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CompulsiveFS: Making NVRAM Suitable for Extremely Reliable Storage Byte-addressable, non-volatile memory (NVRAM)

by unknown authors
"... technologies such as magnetoresistive random access memory and phase-change memory have recently emerged as viable competitors to Flash RAM. These new technologies have the ability to improve the performance, reliability and power consumption of current storage systems. NVRAM generally operates—in d ..."
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of NVRAM-resident data in the face of software errors, hardware failures and system crashes. Currently, page protection is used to protect a write cache from software errors in the event of a system

PRIMS: Making NVRAM Suitable for Extremely Reliable Storage † Abstract

by Kevin M. Greenan
"... Non-volatile byte addressable memories are becoming more common, and are increasingly used for critical data that must not be lost. However, existing NVRAM-based file systems do not include features that guard against file system corruption or NVRAM corruption. Furthermore, most file systems check c ..."
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metadata, making it possible to periodically verify the correctness of file system operations while achieving throughput rates of an order of magnitude higher than page-protection during small writes. It also checks integrity on every operation and performs on-line scans of the entire NVRAM to ensure

Memoir: Practical State Continuity for Protected Modules

by Bryan Parno, Jacob R. Lorch, John R. Douceur, James Mickens, Jonathan M. Mccune
"... Abstract—To protect computation, a security architecture must safeguard not only the software that performs it but also the state on which the software operates. This requires more than just preserving state confidentiality and integrity, since, e.g., software may err if its state is rolled back to ..."
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to ensure rollback resistance without making the system vulnerable to system crashes. It does this by using a deterministic module, storing a concise summary of the module’s request history in protected NVRAM, and allowing only safe request replays after crashes. Since frequent NVRAM writes are impractical

2011 IEEE Symposium on Security and Privacy Memoir: Practical State Continuity for Protected Modules

by Bryan Parno, Jacob R. Lorch, John R. Douceur, James Mickens, Jonathan M. Mccune
"... Abstract—To protect computation, a security architecture must safeguard not only the software that performs it but also the state on which the software operates. This requires more than just preserving state confidentiality and integrity, since, e.g., software may err if its state is rolled back to ..."
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to ensure rollback resistance without making the system vulnerable to system crashes. It does this by using a deterministic module, storing a concise summary of the module’s request history in protected NVRAM, and allowing only safe request replays after crashes. Since frequent NVRAM writes are impractical

Protecting against rare event failures in archival systems

by Avani Wildani, Thomas Schwarz, Ethan Miller, Darrell Long, Avani Wildani, Thomas J. E. Schwarz, Darrell D. E. Long, Ethan L. Miller - Proc. 17 th IEEE International Symposium on Modeling, Analysis, and Simulation of Computer and Telecommunication Systems (MASCOTS '09 , 2009
"... Digital archives are growing rapidly, necessitating stronger reliability measures than RAID to avoid data loss from device failure. Mirroring, a popular solution, is too expensive over time. We present a compromise solution that uses multi-level redundancy coding to reduce the probability of data lo ..."
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are used to construct reliability stripes. To protect against rare event failures, reliability stripes are grouped into larger “über-groups, ” each of which has a corresponding “über-parity; ” über-parity is only used to recover data when disk failures overwhelm the redundancy in a single reliability

Protecting Against Rare Event Failures in Archival Systems

by unknown authors
"... Abstract—Digital archives are growing rapidly, necessitating stronger reliability measures than RAID to avoid data loss from device failure. Mirroring, a popular solution, is too expensive over time. We present a compromise solution that uses multi-level redundancy coding to reduce the probability o ..."
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which are used to construct reliability stripes. To protect against rare event failures, reliability stripes are grouped into larger super-groups, each of which has a corresponding super-parity; super-parity is only used to recover data when disk failures overwhelm the redundancy in a single reliability

NV-Hypervisor: Hypervisor-based Persistence for Virtual Machines

by Vasily A. Sartakov, Tu Braunschweig, Rüdiger Kapitza, Tu Braunschweig
"... Abstract—Power outages and subsequent recovery are major causes of service downtimes. This issue is amplified by the ongoing trend of steadily growing in-memory state of Internetbased services which increases the risk of data loss and extends recovery time. Protective measures against power outages, ..."
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-the-shelf software is not ready for benefiting from NVRAM. We present NV-Hypervisor a lightweight hypervisor extension that transparently provides persistence for virtual machines. NV-Hypervisor paves the way for utilizing NVRAM in virtualized environments (i.e., infrastructure-as-a-service clouds) and protects

Reliability mechanisms for file systems using non-volatile memory as a metadata store

by Kevin M. Greenan, Ethan L. Miller - In Proceedings of ACM/IEEE EMSOFT ’06 , 2006
"... Portable systems such as cell phones and portable media players commonly use non-volatile RAM (NVRAM) to hold all of their data and metadata, and larger systems can store metadata in NVRAM to increase file system performance by reducing synchronization and transfer overhead between disk and memory d ..."
Abstract - Cited by 6 (3 self) - Add to MetaCart
experiments show that the protection mechanisms can increase fault tolerance by six orders of magnitude while incurring an acceptable amount of overhead on writes to NVRAM. Since NVRAM is much faster and consumes far less power than disk-based storage, the added overhead of error checking leaves an NVRAM

A New Hierarchical Disk Architecture

by Yiming Hu, Qing Yang - IEEE Micro , 1998
"... Large RAM caches are generally used to speed up disk accesses. Such caches more effectively improve read performance than write performance, since write requests must be frequently written into disks to protect them from data loss or damage due to system failures. While Non-volatile RAM (NVRAM) cach ..."
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Large RAM caches are generally used to speed up disk accesses. Such caches more effectively improve read performance than write performance, since write requests must be frequently written into disks to protect them from data loss or damage due to system failures. While Non-volatile RAM (NVRAM

Hewlett-Packard Labs Intelligent Infrastructure Lab.

by Doe Hyun Yoon, Parthasarathy Ranganathan, Naveen Muralimanohar, Jichuan Chang, Mattan Erez
"... Emerging non-volatile memories such as phasechange RAM (PCRAM) offer significant advantages but suffer from write endurance problems. However, prior solutions are oblivious to soft errors (recently raised as a potential issue even for PCRAM) and are incompatible with high-level fault tolerance techn ..."
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requiring large dedicated storage. We discuss how FREE-p protects against both hard and soft errors and can be extended to chipkill. Further, FREE-p can be implemented purely in the memory controller, avoiding custom NVRAM devices. In addition to these benefits, FREE-p increases NVRAM lifetime by up to 26
Results 1 - 10 of 12