PORCE: An efficient power off recovery scheme for flash memory

Chung, Tae-Sun; Lee, Myungho; Ryu, Yeonseung; Lee, Kangsun

doi:10.1016/j.sysarc.2008.03.007

Cited by 31 publications

(24 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Existing work on recovery from power failure aims to restore or repair flash file systems using logs and other techniques [16,4,12,10] or page-level atomic writes [7,2]. Numonyx [11] also provides guidelines to repeat interrupted operations after power failure.…”

Section: Related Workmentioning

confidence: 99%

Understanding the impact of power loss on flash memory

Tseng

Grupp

Swanson

2011

Proceedings of the 48th Design Automation Conference

View full text Add to dashboard Cite

Flash memory is quickly becoming a common component in computer systems ranging from music players to mission-critical server systems. As flash plays a more important role, data integrity in flash memories becomes a critical question. This paper examines one aspect of that data integrity by measuring the types of errors that occur when power fails during a flash memory operation. Our findings demonstrate that power failure can lead to several nonintuitive behaviors. We find that increasing the time before power failure does not always reduce error rates and that a power failure during a program operation can corrupt data that a previous, successful program operation wrote to the device. Our data also show that interrupted program operations leave data more susceptible to read disturb and increase the probability that the programmed data will decay over time. Finally, we show that incomplete erase operations make future program operations to the same block unreliable.

show abstract

Section: Related Workmentioning

confidence: 99%

Understanding the impact of power loss on flash memory

Tseng

Grupp

Swanson

2011

Proceedings of the 48th Design Automation Conference

View full text Add to dashboard Cite

show abstract

“…In the decoupled FTL, filesystem layer cannot access the FTL internal data structure like the page mapping table. On the other hand, except for some paper like LTFTL [6] and PORCE [3], the FTL-specific recovery mechanism has not been researched for the SSD's decoupled FTL.…”

Section: Crash Recovery In Ftlsmentioning

confidence: 99%

“…PORCE [3] only focused on the recovery scheme after the power-failure. PORCE divided the power-failure problem into two situations; the normal write operation consistency and the reclaiming operation consistency.…”

Section: Crash Recovery In Ftlsmentioning

confidence: 99%

Crash Recovery in FAST FTL

Moon

Lim

Park

et al. 2010

Software Technologies for Embedded and Ubiquitous Systems

View full text Add to dashboard Cite

Abstract. NAND flash memory is one of the non-volatile memories and has been replacing hard disk in various storage markets from mobile devices, PC/Laptop computers, even to enterprise servers. However, flash memory does not allow in-place-update, and thus a block should be erased before overwriting the existing data in it. In order to overcome the performance problem from this intrinsic deficiency, flash storage devices are equipped with the software module, called FTL (Flash Translation Layer). Meanwhile, flash storage devices are subject to failure and thus should be able to recover metadata (including address mapping information) as well as data from the crash. In general, the FTL layer is responsible for the crash recovery. In this paper, we propose a novel crash recovery scheme for FAST, a hybrid address mapping FTL. It writes periodically newly generated address mapping information in a log structured way, but it exploits the characteristics of FAST FTL that the log blocks in a log area are used in a round-robin way, thus providing two advantages over the existing FTL recovery schemes. One is the low overhead in performing logging during normal operations in FTL. The other is the fast recovery time.

show abstract

“…Even though the FRA uses the dual page mapping table for the log block, it uses the log block based power-off recovery scheme proposed in PORCE [15]. However, it should identify the PPN and PG-PPN while constructing the log block mapping table.…”

Section: Power-off Recoverymentioning

confidence: 99%

An efficient management scheme for updating redundant information in flash-based storage system

Lee

Jung

Choi

et al. 2010

Des Autom Embed Syst

View full text Add to dashboard Cite

Since flash memory has many attractive characteristics such as high performance, non-volatility, low power consumption and shock resistance, it has been widely used as a storage media in embedded and computer system environments. However, there are many shortcomings in flash memory such as potentially high I/O latency due to erase-before-write and poor durability due to limited erase cycles. To address these performance and reliability anomalies, many large-scale storage systems use redundancy-based parallel access schemes such as RAID techniques. However, such redundancy-based schemes incur high overhead due to generating and storing redundancy information, especially in flash-based storage systems. In this paper, we propose a novel and performance-effective approach using a redundancy-based data management scheme in flash storage, called Flash-aware Redundancy Array. The proposed technique not only reduces the redundancy management overhead by performing redundancy update operations during idle periods, but also provides a preventive mechanism to recover data from unexpected read errors occurring before such redundancy update operations finish. From the experiments, we found that the proposed technique improves flash-based storage systems by 19% in average execution time as compared to other redundancy-based approaches.

show abstract

PORCE: An efficient power off recovery scheme for flash memory

Cited by 31 publications

References 4 publications

Understanding the impact of power loss on flash memory

Understanding the impact of power loss on flash memory

Crash Recovery in FAST FTL

An efficient management scheme for updating redundant information in flash-based storage system

Contact Info

Product

Resources

About