An approximate analysis of the LRU and FIFO buffer replacement schemes
SIGMETRICS '90 Proceedings of the 1990 ACM SIGMETRICS conference on Measurement and modeling of computer systems
Analysis of the generalized clock buffer replacement scheme for database transaction processing
SIGMETRICS '92/PERFORMANCE '92 Proceedings of the 1992 ACM SIGMETRICS joint international conference on Measurement and modeling of computer systems
Understanding user behavior in large-scale video-on-demand systems
Proceedings of the 1st ACM SIGOPS/EuroSys European Conference on Computer Systems 2006
A flash-memory based file system
TCON'95 Proceedings of the USENIX 1995 Technical Conference Proceedings
Communications of the ACM - Web science
A case for flash memory ssd in enterprise database applications
Proceedings of the 2008 ACM SIGMOD international conference on Management of data
A reconfigurable FTL (flash translation layer) architecture for NAND flash-based applications
ACM Transactions on Embedded Computing Systems (TECS)
Improving NAND Flash Based Disk Caches
ISCA '08 Proceedings of the 35th Annual International Symposium on Computer Architecture
Design tradeoffs for SSD performance
ATC'08 USENIX 2008 Annual Technical Conference on Annual Technical Conference
Technical perspective: Integrating flash devices
Communications of the ACM - A Direct Path to Dependable Software
Migrating server storage to SSDs: analysis of tradeoffs
Proceedings of the 4th ACM European conference on Computer systems
Proceedings of the eleventh international joint conference on Measurement and modeling of computer systems
Advances in flash memory SSD technology for enterprise database applications
Proceedings of the 2009 ACM SIGMOD International Conference on Management of data
Proceedings of the 22nd international workshop on Network and Operating System Support for Digital Audio and Video
| Hi-index | 0.00 |
There is no doubt that video-on-demand (VoD) services are very popular these days. However, disk storage is a serious bottleneck limiting the scalability of a VoD server. Disk throughput degrades dramatically due to seek time overhead when the server is called upon to serve a large number of simultaneous video streams. To address the performance problem of disk, buffer cache algorithms that utilize RAM have been proposed. Interval caching is a state-of-the-art caching algorithm for a VoD server. Flash Memory Solid-State Drive (SSD) is a relatively new storage technology. Its excellent random read performance, low power consumption, and sharply dropping cost per gigabyte are opening new opportunities to efficiently use the device for enterprise systems. On the other hand, it has deficiencies such as poor small random write performance and limited number of erase operations. In this paper, we analyze tradeoffs and potential impact that flash memory SSD can have for a VoD server. Performance of various commercially available flash memory SSD models is studied. We find that low-end flash memory SSD provides better performance than the high-end one while costing less than the high-end one when the I/O request size is large, which is typical for a VoD server. Because of the wear problem and asymmetric read/write performance of flash memory SSD, we claim that interval caching cannot be used with it. Instead, we propose using file-level Least Frequently Used (LFU) due to the highly skewed video access pattern of the VoD workload. We compare the performance of interval caching with RAM and file-level LFU with flash memory by simulation experiments. In addition, from the cost-effectiveness analysis of three different storage configurations, we find that flash memory with hard disk drive is the most cost-effective solution compared to DRAM with hard disk drive or hard disk drive only.