Remap-Based Inter-Partition Copy for Arrayed Solid-State Drives

Han, Kyuhwa; Shin, Dongkun

doi:10.1109/tc.2021.3099694

Cited by 4 publications

(2 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Depending on workload intensity, it may not be possible to sufficiently migrate a read-dominant page stored in a write channel through GC-aware migration. The migration overhead is hidden by transferring the page using an approach similar to the GC-piggybacked migration proposed by Han et al [23], in which the read-dominant page in the victim block is migrated to a block in a read channel and GC is being performed in the write channel. Consequently, the page migration overhead is concealed by piggybacking the migration on the GC and eliminating unnecessary program operations.…”

Section: Leveraged Gc Migrationmentioning

confidence: 99%

Parallelism-Aware Channel Partition for Read/Write Interference Mitigation in Solid-State Drives

2022

Self Cite

View full text Add to dashboard Cite

The advancement of multi-level cell technology that enables storing multiple bits in a single NAND flash memory cell has increased the density and affordability of solid-state drives (SSDs). However, increased latency asymmetry between read and write (R/W) intensifies the severity of R/W interference, so reads cannot be processed for a long time owing to the extended flash memory resource occupancy of writing. Existing flash translation layer (FTL)-level mitigation techniques can allocate flash memory resources in a balanced manner taking R/W interference into account; however, due to the inefficient utilization of parallel flash memory resources, the effect on performance enhancement is restrictive. From the perspectives of the predicted access pattern and available concurrency of flash memory resources, we propose a parallelism-aware channel partition (PACP) scheme that prevents SSD performance degradation caused by R/W interference. Moreover, an additional performance improvement is achieved by reallocating interference-vulnerable page using leveraged garbage collection (GC) migration. The evaluation results showed that compared with the existing solution, PACP reduced the average read latency by 11.6% and average write latency by 6.0%, with a negligible storage overhead.

show abstract

Section: Leveraged Gc Migrationmentioning

confidence: 99%

Parallelism-Aware Channel Partition for Read/Write Interference Mitigation in Solid-State Drives

2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…Since the implementation of remap is file system-specific, the remap-based checkpoint is an optional feature, and KWAL can still work without the support of remap. The concept of remap was first introduced by several transaction-supporting SSDs [13], [17], [19]- [24]. Those use a device-level remap technique implemented within SSD devices.…”

Section: Introductionmentioning

confidence: 99%

Stackable Transactional File System Using Kernel-Level WAL

Park

Shin

2022

IEEE Access

View full text Add to dashboard Cite

User applications that require transactional file access generally use user-level transactional protocols such as logging, atomic rename, since the POSIX interface does not support transactional file operations. The user-level protocols are complex and require specific persistence properties of file systems for correctness. If the kernel provides transactional access to file data, application developers can avoid the complex and error-prone application-level protocols. Many previous studies on kernel-level transactional support have several critical limitations such as complex APIs, file system-dependence, and low transaction concurrency. In this paper, we propose a kernel-level write-ahead logging (WAL) technique, called KWAL. KWAL maintains user-transparent WAL files and redirects transactional IOs to them. Since KWAL is implemented as a stackable file system, it can be mounted over any native file systems, without modifying them. To provide a higher transaction concurrency while guaranteeing isolation, KWAL supports byte-level write conflict detection and repeatable read isolation. We also utilize a block remap technique to resolve the duplicate write problem of WAL-based transaction scheme. To demonstrate the usefulness of KWAL, we implemented a simple key-value store using KWAL APIs, fixed the wrong transaction implementation of the Git application, and simplified the implementation of the storage engines of MySQL and SQLite.

show abstract

Research and Design of Nand Flash Array From Host to Flash Translation Layer

Ding

Liu

et al. 2023

IEEE Access

View full text Add to dashboard Cite

Remap-Based Inter-Partition Copy for Arrayed Solid-State Drives

Cited by 4 publications

References 10 publications

Parallelism-Aware Channel Partition for Read/Write Interference Mitigation in Solid-State Drives

Parallelism-Aware Channel Partition for Read/Write Interference Mitigation in Solid-State Drives

Stackable Transactional File System Using Kernel-Level WAL

Research and Design of Nand Flash Array From Host to Flash Translation Layer

Contact Info

Product

Resources

About