the google file system review

The Design and Implementation of a Log-Structured File System

The Design and Implementation of a Log-Structured File System

... log-structured file systems. In a log-structured file system, free space for the log can be generated either by copying the old blocks or by threading the log around the old blocks. The left side of the figure ...  ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁ ✁  systems view the log as the most up to date ‘‘truth’’ about the state of the data on disk. The main difference is that database systems do not use the log as the final repository for ... one-kilobyte files, then read them back in the same order as created, then delet- ed them. Speed is measured by the number of files per second for each operation on the two file systems. The logging approach...

Ngày tải lên: 12/09/2012, 15:05

15 1,4K 0
A Fast File System for UNIX

A Fast File System for UNIX

... Fast File System for UNIX Both reads and writes are faster in the new system than in the old system. The biggest factor in this speedup is because of the larger block size used by the new file system. ... space between the end of the boot block and the beginning of the cylinder group. Without knowing the size of the file system blocks, the system would not know what roundup function to use to find the beginning ... new data). If the size of the new data plus the size of the data already in the fragments exceeds the size of a full block, a new block is allocated. The contents of the fragments are copied to the beginning...

Ngày tải lên: 12/09/2012, 14:16

14 1K 0
Windows 2003 EFS EFS (Encrypting File System)

Windows 2003 EFS EFS (Encrypting File System)

... Topic 3F Windows 2003 EFS EFS (Encrypting File System) cho phép người dùng mã hóa dữ liệu, thông tin cá nhân được lưu trữ trên máy tính nhằm ... Prompt TASK 3F-1 Encryting Files 1. Tại phân vùng NTFS, tạo một text document với tên Mine.txt và một số văn bản ở trong đó. 2. Mở Explorer, và hiển thị thuộc tính của file Mine.txt. 3. Click Advanced, ... sử dụng FEK để giải mã nội dung tập tin mà ứng dụng yêu cầu. Như vậy public key, private key, file encryption key là các yếu tố quan trọng của quá trình mã hóa và giải mã. ...

Ngày tải lên: 14/09/2012, 09:57

3 973 3
Báo cáo y học: "Does switching from oral extended-release methylphenidate to the methylphenidate transdermal system affect health-related quality-of-life and medication satisfaction for children with attention-deficit/hyperactivity disorder&

Báo cáo y học: "Does switching from oral extended-release methylphenidate to the methylphenidate transdermal system affect health-related quality-of-life and medication satisfaction for children with attention-deficit/hyperactivity disorder&

... across the United States; the Institutional Review Board at each site or a central Institu- tional Review Board approved the study. The subject agreed to the study and the subject's caregiver ... in the investigator's opinion there was poten- tial for further symptom reduction, try the next higher dose. No further titration was permitted after the final dose-adjustment visit at the ... applied to intact skin [22]. The dose of drug delivered depends on the surface area of the patch and the length of time that the patch is worn, which allows for tailoring the duration of medication effect...

Ngày tải lên: 25/10/2012, 10:06

12 758 0
ENHANCING THE EFFICIENCY OF THE QUALITY MANAGAMENT SYSTEM BY IMPROVING MANAGEMENT RESPONSIBILITY AND HUMAN RESOURCE MANAGEMENT AT VIET A PLASTIC AND COMPOSITE COMPANY

ENHANCING THE EFFICIENCY OF THE QUALITY MANAGAMENT SYSTEM BY IMPROVING MANAGEMENT RESPONSIBILITY AND HUMAN RESOURCE MANAGEMENT AT VIET A PLASTIC AND COMPOSITE COMPANY

... implement the process of the quality management system of the company based on the voluntary and self-control spirit. The regular discussions among them will contribute to enhance the effectiveness of ... Providing adequate resources for the operation of the quality management system • Reviewing the operation of the quality management system 2.2.1 Establishing the quality policies focus on customer ... management system There are eight quality management principles on which the quality management system standards of the ISO series are based. These principles have been identified to facilitate the...

Ngày tải lên: 18/04/2013, 17:09

33 934 5
Sửa lỗi thiếu file System và Software không vào được Windows

Sửa lỗi thiếu file System và Software không vào được Windows

... điền vào và nhấn Enter Đối với máy bị hư file SYSTEM thì bạn làm như sau Tại dấu nhắc C:\WINDOWS\ bạn nhập cd SYSTEM3 2 < Enter sau đó sẽ ra C:\WINDOWS \SYSTEM3 2\ tại đây bạn nhập tiếp CD CONFIG ... lại Windows???? theo lời thông báo của nó???? Nhưng không, cách sau đây chỉ cần dưới 5 phút là bạn sẽ giải quyết được sự cố của nó Tùy theo trường hợp của bạn là mất fileSYSTEM hay là SOFTWARE ... ra C:\WINDOWS \SYSTEM3 2\ tại đây bạn nhập tiếp CD CONFIG < Enter thì sẽ ra 3 Sửa lỗi thiếu file System và Software không vào được Windows Một ngày đẹp trời nào đó, bật máy lên không vào được...

Ngày tải lên: 25/06/2013, 01:25

4 599 0
Sửa lỗi thiếu file System và Software không vào được Windows

Sửa lỗi thiếu file System và Software không vào được Windows

... pháp: ren system system.old < Enter Suy ra nguyên 1 hàng nó sẽ là C:WINDOWSSYSTEM32CONFIGREN SYSTEM SYSTEM.OLD Mục đích của cú pháp đó là ren < Rename fille system trong máy thành file system. old Sau ... C:Windows epairsystem < Enter Suy ra nguyên dòng sẽ là CODE C:WINDOWSSYSTEM32CONFIGCOPY C:WINDOWSREPAIRSYSTEM < Enter Mục đích của code trên là copy file SYSTEM từ thư mục Repair, file này là file ... bị hư file SYSTEM thì bạn làm như sau Tại dấu nhắc C:WINDOWS bạn nhập cd SYSTEM3 2 < Enter sau đó sẽ ra C:WINDOWSSYSTEM32 tại đây bạn nhập tiếp CD CONFIG < Enter thì sẽ ra C:WINDOWSSYSTEM32CONFIG Từ...

Ngày tải lên: 01/07/2013, 01:25

3 1,2K 2
Analysis of Phosphorus Behavior in the Giant Reed for Phytoremediation and the Biomass Production System

Analysis of Phosphorus Behavior in the Giant Reed for Phytoremediation and the Biomass Production System

... watts. The distance from the fluorescent lamp to the top of the giant reeds was about 0.2 m at the start of the experiment. The temperature in the experimental room was kept at about 28 °C. The ... plants including the roots and rhizomes are cropped except for the roots and rhizomes remaining for the next year. Thereafter, the giant reeds grow with the rhizome extension, and the giant reed ... that the phosphorus in each leaf decreased with temperature. Furthermore, the decreasing of phosphorus occurred in the order from the bottom to the top, and this order was relevant to the dying...

Ngày tải lên: 05/09/2013, 09:38

12 1K 0
File System and Disk Administration

File System and Disk Administration

... Linux ext2 Kiểu filesystem đợc dùng chủ yếu trên Linux partition. iso9660 Kiểu ISO 9660 filesystem đợc dùng với CD-ROM disks. sysv Kiểu Nhằm hỗ trợ cho dạng UNIX System V filesystem. msdos ... dới Linux systems: # # Sample /etc/fstab file for a Linux machine # # Local mounts /dev/sda1 / ext2 defaults 1 1 mkswap /dev/hda2 2. Mounting and unmounting file systems Mounting file systems Nh ... /lost+found Cha các file đợc recover bởi fsck. 1. Creating file systems Để tạo hệ thống file cần thực hiện các bớc nh sau: Chọn quyền hạn của đĩa. Tạo các partition Tạo file system Mỗi loại...

Ngày tải lên: 28/09/2013, 11:20

10 521 0
The Microsoft Office System

The Microsoft Office System

... the chapter, the manifest file contains the details regarding the con- tents of the XML expansion pack. Using Visual Studio, add a new XML file named manifest.xml to the project. Modify the file ... the dialog. 4. Locate the reference to the portal in the Look In list. 5. Right-click the icon and select Move Up from the pop-up menu until the icon is at the top of the list. CHAPTER 8 ■ THE ... assembly, and a schema. The manifest is an XML file that tells the Office product what files make up the Smart Document solution. The assembly is the CHAPTER 8 ■ THE MICROSOFT OFFICE SYSTEM 241 Figure...

Ngày tải lên: 05/10/2013, 14:20

48 373 0
Visual Studio 2005 and the Microsoft Office System

Visual Studio 2005 and the Microsoft Office System

... project. In the Solution Explorer, select the file ThisDocument.vb and click the View Code button. Then add the following code to the project: Imports System Imports System. Data Imports System. Data.SqlClient Imports ... template. 3. In the Location drop-down list, select File System. 4. Click the Browse button. 5. In the Choose Location dialog, select a location in the file system tree to create the new web site. 6. ... select File System. 4. In the Language drop-down list, select Visual C#. 5. Click the Browse button. 6. In the Choose Location dialog, select a location in the file system tree to create the new...

Ngày tải lên: 05/10/2013, 14:20

30 647 0
File system and Disk Administration

File system and Disk Administration

... newfs), mkswap tạo swap file system. Ví dụ mke2fs /dev/hda1 mkswap /dev/hda2 3. Mounting and unmounting file systems Mounting file systems Như ta đ biêt hệ thống file của UNIX được lưu ... các thay đổi vừa tạo. Tạo File Systems: Sau khi đ tạo partition thì hệ thống file vẫn chưa được sẵn sàng cho việc sử dung. mà cần phải tạo file system. Để tạo hệ thống file trong Linux dùng lệnh ... /lost+found Chưa các file được recover bởi fsck. 2. Creating file systems Giới thiệu về UNIX- Một số thao tác cơ bản trên UNIX 77 ỹ sysv Kiểu Nhằm hỗ trợ cho dạng UNIX System V filesystem. ỹ msdos...

Ngày tải lên: 09/10/2013, 13:20

10 322 0
Programming the Be Operating System-Chapter 9: Messages and Threads

Programming the Be Operating System-Chapter 9: Messages and Threads

... with system messages—messages generated and dispatched by the system. The Message Protocols appendix of the Be Book defines all the system messages. In short, system messages fall into the following categories: Application ... posted message becomes the next in the queue, the looper invokes DispatchMessage() to pass the message to the target handler. The effect is for the posted message to reach the target handler’s ... sev- eral examples of the creating of messages and the dispatching of these messages both by the object that created them and by other objects. Figure 9-1. The inheritance hierarchy for the Application...

Ngày tải lên: 17/10/2013, 19:15

37 542 0
Advanced File System Management

Advanced File System Management

... mount the file system; therefore, most file systems keep backup superblocks at different locations in the file system. In that case, if the real file system gets broken, you can mount using the ... journal. Changes in file system metadata are stored in it until the file system has time to commit these changes to the data section. When the file system crashes, upon mount, the file system can read ... of these is the data section. This is the only section that is created by default. The other two sections are the log section and the real- time section. Organization of the XFS File System The...

Ngày tải lên: 19/10/2013, 02:20

22 371 0
Programming the Be Operating System-Chapter 10: Files

Programming the Be Operating System-Chapter 10: Files

... an Open file panel, that’s typically when the user chooses the Open item from the File menu. For the Save file panel, the display of the panel comes when the user chooses the Save As item from the File ... saving a file using POSIX, then at saving a file with the Storage Kit. Using POSIX to save a file To work with files, you can use either the BFile class or a POSIX file of type FILE. Here file- saving ... function of the Save file panel’s target. Recall that in the FileBase program the second parameter passed to the BFilePanel constructor specified that the window be the target of the Save file panel....

Ngày tải lên: 20/10/2013, 10:15

18 406 1

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