News
11/7/2008
08:52 AM
George Crump
George Crump
Commentary
Connect Directly
RSS
E-Mail
50%
50%

SSD's Latency Impact

In our last entry we talked about latency and what it was. We also discussed how storage system manufacturers are trying to overcome latency and performance issues of mechanical drives by using techniques like making the drives faster by using higher RPM drives, array groups with a high drive count, short-stroking those drives, wide striping those drives, and increasing the number of application servers

In our last entry we talked about latency and what it was. We also discussed how storage system manufacturers are trying to overcome latency and performance issues of mechanical drives by using techniques like making the drives faster by using higher RPM drives, array groups with a high drive count, short-stroking those drives, wide striping those drives, and increasing the number of application servers for improved parallelism.All of these techniques cost money, are not very green, and in many cases are more expensive than simply using SSD. Not to mention that they don't typically come close to SSD performance. The result has been the existence of standalone, purpose-built SSD solutions like those from Texas Memory Systems, Solid Data Systems, and Violin Memory, or the manufacturer adding SSD in a "drive-like" manner to its current storage systems.

The speed of SSD technology, especially DRAM, changes the latency focus away from the actual storage medium, as it has now been optimized, and onto the storage system's infrastructure, which is suddenly a lot slower than the storage media. For vendors that incorporate SSD into existing drive enclosures, the performance of the shelf itself becomes a problem, the performance of the processors in the controllers becomes a problem, and an incorrectly sized cache (too big or too small) becomes a problem.

Another factor is that the software load on the controller becomes an issue. For the past several years, storage manufacturers have been piling on features to the storage controller like snapshots, replication, data deduplication, and others. All of these features take computing resources away from responding to storage I/O requests, which worsens system latency.

The result is that while the SSD technology going into the solution may be fast, simply adding SSD to your storage system may not dramatically improve performance like it should. Standalone, purpose-built SSD systems offer lower latency because these vendors have built systems from the chip up that are designed to deliver on the low latency of SSD.

In our next entry, we will examine those differences and how storage manufacturers will need to alter their delivery of SSD technology. Then we will wrap up with capacity management on SSDs. At the cost of SSD technology, the only good SSD is a FULL SSD.

Join us for our upcoming Webcast SSD: Flash vs. DRAM...and the winner is?

Track us on Twitter: http://twitter.com/storageswiss.

Subscribe to our RSS feed.

George Crump is founder of Storage Switzerland, an analyst firm focused on the virtualization and storage marketplaces. It provides strategic consulting and analysis to storage users, suppliers, and integrators. An industry veteran of more than 25 years, Crump has held engineering and sales positions at various IT industry manufacturers and integrators. Prior to Storage Switzerland, he was CTO at one of the nation's largest integrators.

Comment  | 
Print  | 
More Insights
Register for Dark Reading Newsletters
Partner Perspectives
What's This?
In a digital world inundated with advanced security threats, Intel Security seeks to transform how we live and work to keep our information secure. Through hardware and software development, Intel Security delivers robust solutions that integrate security into every layer of every digital device. In combining the security expertise of McAfee with the innovation, performance, and trust of Intel, this vision becomes a reality.

As we rely on technology to enhance our everyday and business life, we must too consider the security of the intellectual property and confidential data that is housed on these devices. As we increase the number of devices we use, we increase the number of gateways and opportunity for security threats. Intel Security takes the “security connected” approach to ensure that every device is secure, and that all security solutions are seamlessly integrated.
Featured Writers
White Papers
Cartoon
Current Issue
Dark Reading's October Tech Digest
Fast data analysis can stymie attacks and strengthen enterprise security. Does your team have the data smarts?
Flash Poll
10 Recommendations for Outsourcing Security
10 Recommendations for Outsourcing Security
Enterprises today have a wide range of third-party options to help improve their defenses, including MSSPs, auditing and penetration testing, and DDoS protection. But are there situations in which a service provider might actually increase risk?
Video
Slideshows
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2013-7407
Published: 2014-10-22
Cross-site request forgery (CSRF) vulnerability in the MRBS module for Drupal allows remote attackers to hijack the authentication of unspecified victims via unknown vectors.

CVE-2014-3675
Published: 2014-10-22
Shim allows remote attackers to cause a denial of service (out-of-bounds read) via a crafted DHCPv6 packet.

CVE-2014-3676
Published: 2014-10-22
Heap-based buffer overflow in Shim allows remote attackers to execute arbitrary code via a crafted IPv6 address, related to the "tftp:// DHCPv6 boot option."

CVE-2014-3677
Published: 2014-10-22
Unspecified vulnerability in Shim might allow attackers to execute arbitrary code via a crafted MOK list, which triggers memory corruption.

CVE-2014-3828
Published: 2014-10-22
Multiple SQL injection vulnerabilities in Centreon 2.5.1 and Centreon Enterprise Server 2.2 allow remote attackers to execute arbitrary SQL commands via (1) the index_id parameter to views/graphs/common/makeXML_ListMetrics.php, (2) the sid parameter to views/graphs/GetXmlTree.php, (3) the session_id...

Best of the Web
Dark Reading Radio
Archived Dark Reading Radio
Follow Dark Reading editors into the field as they talk with noted experts from the security world.