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	<title>Stephen Foskett, Pack Rat &#187; DS5000 Archives  &#8211; Stephen Foskett, Pack Rat</title>
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	<description>Understanding the accumulation of data</description>
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		<title>Is Flash A Disk Or A Cache?</title>
		<link>http://blog.fosketts.net/2008/10/22/flash-disk-cache/</link>
		<comments>http://blog.fosketts.net/2008/10/22/flash-disk-cache/#comments</comments>
		<pubDate>Wed, 22 Oct 2008 20:01:31 +0000</pubDate>
		<dc:creator>Stephen</dc:creator>
				<category><![CDATA[Enterprise storage]]></category>
		<category><![CDATA[Virtual Storage]]></category>
		<category><![CDATA[7900]]></category>
		<category><![CDATA[CLARiiON]]></category>
		<category><![CDATA[Compellent]]></category>
		<category><![CDATA[DMX]]></category>
		<category><![CDATA[DS5000]]></category>
		<category><![CDATA[EMC]]></category>
		<category><![CDATA[Emprise]]></category>
		<category><![CDATA[Fusion-IO]]></category>
		<category><![CDATA[HDS]]></category>
		<category><![CDATA[HP]]></category>
		<category><![CDATA[IBM]]></category>
		<category><![CDATA[LSI]]></category>
		<category><![CDATA[Marvell]]></category>
		<category><![CDATA[MSA]]></category>
		<category><![CDATA[NetApp]]></category>
		<category><![CDATA[Oracle]]></category>
		<category><![CDATA[Pillar]]></category>
		<category><![CDATA[Samsung]]></category>
		<category><![CDATA[SSD]]></category>
		<category><![CDATA[STEC]]></category>
		<category><![CDATA[Sun]]></category>
		<category><![CDATA[SVC]]></category>
		<category><![CDATA[Thumper]]></category>
		<category><![CDATA[USP-V]]></category>
		<category><![CDATA[Xiotech]]></category>

		<guid isPermaLink="false">http://blog.fosketts.net/?p=938</guid>
		<description><![CDATA[There is a battle shaping up in the enterprise storage industry. On one side are those who see flash storage as an upgrade for the disk drive, and on the other are those who see it as a cache between the CPU and the drive. It&#8217;s a fundamental difference of opinion &#8211; flash chips can [...]]]></description>
			<content:encoded><![CDATA[<p><a href="http://blog.fosketts.net/wp-content/uploads/2008/10/flash-cash-disk.png" ><img style=' float: right; padding: 4px; margin: 0 0 2px 7px;'  class="alignright size-medium wp-image-942" title="flash-cash-disk" src="http://blog.fosketts.net/wp-content/uploads/2008/10/flash-cash-disk-294x300.png" alt="" width="294" height="300" /></a>There is a battle shaping up in the enterprise storage industry. On one side are those who see flash storage as an upgrade for the disk drive, and on the other are those who see it as a cache between the CPU and the drive. It&#8217;s a fundamental difference of opinion &#8211; flash chips can be used either way, and each approach has its unique benefits and drawbacks.</p>
<p>The Register <a href="http://www.theregister.co.uk/2008/10/21/storage_suppliers_adopr_ssds/"  target="_blank">did a nice job</a> of summing up the (late 2008) flash positioning of the various storage companies, and I recently posted <a href="http://blog.fosketts.net/2008/10/15/ssd-storage-where/"  target="_self">a strategic look at this core issue</a>. Note that some, like HP and Sun (and probably IBM), seem to have an end-to-end strategy, while others are firmly in one camp or the other. In the &#8220;not yet&#8221; column, apparently, are <a href="http://www.storagerap.com/2008/10/economic-downturn-to-fuel-flash-ssd-buying-rampage.html"  target="_blank"><span style="text-decoration: line-through;">3PAR</span></a>, BlueArc (though they offer TMS RAM), Dell/EqualLogic, HP/LeftHand.</p>
<p><strong>Update</strong>: <a href="http://blog.fosketts.net/2008/10/28/3par-inserve-ssd-drive/"  target="_self">3PAR has joined the &#8220;disk&#8221; camp</a>.<span id="more-938"></span></p>
<p><strong>It&#8217;s a Cache</strong></p>
<p>Fusion-IO has rocketed to the forefront of the cache side with their PCI Express flash boards for servers. Joining them in this position are the following companies:</p>
<ul>
<li>HP (blades and servers)</li>
<li>NetApp (PAM read cache card)</li>
<li>Pillar (Slammer cache)</li>
<li>Sun (read and write cache)</li>
</ul>
<p><strong>It&#8217;s a Disk</strong></p>
<p>STEC is the darling of the flash-as-a-disk world, though Intel, Marvell, and Samsung are also playing here. Joining them in the corner are the following:</p>
<ul>
<li>EMC (STEC flash drives shipping the DMX now and CLARiiON in the future)</li>
<li>Compellent (flash drives)</li>
<li>HDS (flash drives in the USP-V)</li>
<li>HP (flash drives in the MSA, perhaps, and maybe that Oracle thing)</li>
<li>IBM (Fusion-IO storage behind SVC and standard flash drives in the DS5000)</li>
<li>LSI (flash drives in the 7900)</li>
<li>NetApp (<a href="http://blogs.netapp.com/shadeofblue/2008/11/both-disk-and-c.html"  target="_blank">ssd drives</a>)</li>
<li>Pillar (flash drives)</li>
<li>Sun (flash drives in Thumper and JBOD)</li>
<li>Xiotech (flash drives in the next Emprise canisters)</li>
<li><a href="http://blog.fosketts.net/2008/10/28/3par-inserve-ssd-drive/"  target="_self">3PAR</a> (flash drives in InServe)</li>
</ul>
<p>So there you have it. It&#8217;s both a disk and a cache, depending on whether you sell servers or arrays apparently. If you sell both, it&#8217;s both. Simple!</p>
<p>If anyone wants to correct any of this, drop me a line or comment below!</p>
<blockquote><p>See my posts on <a href="http://gestaltit.com/author/stephen/"  target="_blank">Gestalt IT</a> for similar <a href="http://gestaltit.com"  target="_blank">enterprise IT infrastructure commentary</a></p>
</blockquote>
<div id="crp_related"><h3>You might also want to read these other posts...</h3><ul><li><a href="http://blog.fosketts.net/2008/10/28/3par-inserve-ssd-drive/"  rel="bookmark" class="crp_title">3PAR Reserves A Seat At The Solid State Disk Drive Table</a></li><li><a href="http://blog.fosketts.net/2010/05/17/hybrid-ssd-hard-disk-drives/"  rel="bookmark" class="crp_title">Hybrid SSD/Hard Disk Drives: This Time For Sure!</a></li><li><a href="http://blog.fosketts.net/2007/07/19/hybrid-drives-are-here-%e2%80%93-but-they%e2%80%99re-irrelevant-to-enterprise-storage/"  rel="bookmark" class="crp_title">Hybrid Drives Are Here – But they’re Irrelevant to Enterprise Storage</a></li><li><a href="http://blog.fosketts.net/2008/10/15/ssd-storage-where/"  rel="bookmark" class="crp_title">SSD: So Close and Yet So Far</a></li><li><a href="http://blog.fosketts.net/2007/08/02/wherefore-art-thou-solid-state-disks/"  rel="bookmark" class="crp_title">Wherefore Art Thou, Solid State Disks?</a></li></ul></div><script src="http://feeds.feedburner.com/~s/sfoskett?i=http://blog.fosketts.net/2008/10/22/flash-disk-cache/" type="text/javascript" charset="utf-8"></script><hr />
<p><small>© sfoskett for <a href="http://blog.fosketts.net">Stephen Foskett, Pack Rat</a>, 2008. |
<a href="http://blog.fosketts.net/2008/10/22/flash-disk-cache/">Is Flash A Disk Or A Cache?</a>
<br/>
This post was categorized as <a href="http://blog.fosketts.net/category/everything/enterprisestorage/" title="View all posts in Enterprise storage" rel="category tag">Enterprise storage</a>, <a href="http://blog.fosketts.net/category/everything/virtualstorage/" title="View all posts in Virtual Storage" rel="category tag">Virtual Storage</a>. Each of my categories has its own feed if you'd like to filter out or focus on posts like this.<br/>
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