HOTSTORAGE

File systems have many configuration parameters. Such flexibility comes at the price of additional complexity which could lead to subtle configuration-related issues. To address the challenge, we study the potential configuration dependencies of a ...

Disk encryption today uses standard encryption methods that are length preserving and do not require storing any additional information with an encrypted disk sector. This significantly simplifies disk encryption management as the disk mapping does not ...

Existing cloud computing (or serverless) architectures provide convenient abstractions for application developers, but exhibit high latencies and do not support strong consistency guarantees. These limitations stem not only from the overheads due to ...

The need to support new features in existing storage systems is an ongoing concern for storage developers. So is the desire to develop next generation storage systems that can adopt newly developed feature improvements with relative ease. Extending ...

While gaining popularity in mobile devices, F2FS, a flash-friendly variation of log-structured file system, reveals three drawbacks: segment cleaning overhead, metadata update overhead, and file fragmentation, which becomes conspicuous under random ...

Building persistent memory (PM) data structures is difficult because crashes interrupt operations, leaving data structures in an inconsistent state. Solving this requires augmenting code that modifies PM state to ensure that interrupted operations can ...

Compute express link (CXL) is the first open multi-protocol method to support cache coherent interconnect for different processors, accelerators, and memory device types. Even though CXL manages data coherency mainly between CPU memory spaces and memory ...

We present IOTAP, a tool that analyzes and profiles block I/O traces. IOTAP computes the (dis)similarities among a set of workloads and sets a guideline for selecting a subset of traces for benchmarking. By doing so, we avoid experimentally running all ...

Polling is commonly indicated to be a more suitable IO completion mechanism than interrupt for ultra-low latency storage devices. However, polling's impact on overall energy efficiency has not been thoroughly investigated. In this paper, contrary to ...

We present FF-SSD, a machine learning-based SSD aging framework that generates representative future wear-out states. FF-SSD is accurate (up to 99% similarity), efficient (accelerates simulation time by 2×), and modular (can be integrated with existing ...

We argue that wear leveling in SSDs does more harm than good under modern settings where the endurance limit is in the hundreds. To support this claim, we evaluate existing wear leveling techniques and show that they exhibit anomalous behaviors and ...

This paper discusses the main benefits of ZNS and shows why ZNS can be deprived of internal parallelism when downsizing its zone writable capacity. To this end, we use two production ZNS SSDs and quantitively analyze the performance degradation caused ...

For the past few years, the enterprise Solid State Drives that employ NVM Express are widely used due to their high performance. It is common for multiple tenants and processes to share a single SSD. Providing fair SSD performance for multiple ...

Unlike traditional block-based SSDs, Zoned Namespace (ZNS) SSDs expose storage through the zoned block interface, completely eliminating the need for in-device garbage collection (GC) and relinquishing this responsibility to applications. As a result, ...

The Log-Structured Merge (LSM) tree is considered well-suited to zoned namespace (ZNS) storage devices since the write requests to LSM-tree is sequential. However, zones can be partially invalidated and be fragmented during LSM-tree compaction. The ...

To minimize unnecessary data movements from storage to a host, processing-in-storage (PiS) techniques, which move a compute unit to storage, have been proposed. In this position paper, we propose an extreme version of PiS solutions, called a processing-...

We propose a novel whitelist-based anti-ransomware solution called alohomora. Alohomora is based on our observation that an I/O activity of an application can be an effective abstraction level for managing I/O whitelisting. In alohomora, when a write ...

RAID has been widely adopted to enhance the performance, capacity, and reliability of the existing storage systems. However, we observe that the Linux software RAID (mdraid) suffers from its poor implementation of the lock mechanism. To address this, we ...

File fragmentation has been widely studied for several decades due to its detrimental effects on I/O activities. However, most of the previous research focuses on its performance aspect in a single application. In this paper, we analyze the effect of ...