TY - GEN
T1 - IDiscard
T2 - 2018 IEEE International Conference on Big Data and Smart Computing, BigComp 2018
AU - Kang, Dong Hyun
AU - Eom, Young Ik
N1 - Publisher Copyright:
© 2018 IEEE.
PY - 2018/5/25
Y1 - 2018/5/25
N2 - NAND flash storage devices have become one of the fundamental building blocks in cloud computing systems because they provide fast responsiveness and low-power consumption compared with HDDs. Unfortunately, flash storage devices still suffer from the semantic gap between the file system and the flash storage device. In this paper, we first answer a simple question: Is Discard() command still a research issue? We then propose an enhanced Discard() scheme, called iDiscard, to completely bridge the semantic gap between the current ext4 file system and flash storage devices. The key idea is that iDiscard dynamically invalidates flash pages mapped to the obviated inode blocks of the file system. For evaluation, we implemented iDiscard on the current ext4 file system and then compared it on the Disksim simulator and a real SSD, Samsung 850 PRO SSD. Our experimental results clearly show that iDiscard efficiently reduces the number of pages in the flash storage, that are valid but contain metadata for removed files, by up to 5.4x compared with existing ext4 file system.
AB - NAND flash storage devices have become one of the fundamental building blocks in cloud computing systems because they provide fast responsiveness and low-power consumption compared with HDDs. Unfortunately, flash storage devices still suffer from the semantic gap between the file system and the flash storage device. In this paper, we first answer a simple question: Is Discard() command still a research issue? We then propose an enhanced Discard() scheme, called iDiscard, to completely bridge the semantic gap between the current ext4 file system and flash storage devices. The key idea is that iDiscard dynamically invalidates flash pages mapped to the obviated inode blocks of the file system. For evaluation, we implemented iDiscard on the current ext4 file system and then compared it on the Disksim simulator and a real SSD, Samsung 850 PRO SSD. Our experimental results clearly show that iDiscard efficiently reduces the number of pages in the flash storage, that are valid but contain metadata for removed files, by up to 5.4x compared with existing ext4 file system.
KW - discard command
KW - Ext4 file system
KW - flash storage device
UR - https://www.scopus.com/pages/publications/85048504466
U2 - 10.1109/BigComp.2018.00060
DO - 10.1109/BigComp.2018.00060
M3 - Conference contribution
AN - SCOPUS:85048504466
T3 - Proceedings - 2018 IEEE International Conference on Big Data and Smart Computing, BigComp 2018
SP - 360
EP - 366
BT - Proceedings - 2018 IEEE International Conference on Big Data and Smart Computing, BigComp 2018
PB - Institute of Electrical and Electronics Engineers Inc.
Y2 - 15 January 2018 through 18 January 2018
ER -