Wednesday, July 23, 2014
Search
  
Submit your own News for
inclusion in our Site.
Click here...
Breaking News
European Regulators May Need Extra Concessions From Google
Apple Granted Patent for Smartwatch
New Intel Solid-State Drive Pro 2500 Series Packs SK Hynix Flash And Brings Trusted Security Features
Alliance Storage Technologies Releases Enterprise Class Cloud-Integrated Storage Solution
NVIDIA Launches Shield Tablet For Gamers
AOC u3477Pqu 34-Inch WQHD Monitor Announced
ADATA Launches XPG V3 DDR3 Memory For Overclockers
Licensing Fees Drive ARM's Profit
Active Discussions
help questions structure DVDR
Made video, won't play back easily
Questions durability monitor LCD
Questions fungus CD/DVD Media, Some expert engineer in optical media can help me?
CD, DVD and Blu-ray burning for Android in development
IBM supercharges Power servers with graphics chips
Werner Vogels: four cloud computing trends for 2014
Video editing software.
 Home > News > PC Parts > Hitachi...
Last 7 Days News : SU MO TU WE TH FR SA All News

Friday, November 29, 2013
Hitachi Combines SSD Tier And SSD Cache Methods in Tiered Storage Systems


Hitachi has evaluated the methods currently followed to utilize SSD on the storage having both SSDs and HDDs, and proposed a new one that increases the storage I/O performance.

The amount of access workload to information systems has been increasing. In general, input and output (I/O) activities have a locality, and the number of I/Os for each area is different. Typically, frequently accessed areas are stored on high performance but still expensive SSDs (Solid State Drives), and rarely accessed areas are stored on low performance and more affordable HDDs (Hard Disk Drives). The result is a increased I/O performance and a reduced system cost.

There are two methods to utilize SSD on the storage having both SSD and HDD.

- SSD Tier Method: Method Dividing data and locating the data to SSD or HDD

- SSD Cache Method: Method locating all data to HDD and coping partial data to SSD

The SSD tier method improves I/O performance by allocating hot areas to the SSD. However, it takes 1 hour to 24 hours to improve the I/O performance because this method optimizes data location every 1 hour to 24 hours when the hot areas move. Since the SSD cache method caches accessed area to SSD immediately, it improves the second and subsequence accesses to the area. Performance does not improve when cached data is frequently purged form SSD cache before data is accessed.

During the Second Asian Conference on Information Systems (ACIS 2013) held earlier this month in Phuket, Thailand, Yokohama Research Laboratory (YRL), Hitachi Ltd. presented a paper titled "Evaluation of SSD Tier Method and SSD Cache Method in Tiered Storage System."

Hitachi's researchers considered that by utilizing both methods simultaneously addresses the problems mentioned above. Assuming that the appropriate number of SSDs for tier and appropriate number of SSDs for cache may differ on the basis of the number of I/O, read-write ratio, and I/O locality, the researchers evaluated the effects of these methods by I/O simulation and clarified the conditions under these methods are effective.



The simulation result showed that the SSD tier method improves the storage I/O performance in write-intensive and low I/O locality workload with small SSD capacity. The SSD cache method is effective in read-intensive and high I/O locality workload with large SSD capacity. Hitachi claims that utilizing both methods simultaneously with write-intensive workload is the most effective.

"The storage I/O response time is reduced by up to 28% utilizing both methods simultaneously compared to using the SSD tier method or the SSD cache method separately," the researchers said.




Previous
Next
Microsoft, Yahoo Take Measures Against Hackers        All News        Apple's Black Friday Discounts Exclude iPhone And The Retina Mini
NAND Flash Is Shrinked And Gradually Replaces DRAM     PC Parts News      Scythe Kotetsu Compact CPU Cooler Released

Get RSS feed Easy Print E-Mail this Message

Related News
New Intel Solid-State Drive Pro 2500 Series Packs SK Hynix Flash And Brings Trusted Security Features
Kingston V310 SSD 960GB Released
Freecom Launches New External SSDs
Marvell and Taiwanese Makers To Benefit From Recent SSD Controller IC Industry Restructure
New Samsung 850 PRO SSD Is Powered by 3D V-NAND
Transcend Launches 1TB SATA and Portable Solid State Drives
Kingston and PNY Cought "Cheating" On SSD Components
OCZ Vector 180 SSD Appears At Computex
New Samsung 845DC EVO Solid State Drive Coming Next Month
ADATA Relases SP910 and SP900 SSDs
OWC Debuts New Aura SSDs for Apple MacBook Air and MacBook Pro
Plextor M6 Pro SSD with PlexTurbo Technology Coming At Computex

Most Popular News
 
Home | News | All News | Reviews | Articles | Guides | Download | Expert Area | Forum | Site Info
Site best viewed at 1024x768+ - CDRINFO.COM 1998-2014 - All rights reserved -
Privacy policy - Contact Us .