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	<title>FamousPhil.com Admin Blog and More &#187; dynamic</title>
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		<title>Dynamic Disk Spans in Server 2003 will kill performance</title>
		<link>http://famousphil.com/blog/2009/03/dynamic-disk-spans-in-server-2003-will-kill-performance/</link>
		<comments>http://famousphil.com/blog/2009/03/dynamic-disk-spans-in-server-2003-will-kill-performance/#comments</comments>
		<pubDate>Tue, 24 Mar 2009 16:49:05 +0000</pubDate>
		<dc:creator>Famous Phil</dc:creator>
				<category><![CDATA[Hosting / Server Administration]]></category>
		<category><![CDATA[2003]]></category>
		<category><![CDATA[disk]]></category>
		<category><![CDATA[dynamic]]></category>
		<category><![CDATA[dynamic volume]]></category>
		<category><![CDATA[server]]></category>
		<category><![CDATA[span]]></category>
		<category><![CDATA[x64]]></category>

		<guid isPermaLink="false">http://famousphil.com/blog/?p=51</guid>
		<description><![CDATA[About 3 weeks ago when I was building a new server, I put 2 identical SATA drives in the server (500GB each), each capable of 60MB/s transfer when clocked.  I had a fair amount of data (250GB) to share on these 2 drives.  I normally would opt for a raid mirror (hardware based mirror), however [...]]]></description>
			<content:encoded><![CDATA[<p>About 3 weeks ago when I was building a new server, I put 2 identical SATA drives in the server (500GB each), each capable of 60MB/s transfer when clocked.  I had a fair amount of data (250GB) to share on these 2 drives.  I normally would opt for a raid mirror (hardware based mirror), however I have this data backed up else where, so I decided that I would combine the disks using a span to make a 1TB partition.</p>
<p>I transferred the data to the partition in 2 days and really thought nothing of it because I was busy with other stuff.  However when I got back to college with this server, I found that most of my local file operations would take 10 times longer than they should take.</p>
<p>Therefore, I decided to ditch the span.  To copy all of the data off the span took 4 days to an external hard drive (capable of 20MB/s).  To copy from the external to a simple dynamic volume took a little under 2 hours.  This proves to me that spans just plain suck.  I&#8217;m now using just 1 disk and use the other as a weekly backup disk.</p>
<p>I did discover after a little research that Windows treats spanned and stripped volumes differently although they both combine physical disks to make bigger partitions.  Windows NTFS (NT File System) has a 2TB physical limit that it can handle, and NTFS starts becomming inefficient after 500GB to 1TB.  Since a span treats 2 physical disks as 1 physical disk, this explains the slow down.</p>
<p>However, I did learn that a stripped volume will treat each disk as a separate disk and combine the storage into 1 logical partition.  I have yet to try this with another disk and I may comment on this if I ever try using a stripped volume.</p>
<p>The bottom line is, you will have a major performance problem under server 2003 x64 bit if you opt for a spanned dynamic disk, not to mention 20 to 30 server crashes while getting your data off to undo it.</p>
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