that the size of files is not necessarily growing at the same rate; meaning the number of files is growing rapidly. How do we manage all of this data and files? While the answer to that question is complex, one place we can start is with Extended File Attributes. <a href="http://www.linux-mag.com/id/8741/">Continue reading <span class="meta-nav">&#8594;</span></a>]]></description>
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		<slash:comments>10</slash:comments>
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		<title>Checksumming Files to Find Bit-Rot</title>
		<link>http://www.linux-mag.com/id/8794/</link>
		<comments>http://www.linux-mag.com/id/8794/#comments</comments>
		<pubDate>Tue, 28 Jun 2011 20:57:12 +0000</pubDate>
		<dc:creator>Jeffrey Layton</dc:creator>
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		<guid isPermaLink="false">http://www.linux-mag.com/?p=8794</guid>
		<description><![CDATA[In a previous article</a> extended file attributes were presented. These are additional bits of metadata that are tied to the file and can be used in a variety of ways. One of these ways is to add checksums to the file so that corrupted data can be detected. Let's take a look at how we can do this including some simple Python examples. <a href="http://www.linux-mag.com/id/8794/">Continue reading <span class="meta-nav">&#8594;</span></a>]]></description>
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		<slash:comments>24</slash:comments>
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		<title>What&#8217;s an inode?</title>
		<link>http://www.linux-mag.com/id/8658/</link>
		<comments>http://www.linux-mag.com/id/8658/#comments</comments>
		<pubDate>Thu, 09 Jun 2011 13:37:25 +0000</pubDate>
		<dc:creator>Jeffrey Layton</dc:creator>
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		<guid isPermaLink="false">http://www.linux-mag.com/?p=8658</guid>
		<description><![CDATA[As you might have noticed, we love talking about file systems. In these discussions the term "inode" is often thrown about. But what is an inode and how does it relate to a file system? Glad you asked.  <a href="http://www.linux-mag.com/id/8658/">Continue reading <span class="meta-nav">&#8594;</span></a>]]></description>
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		<slash:comments>58</slash:comments>
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		<title>SandForce 1222 SSD Testing, Part 5: Detailed Throughput and IOPS Analysis with a 2.6.38.2 Kernel</title>
		<link>http://www.linux-mag.com/id/8698/</link>
		<comments>http://www.linux-mag.com/id/8698/#comments</comments>
		<pubDate>Tue, 07 Jun 2011 13:51:18 +0000</pubDate>
		<dc:creator>Jeffrey Layton</dc:creator>
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		<guid isPermaLink="false">http://www.linux-mag.com/?p=8698</guid>
		<description><![CDATA[In this series we've been working over the 2.6.32 kernel, which is a bit old. Let's kick the tires on a 2.6.38.2 kernel to see if it helps or hurts performance of the SandForce SSD.  <a href="http://www.linux-mag.com/id/8698/">Continue reading <span class="meta-nav">&#8594;</span></a>]]></description>
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		<slash:comments>48</slash:comments>
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		<title>iotop: Per Process I/O Usage</title>
		<link>http://www.linux-mag.com/id/8366/</link>
		<comments>http://www.linux-mag.com/id/8366/#comments</comments>
		<pubDate>Thu, 19 May 2011 05:01:57 +0000</pubDate>
		<dc:creator>Jeffrey Layton</dc:creator>
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		<guid isPermaLink="false">http://www.linux-mag.com/?p=8366</guid>
		<description><![CDATA[Based on a reader comment, we take iotop for a spin to see if it can be used for monitoring the IO usage of individual processes on a system. The result? It has some interesting capability that we haven't found in other tools. <a href="http://www.linux-mag.com/id/8366/">Continue reading <span class="meta-nav">&#8594;</span></a>]]></description>
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		<slash:comments>13</slash:comments>
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		<title>SandForce 1222 SSD Testing, Part 4: Detailed IOPS Analysis</title>
		<link>http://www.linux-mag.com/id/8592/</link>
		<comments>http://www.linux-mag.com/id/8592/#comments</comments>
		<pubDate>Mon, 09 May 2011 21:40:31 +0000</pubDate>
		<dc:creator>Jeffrey Layton</dc:creator>
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		<guid isPermaLink="false">http://www.linux-mag.com/?p=8592</guid>
		<description><![CDATA[In this installment of our series examining the performance of SandForce-based consumer SSDs we dig into the IOPS performance of the drive. How does it stand up to an enterprise-class SSD? Let's find out.  <a href="http://www.linux-mag.com/id/8592/">Continue reading <span class="meta-nav">&#8594;</span></a>]]></description>
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		<slash:comments>2</slash:comments>
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		<title>SandForce 1222 SSD Testing, Part 3: Detailed Throughput Analysis</title>
		<link>http://www.linux-mag.com/id/8574/</link>
		<comments>http://www.linux-mag.com/id/8574/#comments</comments>
		<pubDate>Mon, 09 May 2011 03:24:02 +0000</pubDate>
		<dc:creator>Jeffrey Layton</dc:creator>
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		<guid isPermaLink="false">http://www.linux-mag.com/?p=8574</guid>
		<description><![CDATA[Our last two articles have presented an initial performance examination of a consumer SandForce based SSD from a throughput and IOPS perspective. In this article we dive deeper into the throughput performance of the drive, along with a comparison to an Intel X-25E SSD. I think you will be surprised at what is discovered. <a href="http://www.linux-mag.com/id/8574/">Continue reading <span class="meta-nav">&#8594;</span></a>]]></description>
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		<slash:comments>2</slash:comments>
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		<title>SandForce 1222 SSD Testing &#8211; Part 2: Initial IOPS Results</title>
		<link>http://www.linux-mag.com/id/8510/</link>
		<comments>http://www.linux-mag.com/id/8510/#comments</comments>
		<pubDate>Fri, 29 Apr 2011 03:55:53 +0000</pubDate>
		<dc:creator>Jeffrey Layton</dc:creator>
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		<guid isPermaLink="false">http://www.linux-mag.com/?p=8510</guid>
		<description><![CDATA[SandForce has developed a very interesting and unique SSD controller that uses real-time data compression. This affects data throughput and SSD longevity. In this article, we perform an initial examination of the IOPS performance of a SandForce 1222-based SSD. The results can be pretty amazing. <a href="http://www.linux-mag.com/id/8510/">Continue reading <span class="meta-nav">&#8594;</span></a>]]></description>
		<wfw:commentRss>http://www.linux-mag.com/id/8510/feed/</wfw:commentRss>
		<slash:comments>3</slash:comments>
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		<title>SandForce 1222 SSD Testing, Part 1: Initial Throughput Results</title>
		<link>http://www.linux-mag.com/id/8477/</link>
		<comments>http://www.linux-mag.com/id/8477/#comments</comments>
		<pubDate>Fri, 01 Apr 2011 05:38:13 +0000</pubDate>
		<dc:creator>Jeffrey Layton</dc:creator>
				<category><![CDATA[Datacenter]]></category>
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		<guid isPermaLink="false">http://www.linux-mag.com/?p=8477</guid>
		<description><![CDATA[SandForce has developed a very interesting and unique SSD controller that uses real-time data compression. This can improve performance (throughput) and extend the life of the SSD but it hinges upon the compressibility of your data. This article is the first part in a series that examines the performance of a SandForce 1222-based SSD and the impact of data compressibility.  <a href="http://www.linux-mag.com/id/8477/">Continue reading <span class="meta-nav">&#8594;</span></a>]]></description>
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		<slash:comments>11</slash:comments>
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		<title>Software RAID on Linux with mdadm</title>
		<link>http://www.linux-mag.com/id/7939/</link>
		<comments>http://www.linux-mag.com/id/7939/#comments</comments>
		<pubDate>Tue, 29 Mar 2011 17:50:21 +0000</pubDate>
		<dc:creator>Jeffrey Layton</dc:creator>
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		<guid isPermaLink="false">http://www.linux-mag.com/?p=7939</guid>
		<description><![CDATA[Now that we've completed our initial examination of the basics of RAID levels (including Nested RAID) it's time to turn our attention to RAID functionality on Linux using software. In this article we will be discussing mdadm -- the software RAID administration tool for Linux. It comes with virtually every Linux distribution and has some unique features that many hardware RAID cards don't. <a href="http://www.linux-mag.com/id/7939/">Continue reading <span class="meta-nav">&#8594;</span></a>]]></description>
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		<slash:comments>5</slash:comments>
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		<title>Aligning SSD Partitions</title>
		<link>http://www.linux-mag.com/id/8397/</link>
		<comments>http://www.linux-mag.com/id/8397/#comments</comments>
		<pubDate>Wed, 16 Mar 2011 22:53:05 +0000</pubDate>
		<dc:creator>Jeffrey Layton</dc:creator>
				<category><![CDATA[Datacenter]]></category>
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		<guid isPermaLink="false">http://www.linux-mag.com/?p=8397</guid>
		<description><![CDATA[Do you have a brand new SSD? Do you plan to partition it? Let's talk about the best way to set up your SSD so partitions -- and the resulting file systems -- align on page boundaries, thus improving performance and minimizing the number of rewrite cycles. <a href="http://www.linux-mag.com/id/8397/">Continue reading <span class="meta-nav">&#8594;</span></a>]]></description>
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		<slash:comments>15</slash:comments>
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		<title>Nested-RAID: The Triple Lindy</title>
		<link>http://www.linux-mag.com/id/7932/</link>
		<comments>http://www.linux-mag.com/id/7932/#comments</comments>
		<pubDate>Tue, 01 Mar 2011 20:53:30 +0000</pubDate>
		<dc:creator>Jeffrey Layton</dc:creator>
				<category><![CDATA[Datacenter]]></category>
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		<guid isPermaLink="false">http://www.linux-mag.com/?p=7932</guid>
		<description><![CDATA[Thus far we have talked about single-level RAID configurations and Nested RAID configurations. But we've artificially restricted ourselves to only two levels in Nested RAID. Couldn't we have three RAID levels or more? The answer is yes, and in this article we'll talk about three levels (the proverbial "Triple Lindy") and have some fun with a couple of examples. <a href="http://www.linux-mag.com/id/7932/">Continue reading <span class="meta-nav">&#8594;</span></a>]]></description>
		<wfw:commentRss>http://www.linux-mag.com/id/7932/feed/</wfw:commentRss>
		<slash:comments>9</slash:comments>
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		<title>Tools for Storage Monitoring: nfsiostat</title>
		<link>http://www.linux-mag.com/id/7919/</link>
		<comments>http://www.linux-mag.com/id/7919/#comments</comments>
		<pubDate>Thu, 24 Feb 2011 16:30:31 +0000</pubDate>
		<dc:creator>Jeffrey Layton</dc:creator>
				<category><![CDATA[Datacenter]]></category>
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		<guid isPermaLink="false">http://www.linux-mag.com/?p=7919</guid>
		<description><![CDATA[In our never ending-quest for reasonable storage management and monitoring tools, we examine a simple tool in the sysstat collection: nfsiostat. Coupled with iostat, the combination creates a nice set of tools for monitoring NFS. <a href="http://www.linux-mag.com/id/7919/">Continue reading <span class="meta-nav">&#8594;</span></a>]]></description>
		<wfw:commentRss>http://www.linux-mag.com/id/7919/feed/</wfw:commentRss>
		<slash:comments>4</slash:comments>
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		<title>On-the-fly Data Compression for SSDs</title>
		<link>http://www.linux-mag.com/id/7869/</link>
		<comments>http://www.linux-mag.com/id/7869/#comments</comments>
		<pubDate>Wed, 23 Feb 2011 00:02:11 +0000</pubDate>
		<dc:creator>Jeffrey Layton</dc:creator>
				<category><![CDATA[Datacenter]]></category>
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		<guid isPermaLink="false">http://www.linux-mag.com/?p=7869</guid>
		<description><![CDATA[The key to good SSD performance is the controller. One SSD controller that has received good reviews is the SandForce SF-1200. However, a recent test of a SF-1200 SSD reveals some interesting things about what this controller does and just how it does it. Depending upon your point of view and, radically, your data, performance can be amazing. <a href="http://www.linux-mag.com/id/7869/">Continue reading <span class="meta-nav">&#8594;</span></a>]]></description>
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		<slash:comments>28</slash:comments>
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		<title>3TB Drives are Here</title>
		<link>http://www.linux-mag.com/id/7897/</link>
		<comments>http://www.linux-mag.com/id/7897/#comments</comments>
		<pubDate>Wed, 16 Feb 2011 15:47:59 +0000</pubDate>
		<dc:creator>Jeffrey Layton</dc:creator>
				<category><![CDATA[Datacenter]]></category>
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		<guid isPermaLink="false">http://www.linux-mag.com/?p=7897</guid>
		<description><![CDATA[In real estate it's about location. In storage it's about capacity. The next crop of high density drives are available but there are some gotchas related to some 3TB drives that you need to know before making a land grab.  <a href="http://www.linux-mag.com/id/7897/">Continue reading <span class="meta-nav">&#8594;</span></a>]]></description>
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		<slash:comments>19</slash:comments>
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		<title>Short Stroking Hard Disks for Performance</title>
		<link>http://www.linux-mag.com/id/7960/</link>
		<comments>http://www.linux-mag.com/id/7960/#comments</comments>
		<pubDate>Tue, 08 Feb 2011 20:49:21 +0000</pubDate>
		<dc:creator>Bryan Richard</dc:creator>
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		<guid isPermaLink="false">http://www.linux-mag.com/id/7960/</guid>
		<description><![CDATA[Less is more. More performance, that is. Learn how to use less of your hard drive (even though you paid for all of it) to get an I/O boost. <a href="http://www.linux-mag.com/id/7960/">Continue reading <span class="meta-nav">&#8594;</span></a>]]></description>
		<wfw:commentRss>http://www.linux-mag.com/id/7960/feed/</wfw:commentRss>
		<slash:comments>19</slash:comments>
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		<title>Linux 2.6.37: Scalability Improvements Abound</title>
		<link>http://www.linux-mag.com/id/7945/</link>
		<comments>http://www.linux-mag.com/id/7945/#comments</comments>
		<pubDate>Fri, 04 Feb 2011 03:10:43 +0000</pubDate>
		<dc:creator>Jeffrey Layton</dc:creator>
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		<guid isPermaLink="false">http://www.linux-mag.com/id/7945/</guid>
		<description><![CDATA[While 2.6.37 might be considered a quiet release,  there are some very nice scalability improvements for file systems and one cool new feature that warrant a review. <a href="http://www.linux-mag.com/id/7945/">Continue reading <span class="meta-nav">&#8594;</span></a>]]></description>
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		<slash:comments>2</slash:comments>
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		<title>Nested-RAID: RAID-5 and RAID-6 Based Configurations</title>
		<link>http://www.linux-mag.com/id/7931/</link>
		<comments>http://www.linux-mag.com/id/7931/#comments</comments>
		<pubDate>Wed, 12 Jan 2011 03:39:53 +0000</pubDate>
		<dc:creator>Jeffrey Layton</dc:creator>
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		<guid isPermaLink="false">http://www.linux-mag.com/id/7931/</guid>
		<description><![CDATA[A Nested RAID configuration is built on top of a standard single-level RAID configuration in order to address performance and data redundancy limitations. Digging deeper into Nested RAID, we check out RAID-5 and RAID-6, which have some truly amazing features (if you have enough drives). <a href="http://www.linux-mag.com/id/7931/">Continue reading <span class="meta-nav">&#8594;</span></a>]]></description>
		<wfw:commentRss>http://www.linux-mag.com/id/7931/feed/</wfw:commentRss>
		<slash:comments>2</slash:comments>
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		<title>Intro to Nested-RAID: RAID-01 and RAID-10</title>
		<link>http://www.linux-mag.com/id/7928/</link>
		<comments>http://www.linux-mag.com/id/7928/#comments</comments>
		<pubDate>Thu, 06 Jan 2011 23:49:11 +0000</pubDate>
		<dc:creator>Jeffrey Layton</dc:creator>
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		<guid isPermaLink="false">http://www.linux-mag.com/id/7928/</guid>
		<description><![CDATA[In the last article we reviewed the most basic RAID levels. In this article, we take things to the next level and discuss what is called "Nested RAID Levels". These concepts can provide both performance and redundancy for a data-rich world. We then look at RAID-01 and RAID-10; two of the most common Nested RAID configurations. <a href="http://www.linux-mag.com/id/7928/">Continue reading <span class="meta-nav">&#8594;</span></a>]]></description>
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		<slash:comments>10</slash:comments>
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		<title>Introduction to RAID</title>
		<link>http://www.linux-mag.com/id/7924/</link>
		<comments>http://www.linux-mag.com/id/7924/#comments</comments>
		<pubDate>Wed, 05 Jan 2011 04:03:59 +0000</pubDate>
		<dc:creator>Jeffrey Layton</dc:creator>
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		<guid isPermaLink="false">http://www.linux-mag.com/id/7924/</guid>
		<description><![CDATA[RAID is one of those technologies that has really revolutionized storage. In this article, we'll review the six most common single RAID levels and describe how each works and what issues surround them. <a href="http://www.linux-mag.com/id/7924/">Continue reading <span class="meta-nav">&#8594;</span></a>]]></description>
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		<slash:comments>14</slash:comments>
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