Vmfs
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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.
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Assignment 2 Theoretical
1. A page table maps virtual addresses to physical addresses in memory, allowing processes to access virtual memory. A TLB cache improves translation speed.
2. Virtual memory allows more RAM to be accessed than is physically installed by paging pages between RAM and disk. Pagination and swapping impact performance.
3. RAID uses multiple disks for redundancy to increase reliability or performance. Common RAID levels include RAID 0 for striping and RAID 1 for mirroring.
4. FAT supports small directories faster than NTFS but performance degrades with fragmentation. NTFS resists fragmentation and supports larger files and directories.
CS 542 Putting it all together -- Storage Management
The document provides an overview and plan for a lecture on database management systems. Key points include:
- By the second break, the lecture will cover storage hierarchies, secondary storage management, and system catalogs.
- After the second break, the topics will include data modeling and storage hierarchies.
- Storage hierarchies involve multiple storage levels from main memory to disk and beyond. The cost and performance of each level differs.
- Techniques like caching aim to keep frequently used data in faster storage levels like memory.
virtual memory
Virtual memory is a memory management technique that allows programs to access memory addresses beyond their actual physical RAM size. It maps virtual addresses to physical addresses stored in RAM or on a hard disk using page tables and a translation process. When a program requests a page not in RAM, a page fault occurs and the OS moves a page from disk to RAM, suspending the program until the page is loaded. Page replacement algorithms like LRU then select pages to remove from RAM and write to disk when RAM is full to make space for new pages. This allows for larger memory sizes, more efficient memory usage, and multitasking.
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.
Memory management in Linux
The document discusses Linux memory management, describing how physical memory is divided into page frames and virtual memory allows processes to have a virtual view of memory mapped to physical memory using page tables, and covers topics like memory overcommit, page cache, swap space, and tools for monitoring memory usage.
Nachos 2
This document discusses various computer storage technologies including:
- FIFO and LRU caching algorithms.
- Hard disk drives including cylinders, tracks, sectors, and clusters. Latency is discussed in relation to rotational speed.
- Solid state drives and their advantages over hard disk drives like speed and lack of moving parts.
- SATA vs ATA interfaces and performance comparisons.
- RAID disk arrays and their use of redundancy to increase reliability.
- NTFS and FAT16 file systems. NTFS supports long filenames and compression while FAT16 has limitations like a 2GB size limit.
Nachos 2
Nachos 2
The document discusses various data storage technologies including FIFO, LRU, cache memory, hard disk drives, solid state drives, SATA vs ATA interfaces, and RAID disk arrays. It provides details on the characteristics and implementations of each technology, such as how FIFO and LRU ordering techniques work, the components and operation of hard disks, performance comparisons of SATA and ATA interfaces, and the use of redundancy in RAID arrays.
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.
Oracle Open World 2014: Lies, Damned Lies, and I/O Statistics [ CON3671]
The document discusses analyzing I/O performance and summarizing lessons learned. It describes common tools used to measure I/O like moats.sh, strace, and ioh.sh. It also summarizes the top 10 anomalies encountered like caching effects, shared drives, connection limits, I/O request consolidation and fragmentation over NFS, and tiered storage migration. Solutions provided focus on avoiding caching, isolating workloads, proper sizing of NFS parameters, and direct I/O.
Cs8493 unit 4
UNIT IV FILE SYSTEMS AND I/O SYSTEMS 9
Mass Storage system – Overview of Mass Storage Structure, Disk Structure, Disk Scheduling and Management, swap space management; File-System Interface – File concept, Access methods, Directory Structure, Directory organization, File system mounting, File Sharing and Protection; File System Implementation- File System Structure, Directory implementation, Allocation Methods, Free Space Management, Efficiency and Performance, Recovery; I/O Systems – I/O Hardware, Application I/O interface, Kernel I/O subsystem, Streams, Performance.
Introduction to Hard Disk Drive by Vishal Garg
The document provides an introduction to hard disk drives including their main components and how they work. It discusses the geometry of hard drives including heads, cylinders, and sectors per track. It describes the parts of a hard drive like platters, arms, and motors. It covers characteristics of hard drives like seek time and interfaces. It explains what a hard disk partition is and reasons for creating multiple partitions like using different file systems or operating systems.
제2회난공불락 오픈소스 세미나 커널튜닝
This document provides an overview of kernel tuning and customizing for performance on Enterprise Linux. It discusses monitoring tools, basic tuning steps like disabling unused services, memory tuning including hugepages and transparent huge pages, swap/cache tuning. It also covers I/O and filesystem tuning and networking tuning. The goal is to provide concepts and approaches for tuning the major components to optimize performance.
Chapter 3
Computer memory can be classified into different types. The main types include semiconductor memory, cache memory, magnetic disks, optical disks, and tape drives. Semiconductor memory includes volatile RAM and non-volatile ROM. Cache memory is high-speed memory placed between the CPU and main memory for faster access. Magnetic disks include hard disks used for permanent storage and floppy disks for removable storage. Optical disks include CDs, DVDs, and Blu-ray disks. Tape drives are used for backup storage. RAID (Redundant Array of Independent Disks) utilizes multiple disks for performance, capacity, and reliability.
Measuring Firebird Disk I/O
This document discusses two methods for measuring Firebird disk I/O: 1) Using the MON$IO_STATS tables within Firebird to track page reads, writes, fetches, and marks, and 2) Using the host operating system's performance monitoring tools like Windows Performance Monitor. It notes some limitations with MON$IO_STATS and provides examples of specific disk and process counters to log. The document also covers estimating required IOPS based on potential disk throughput and accounting for factors like RAID write penalties.
Технологии работы с дисковыми хранилищами и файловыми системами Windows Serve...
##Что такое Storage Replica
##Архитектура и сценарии
##Синхронная и асинхронная репликация
##Междисковая, межсерверная, внутрикластерная и межкластерная репликация
##Дизайн и проектирование Storage Replica
##Нововведения в Windows Server 2016 TP5
##Графический интерфейс управления, и другие возможности - демонстрация и планы развития
##Интеграция Storage Replica с Storage Spaces Direct
Mass storage systemsos
This document discusses mass storage systems and their management by operating systems. It covers disk structure, disk scheduling algorithms, disk management including partitioning and file systems, swap space management, RAID configurations, and implementing stable storage. The objectives are to describe mass storage devices, explain their performance characteristics, evaluate disk scheduling, and discuss operating system services for storage like RAID.
What is the average rotational latency of this disk drive What seek.docx
SSDs have advantages over HDDs like faster speeds without seek times, but are more expensive. Various caching methods leverage SSD speed while retaining HDD capacity. DM-cache, Flashcache, Bcache, and EnhanceIO all use SSDs to cache hot data for faster access without extra storage management. Each has advantages like transparency or ability to cache partitions, but DM-cache may have metadata limits while Bcache uses system memory. A hybrid system provides the best features of both SSDs and HDDs.
Ch9 OS
This document discusses several memory management techniques:
1. Contiguous allocation allocates processes to contiguous regions of memory but can lead to fragmentation.
2. Paging divides memory into pages and processes into page tables to map virtual to physical addresses, reducing fragmentation. It uses translation lookaside buffers (TLBs) to speed address translation.
3. Segmentation divides processes into logical segments and uses segment tables to map segments to physical addresses. It provides a modular view of memory but external fragmentation remains an issue.
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CS 542 Putting it all together -- Storage Management
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みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
ここ3000字までしか入らないけどタイトルの方がたくさん文字入ると思います。
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みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
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Vmfs
- 2. Virtual Memory :)
- 14. DIRECTORY.CC
- 19. SYNCHDISK.CC
- 24. HARD DISK DRIVE The hard drive is a magnetic device that stores all programs and computer data Its storage capacity is measured in gigabytes (GB) and is higher than that of a disk (floppy). They are usually built into the motherboard where you can connect more than one, but there are external drives that connect to the PC via a USB connector
- 25. LIFE OF HARD DISK DRIVE BM has concluded that using Linux extends the life of a hard disk 10% because the same tasks to reduce recourse to disk. They usually last from 5 to 8 years but there are computers that have a record of 12 years and work without problem, this is also due to the use of the same
- 26. FINDING THE TIME OF LIFE HARD DISK DRIVE http :// bicosyes.com /numero-de-horas-de-vida-de-un-disco-duro/
- 27. SATA SATA I SATA II SATA III FRECUENCIA 1500 MHz 3000 MHz 6000 MHz Bits/clock 1 1 1 Codificacion 8b 10b 80% 80% 80% Bits/Byte 8 8 8 Velocidad real 150 MB/s 300 MB/s 600 MB/s
- 28. MEANING OF PIN Pin 1 GND Masa Pin 2 HT+/DR+ Transmisión diferencial + Pin 3 HT-/DR- Transmisión diferencial - Pin 4 GND Masa Pin 5 HR-/DT- Recepción diferencial - Pin 6 HR-/DT+ Recepción diferencial + Pin 7 GND Masa
- 29. SATA external disk Speed SATA external drives (it measured 115 MB s with external RAID) No protocol conversion PATA / SATA to USB/ Firewire, all disk features are available for the host. The cable length is restricted to 2 meters, USB and FireWire allow longer distances. Voltage was increased minimum and maximum transmission 500mV - 600mV (400 mV - 600mV) Voltage dropped to 240 mV received - 600 mV (325 mV - 600 mV) Available capacity of the disks in RAID 0 and RAID
- 30. SCSI Use CCS (Common Command Set). It is a command in a paragraph Set Access Devices that make them more or less compatible
- 32. SATA Vs SCSI SATA SCSI Cheaper Some manufacturers put in its specifications that the discs are made to operate between 8 and 11 hours a day For a database server is fully recommended to use SCSI disks. the value that you give your data is very important - if they are important, not use ATA or Serial-ATA
- 33. raid The acronym RAID means "Redundant Array of Inexpensive Disks" (Redundant Array of Inexpensive Disks). The term was used to compare inexpensive disks RAID sets small, relatively inexpensive, as compared to a single disk, large and expensive (SLED, single large expensive disk). Today, the term is outdated SLED
- 35. FLASH MEMORY Time nonvolatile memory that is often used in cell phones, digital cameras, PDAs, laptops, hard drives. Can be erased and rewritten. They are an evolution of EEPROM that allows multiple memory locations to be written or erased in one operation using electrical impulses
- 36. MEMORIA FLASH Vs Hard Disk advantage disadvantages Small size, making it ideal for transporting data Limited lifespan, allow about 100,000 write cycles nothing more Very low power consumption, this is especially the battery-powered equipment Lower speed than a hard drive, especially in writing Capacidad menor que la de un disco duro Price per GB significantly higher than that of a hard disk