Flash memory as a hard drive replacement
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The document discusses replacing hard disk drives with flash memory. It covers the basics of flash memory and its advantages over HDDs, including lower power consumption and greater robustness. Methods for prolonging flash memory lifespan are explored, such as moving temporary files to RAM, managing swap space, migrating frequently written files, and tuning file systems to minimize writes.
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This document provides a summary of tips for hardening the default installation of Red Hat Enterprise Linux 5. It recommends securing physical access to servers, minimizing installed software, regularly updating systems, disabling unnecessary services, removing SUID/SGID permissions and X Windows, configuring firewalls and SELinux, and securing SSH access. The full document provides more detailed guidance for implementing these security configurations.
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This document summarizes key concepts from Chapter 11 of the textbook "Database System Concepts". It discusses various types of physical storage media like magnetic disks, flash memory, and tape storage. It describes the storage hierarchy from fastest but most volatile primary storage to slower but more durable tertiary storage. It also covers topics like disk subsystem organization, performance optimization techniques, RAID storage, and how redundancy and parallelism can improve reliability and performance.
os
Windows 2000 is a 32-bit operating system designed for compatibility, reliability, and performance. It includes several key components like the kernel, executive services, and environmental subsystems. The kernel schedules threads and handles exceptions/interrupts. Executive services include the object manager, virtual memory manager, process manager, and I/O manager. Environmental subsystems allow running applications from other operating systems. The document also discusses disk structure, file systems, networking, and other OS concepts.
Unit vos - File systems
The document discusses several topics related to operating system I/O subsystems:
- It describes kernel I/O services like buffering, caching, spooling, scheduling I/O requests, and handling errors.
- It explains disk scheduling algorithms like SSTF, SCAN, C-SCAN, and C-LOOK that aim to minimize disk head movement.
- It covers disk management topics such as disk formatting, initialization, and recovering bad blocks.
Ch14 OS
The document summarizes mass storage systems including disk structure, disk scheduling algorithms, disk management, RAID structure, and tertiary storage devices. It discusses how disks are logically addressed and mapped to physical sectors. It describes common disk scheduling algorithms like FCFS, SSTF, SCAN, and C-SCAN and factors in selecting an algorithm. It also outlines disk formatting, partitioning, bad block handling, and swap space management in operating systems.
OSCh14
The document discusses mass storage systems, including disk structure, disk scheduling algorithms, disk management, RAID structure, disk attachment methods, stable storage implementation, and tertiary storage devices. It provides details on disk formatting, swap space management, different RAID levels, network attached storage, stable storage implementation, removable media like tapes and optical disks, operating system issues, and hierarchical storage management.
OS_Ch14
The document discusses mass storage systems including disk structure, disk scheduling algorithms, disk management, RAID structure, disk attachment methods, stable storage implementation, and tertiary storage devices. It provides details on how disks are logically structured and mapped, common disk scheduling algorithms like FCFS, SSTF, SCAN, and C-SCAN, and how operating systems manage disks through partitioning and formatting. It also summarizes RAID levels, approaches to stable storage, and examples of tertiary storage devices like tapes, optical disks, and removable magnetic disks.
Preventing Possible PVS Performance Pain Points
Citrix Provisioning Services has been invigorated with new storage optimisations. Every storage vendor that got into business providing a solution to I/O problems may have to think twice about the value they add given new services within PVS. But, does that mean that creating a viable PVS service has become a breeze? In Preventing Possible PVS Performance Pain Points we set out to look at the performance of PVS server including networking, host configuration, the importance of being earnest about memory, the good, bad and ugly of RAM+HDD write cache and Windows Storage or hyper-converged environments, migration and availability.
I/O System and Case study
The document provides information about I/O systems and a case study, including details about disk structure, disk scheduling algorithms, disk management techniques, direct memory access, swap space management, RAID structure, disk attachment methods, and features of the Windows 2000 and MS-DOS operating systems. Key points covered include how disks are addressed as logical blocks, techniques for minimizing seek time and maximizing disk bandwidth, common disk scheduling algorithms like SSTF and SCAN, and how swap space is allocated and managed in different operating systems.
Tuning Linux for Databases.
This presentation discusses optimizing Linux systems for PostgreSQL databases. Linux is a good choice for databases due to its active development, features, stability, and community support. The presentation covers optimizing various system resources like CPU scheduling, memory, storage I/O, and power management to improve database performance. Specific topics include disabling transparent huge pages, tuning block I/O schedulers, and selecting appropriate scaling governors. The overall message is that Linux can be adapted for database workloads through testing and iterative changes.
Алексей Лесовский "Тюнинг Linux для баз данных. "
В любом проекте всегда есть данные которые важно не потерять. И если проект перешагнул размеры домашнего, то наверняка там уже используется что-то более надежное чем текстовые файлы на диске. Скорее всего это какая-то конкретная база данных. Учитывая важную роль баз данных к ним предъявляют жесткие требования производительности и стабильности. Отдельной особенностью является и операционная система на которой работает база данных. Опыт и практика подсказывает что это будет Linux - одна из наиболее популярных на сегодняшний день операционных систем. Прогрессивное развитие в сочетании с гибкостью и стабильностью делает Linux хорошим кандидатом в качестве платформы для баз данных (да и не только). Однако настройки по-умолчанию в большинстве дистрибутивов предназначены для широкого круга задач и потребностей. В этом докладе я расскажу о том, на какие настройки следует обратить внимание и как они влияют на работу СУБД. Как сделать работу СУБД более предсказуемой, как в простых условиях, так и в условиях непостоянной или растущей нагрузки.
Configuring Aerospike - Part 2
Configuring storage. The slides to this webinar cover how to configure storage for Aerospike. It includes a discussion of how Aerospike uses Flash/SSDs and how to get the best performance out of them.
Find the full webinar with audio here - http://www.aerospike.com/webinars
GuideIT Delivery Design - File Shares
This document defines the file sharing and failover cluster design for a customer. It was decided to use a centralized file cluster with Microsoft failover clustering to reduce support costs. Storage will be provisioned across multiple LUNs for different file types and services. A physical failover cluster will be used due to virtualization support limitations. LUN sizes are specified for various file types to support 500 users initially with room to scale.
Ph hw advisor
The document provides a hardware recommendation for a Process Historian system handling data from 1 PCS 7 OS system with 5000 tags and 1429 average tag values per second. It recommends a server with an Intel Xeon E5-2643v4 CPU, 64GB RAM, 6 HDDs for the system, transaction log, and data partitions, and the use of RAID and regular backups due to the choice of low data reliability. It also recommends a UPS, storing segment and database backups on NAS, and comparable virtualization hardware if virtualizing.
FreeBSD Portscamp, Kuala Lumpur 2016
This document provides an outline for a FreeBSD training course. It covers topics such as why to use FreeBSD and UNIX, installing FreeBSD 10.2, disk partitioning, the directory structure, basic commands, creating and managing user accounts, and configuring networking, filesystems, and services. The outline is divided into multiple sections with subsections covering specific commands, configuration files, and how to accomplish tasks like installing software and shutting down the system.
Storage Area Networks Unit 2 Notes
INTELLIGENT DISK SUBSYSTEMS – 2, I/O TECHNIQUES – 1
Caching: Acceleration of Hard Disk Access; Intelligent disk subsystems; Availability of disk subsystems. The Physical I/O path from the CPU to the Storage System; SCSI.
I/O TECHNIQUES – 2, NETWORK ATTACHED STORAGE
Fibre Channel Protocol Stack; Fibre Channel SAN; IP Storage. The NAS Architecture, The NAS hardware Architecture, The NAS Software Architecture, Network connectivity, NAS as a storage system.
Vmfs
Fetch policy determines when pages are brought into main memory, with demand paging bringing pages in only when referenced while prepaging brings in more pages, often pages not referenced. The TLB caches page table entries to map virtual to physical addresses, with TLB misses similarly slow as instruction/data cache misses. For page replacement when no free frames exist, a page replacement algorithm selects a victim frame to swap out and free the frame.
Trouble shoot with linux syslog
This document discusses Linux logging and log management utilities syslog, rsyslog, logrotate, and syslog-ng. It provides details on:
1) Configuring rsyslog to log different message types and severities to specific files via /etc/rsyslog.conf.
2) Using logrotate to compress and archive log files on a periodic basis according to rules in /etc/logrotate.conf and /etc/logrotate.d/.
3) Configuring remote logging with syslog or syslog-ng by sending messages from clients to a central server.
Redis persistence in practice
Practical advices how to achieve persistence in Redis. Detailed overview of all cons and pros of RDB snapshots and AOF logging. Tips and tricks for proper persistence configuration with Redis pools and master/slave replication.
A presentaion on Panasas HPC NAS
The document is a presentation about Panasas storage for Saudi Aramco. It begins with an agenda that covers understanding the Panasas storage technique, its technical details, common error traces, and problem solving. It then provides bullet points on starting the session, the terminology used, how Panasas works, and fault fixing methods. The presentation defines key Panasas components like blades, directors, volumes, and snapshots. It explains how data is stored across object storage devices and reconstructed in the event of failures. Methods for upgrading, generating core dumps, and analyzing logs are also overviewed.
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Red Hat Linux 5 Hardening Tips - National Security Agency
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HCL Notes and Domino License Cost Reduction in the World of DLAU
Webinar Recording: https://www.panagenda.com/webinars/hcl-notes-and-domino-license-cost-reduction-in-the-world-of-dlau/
The introduction of DLAU and the CCB & CCX licensing model caused quite a stir in the HCL community. As a Notes and Domino customer, you may have faced challenges with unexpected user counts and license costs. You probably have questions on how this new licensing approach works and how to benefit from it. Most importantly, you likely have budget constraints and want to save money where possible. Don’t worry, we can help with all of this!
We’ll show you how to fix common misconfigurations that cause higher-than-expected user counts, and how to identify accounts which you can deactivate to save money. There are also frequent patterns that can cause unnecessary cost, like using a person document instead of a mail-in for shared mailboxes. We’ll provide examples and solutions for those as well. And naturally we’ll explain the new licensing model.
Join HCL Ambassador Marc Thomas in this webinar with a special guest appearance from Franz Walder. It will give you the tools and know-how to stay on top of what is going on with Domino licensing. You will be able lower your cost through an optimized configuration and keep it low going forward.
These topics will be covered
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zkStudyClub - LatticeFold: A Lattice-based Folding Scheme and its Application...
Folding is a recent technique for building efficient recursive SNARKs. Several elegant folding protocols have been proposed, such as Nova, Supernova, Hypernova, Protostar, and others. However, all of them rely on an additively homomorphic commitment scheme based on discrete log, and are therefore not post-quantum secure. In this work we present LatticeFold, the first lattice-based folding protocol based on the Module SIS problem. This folding protocol naturally leads to an efficient recursive lattice-based SNARK and an efficient PCD scheme. LatticeFold supports folding low-degree relations, such as R1CS, as well as high-degree relations, such as CCS. The key challenge is to construct a secure folding protocol that works with the Ajtai commitment scheme. The difficulty, is ensuring that extracted witnesses are low norm through many rounds of folding. We present a novel technique using the sumcheck protocol to ensure that extracted witnesses are always low norm no matter how many rounds of folding are used. Our evaluation of the final proof system suggests that it is as performant as Hypernova, while providing post-quantum security.
Paper Link: https://eprint.iacr.org/2024/257
Introduction of Cybersecurity with OSS at Code Europe 2024
I develop the Ruby programming language, RubyGems, and Bundler, which are package managers for Ruby. Today, I will introduce how to enhance the security of your application using open-source software (OSS) examples from Ruby and RubyGems.
The first topic is CVE (Common Vulnerabilities and Exposures). I have published CVEs many times. But what exactly is a CVE? I'll provide a basic understanding of CVEs and explain how to detect and handle vulnerabilities in OSS.
Next, let's discuss package managers. Package managers play a critical role in the OSS ecosystem. I'll explain how to manage library dependencies in your application.
I'll share insights into how the Ruby and RubyGems core team works to keep our ecosystem safe. By the end of this talk, you'll have a better understanding of how to safeguard your code.
GNSS spoofing via SDR (Criptored Talks 2024)
In the realm of cybersecurity, offensive security practices act as a critical shield. By simulating real-world attacks in a controlled environment, these techniques expose vulnerabilities before malicious actors can exploit them. This proactive approach allows manufacturers to identify and fix weaknesses, significantly enhancing system security.
This presentation delves into the development of a system designed to mimic Galileo's Open Service signal using software-defined radio (SDR) technology. We'll begin with a foundational overview of both Global Navigation Satellite Systems (GNSS) and the intricacies of digital signal processing.
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JavaLand 2024: Application Development Green Masterplan
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Driving Business Innovation: Latest Generative AI Advancements & Success Story
Are you ready to revolutionize how you handle data? Join us for a webinar where we’ll bring you up to speed with the latest advancements in Generative AI technology and discover how leveraging FME with tools from giants like Google Gemini, Amazon, and Microsoft OpenAI can supercharge your workflow efficiency.
During the hour, we’ll take you through:
Guest Speaker Segment with Hannah Barrington: Dive into the world of dynamic real estate marketing with Hannah, the Marketing Manager at Workspace Group. Hear firsthand how their team generates engaging descriptions for thousands of office units by integrating diverse data sources—from PDF floorplans to web pages—using FME transformers, like OpenAIVisionConnector and AnthropicVisionConnector. This use case will show you how GenAI can streamline content creation for marketing across the board.
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We’ll wrap up with a live Q&A session where you can engage with our experts on your specific use cases, and learn more about optimizing your data workflows with AI.
This webinar is ideal for professionals seeking to harness the power of AI within their data management systems while ensuring high levels of customization and security. Whether you're a novice or an expert, gain actionable insights and strategies to elevate your data processes. Join us to see how FME and AI can revolutionize how you work with data!
Main news related to the CCS TSI 2023 (2023/1695)
An English 🇬🇧 translation of a presentation to the speech I gave about the main changes brought by CCS TSI 2023 at the biggest Czech conference on Communications and signalling systems on Railways, which was held in Clarion Hotel Olomouc from 7th to 9th November 2023 (konferenceszt.cz). Attended by around 500 participants and 200 on-line followers.
The original Czech 🇨🇿 version of the presentation can be found here: https://www.slideshare.net/slideshow/hlavni-novinky-souvisejici-s-ccs-tsi-2023-2023-1695/269688092 .
The videorecording (in Czech) from the presentation is available here: https://youtu.be/WzjJWm4IyPk?si=SImb06tuXGb30BEH .
Skybuffer AI: Advanced Conversational and Generative AI Solution on SAP Busin...
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With Skybuffer AI, various AI models can be integrated into a single communication channel such as Microsoft Teams. This integration empowers business users with insights drawn from SAP backend systems, enterprise documents, and the expansive knowledge of Generative AI. And the best part of it is that it is all managed through our intuitive no-code Action Server interface, requiring no extensive coding knowledge and making the advanced AI accessible to more users.
Building Production Ready Search Pipelines with Spark and Milvus
Spark is the widely used ETL tool for processing, indexing and ingesting data to serving stack for search. Milvus is the production-ready open-source vector database. In this talk we will show how to use Spark to process unstructured data to extract vector representations, and push the vectors to Milvus vector database for search serving.
Choosing The Best AWS Service For Your Website + API.pptx
Have you ever been confused by the myriad of choices offered by AWS for hosting a website or an API?
Lambda, Elastic Beanstalk, Lightsail, Amplify, S3 (and more!) can each host websites + APIs. But which one should we choose?
Which one is cheapest? Which one is fastest? Which one will scale to meet our needs?
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Generating privacy-protected synthetic data using Secludy and Milvus
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5th LF Energy Power Grid Model Meet-up Slides
5th Power Grid Model Meet-up
It is with great pleasure that we extend to you an invitation to the 5th Power Grid Model Meet-up, scheduled for 6th June 2024. This event will adopt a hybrid format, allowing participants to join us either through an online Mircosoft Teams session or in person at TU/e located at Den Dolech 2, Eindhoven, Netherlands. The meet-up will be hosted by Eindhoven University of Technology (TU/e), a research university specializing in engineering science & technology.
Power Grid Model
The global energy transition is placing new and unprecedented demands on Distribution System Operators (DSOs). Alongside upgrades to grid capacity, processes such as digitization, capacity optimization, and congestion management are becoming vital for delivering reliable services.
Power Grid Model is an open source project from Linux Foundation Energy and provides a calculation engine that is increasingly essential for DSOs. It offers a standards-based foundation enabling real-time power systems analysis, simulations of electrical power grids, and sophisticated what-if analysis. In addition, it enables in-depth studies and analysis of the electrical power grid’s behavior and performance. This comprehensive model incorporates essential factors such as power generation capacity, electrical losses, voltage levels, power flows, and system stability.
Power Grid Model is currently being applied in a wide variety of use cases, including grid planning, expansion, reliability, and congestion studies. It can also help in analyzing the impact of renewable energy integration, assessing the effects of disturbances or faults, and developing strategies for grid control and optimization.
What to expect
For the upcoming meetup we are organizing, we have an exciting lineup of activities planned:
-Insightful presentations covering two practical applications of the Power Grid Model.
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-An opportunity to connect with fellow Power Grid Model enthusiasts and users.
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Consult the full report at https://www.oecd.org/digital/oecd-artificial-intelligence-review-of-germany-609808d6-en.htm
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Flash memory as a hard drive replacement
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