Seung-Kook Cheong

Web Performance Enhancement of E-business System Using the SSD

In this paper, we proposed web performance enhancement of the e-business system using the SSD (Solid State Drive). In the e-business system, transactions must be strictly ordered, should occur at a fixed point time, and not be lost. We approached to solve e-business problem by using software and hardware techniques such as SSD. X-internet has advantage of C/S and Web applications. Since X-internet technique enables to reduce the loading time of web pages, X-internet is useful to enhance performance of the e-business system. SSD is a storage device that uses DRAM or NAND Flash as primary storage media. Since the SSD stores and accesses data directly to memory chips, which results in storage speeds far greater than conventional magnetic storage devices (HDD). Therefore x-internet techniques can be used to solve confused browsing and poor UI, and SSD can be used to solve I/O bottleneck of the e-business system.

Database processing performance and energy efficiency evaluation of DDR-SSD and HDD storage system based on the TPC-C

This paper is to analyze and evaluate the data processing performance and energy efficiency of DDR-SSD and HDD storage system based on the TPC-C. Our experiments show that DDR-SSD storage is 22 times better than HDD storage in performance and 138% energy reduction effect in case of tpmC only. Furthermore, DDR-SSD storage is almost 300 times better than HDD storage in performance in case of simultaneous TPC and file processing test. This implies that SSD storage system demonstrate the desired target performance even in the multiple different tasks, while HDD storage system shows the performance advantage only on the same task.

Research on the I/O Performance Advancement of a Low Speed HDD Using DDR-SSD

In this paper, we proposed Hot/Cold File Management Algorithm to maximize performance to environment combining a low speed I/O property HDD with a high speed I/O SSD. As a result to test by applying that algorithm, we confirm that performance get better multiples of 11.36(in case of block size=4k), multiples of 12.79(in case of block size=8k) and that performance is unrelated to a type of second disk (HDD, Flash-SSD, DRAM-SSD).

QoS packet-scheduling scheme for VoIP services in IEEE 802.16e systems

The IEEE 802.16 wireless metropolitan area network (WMAN) standard is designed to correct expensive communication costs in CDMA-based mobile communication systems and limited coverage problems in wireless LAN systems. Thus, the IEEE 802.16e standard can provide mobile high-speed packet access between mobile stations and the Internet service provider through the base station with cheap communication fees. To efficiently accommodate voice over IP (VoIP) services in IEEE 802.16 systems, an uplink quality of service packet-scheduling scheme is proposed, and its performance is evaluated with an NS-2 network simulator in this paper. Numerical results show that this proposed scheme can increase the system capacity by 100% more than in the unsolicited rand service (UGS) scheme and 30% more than the extended real-time polling service (ertPS) scheme, respectively.

The analysis of integration test result for ATM switching systems

This paper presents a new analysis method of integration test result for ATM switching systems. The new analysis method, called XTAM(eXchange system Test result Analysis Method), will provide numerical parameters from test results which are vague, qualitative and descriptive. The analysis method is based on Fuzzy theory. This method has been successfully applied to the ATM switching system which is under development by ETRI in Korea.

Load Performance Evaluation of the SSD According to the Number of Concurrent Users

In this paper, we designed DRAM-SSD and analyzed the load performance of DRAM-SSD and HDD according to the number of concurrent users. In experimental results, we showed that load performance of DRAM-SSD is about 20times more than that of the HDD. DRAM-SSD is useful for application which has many concurrent users such as first come first served system.

A Disk I/O Performance Specific Analysis for the Real/Write Ratio and Block-Size Variation

In this paper, we are analyzed the performance of HDD and DRAMSSD about Disk I/O block size and Read/Write rate in block device level. HDD has a characteristic that Data block size of maximum performance is different about Read/Write rate. Otherwise, SSD has a characteristic that Data block size has nothing to do with Read/Write rate. Accordingly, HDD must be defined with Block size depending on Read/Write rate to obtain maximum performance. but SSD has nothing to do with Read/Write rate.

Software RAID for Data Intensive Applications in Cloud Computing

In this paper, we propose a software RAID to support data intensive applications in cloud computing. The proposed software RAID is based on DDR-SSD to enhance the performance of existing RAID systems. Also, we take the characteristics of DDR-SSD into account to design our software RAID. RAID level 5 which is generally used in data intensive applications has small write problems. In RAID level 5, to process a small write request, we need to read its parity block stored in disk, read old block, perform XOR operation, and write updated block and parity block. In this paper, we propose a differential-logging method which carefully considers the DDR-SSD to solve the small write problem in RAID level 5. We show that our proposed method out performs the existing software RAID through simulations.

DDR-SSD and HDD storage system performance evaluation in unified storage system for cloud computing

This paper is to measure and analyze a performance - TPS(Transaction Per Second) and TET(Total Execution Time, that is, data I/O processing total time during test) - variation of DRAM-SSD and HDD storage in server-storage N:1 connection environment. We used to two test method - connection between single server and single storage(1:1), and between multiple server and single storage(N:1) - in the SAN environment. As a results, we confirmed that performance is decreased in N:1 than 1:1 connection. TET performance is decreased 50.9%, 9.5% in case of HDD, DRAM-SSD Storage respectively and TPS performance is decreased 28.2% in HDD Storage, 6.8% in DRAM-SSD Storage. Specially in the NΩ1 connection, we observed not only sharp performance fall but also unstable characteristic in HDD Storage system. In conclusion, we suggest that it must be used DRAM-SSD storage in N:1 connection operation environment between multiple server and a storage system for cloud computing.

Performance Analysis of DRAM-SSD and HDD According to the Each Environment on MYSQL

Recently, Users needed storage for processing high-capacity data. Meanwhile, the HDD was used primarily as storage device, but SSD was developed as a fast access device. So, the use of SSD increased a lot of capacity-process. Using a SAN Switch, we tested in order to resolve data process faster. So in this paper, DRAM-SSD and HDD’s performance ability in the data process will be confirmed using TPC-H Benchmark on MYSQL at SAN environment. From the performance analysis results, performance difference of HDD and DRAM-SSD is little when database size is low at san switch connecting with storage. But ad-hoc query process ability difference between DRAM-SSD and HDD increased. Based on these results in a SAN-based, DRAM-SSD has a better performance than the HDD. Therefore San is judged to be more effective when dealing with the large amounts of data using a SAN to manage data.