File Systems - Computer Science Department
... • UNIX permits users to share a file. • Multiple concurrent accesses are possible. If two I/O operations start at about the same time, serial access is enforced to make sure data is consistent. That is, one operation is performed in its entirety before the next one begins. • However, a read from use ...
... • UNIX permits users to share a file. • Multiple concurrent accesses are possible. If two I/O operations start at about the same time, serial access is enforced to make sure data is consistent. That is, one operation is performed in its entirety before the next one begins. • However, a read from use ...
File Systems - Personal Web Pages
... hierarchical tree. Each directory can contain files and subdirectories. Directories are implemented as a special type of files. Actually, a directory is a file containing a list of entries. Each entry contains an inode number and a file name. When a process uses a pathname, the kernel code searches ...
... hierarchical tree. Each directory can contain files and subdirectories. Directories are implemented as a special type of files. Actually, a directory is a file containing a list of entries. Each entry contains an inode number and a file name. When a process uses a pathname, the kernel code searches ...
Comparison and Performance Evaluation of SAN File System
... Implement these Micro-benchmarks. Build a micro-benchmark suite for SAN file system Build a adaptable and widely-used benchmark to measure SAN file system performance. ...
... Implement these Micro-benchmarks. Build a micro-benchmark suite for SAN file system Build a adaptable and widely-used benchmark to measure SAN file system performance. ...
File-Management
... • Create- find space in file system, make entry in the file system • Write- make system call to specify name and information content of the file to b written in the file. • Read- system call specifying the name and the location in the memory where that file has to put • Reposition within file- searc ...
... • Create- find space in file system, make entry in the file system • Write- make system call to specify name and information content of the file to b written in the file. • Read- system call specifying the name and the location in the memory where that file has to put • Reposition within file- searc ...
Gfarm Grid File System Osamu Tatebe University of Tsukuba
... Create multiple file replicas to increase performance and reliability Create file replicas at distant locations for disaster recovery Open Source Software Linux binary packages, ports for *BSD, . . . It is included in Naregi, Knoppix HTC edition, and Rocks cluster distribution ...
... Create multiple file replicas to increase performance and reliability Create file replicas at distant locations for disaster recovery Open Source Software Linux binary packages, ports for *BSD, . . . It is included in Naregi, Knoppix HTC edition, and Rocks cluster distribution ...
An Introduction to MS-DOS
... Additional information after BPB indicates that there are 9 sectors per track, 2 read/ write heads, and 0 hidden sectors. ...
... Additional information after BPB indicates that there are 9 sectors per track, 2 read/ write heads, and 0 hidden sectors. ...
File Systems - The University of Alabama in Huntsville
... FFS Enhancements • Two important changes made in FFS were designed to make file operations more efficient either by reducing the number or length of seeks. – Large block size – Cylinder groups ...
... FFS Enhancements • Two important changes made in FFS were designed to make file operations more efficient either by reducing the number or length of seeks. – Large block size – Cylinder groups ...
Introduction to MS Access - San Francisco State University
... – Don’t use the default ID field for primary key. Use a meaningful entity key field. ...
... – Don’t use the default ID field for primary key. Use a meaningful entity key field. ...
CRSP SuRvivoR-biaS-fRee uS mutual fund databaSe April 2013 quArterly updAte
... The holdings file in the Mutual Funds database hit a milestone this month in exceeding 4 GB in size. As a result, CRSP provides a new ZIP install of the database that can more easily handle large files than the previously used InstallAnywhere process. While introduced sooner than planned, the plan t ...
... The holdings file in the Mutual Funds database hit a milestone this month in exceeding 4 GB in size. As a result, CRSP provides a new ZIP install of the database that can more easily handle large files than the previously used InstallAnywhere process. While introduced sooner than planned, the plan t ...
Think Global, Work Local, FAST™
... With Talon FAST™ software, your distributed users are guaranteed an optimal application experience, accessing and collaborating on data in real-time, which feels as if they’re all working from the same office. ...
... With Talon FAST™ software, your distributed users are guaranteed an optimal application experience, accessing and collaborating on data in real-time, which feels as if they’re all working from the same office. ...
The broken file shredder
... Journaling file systems may create additional temporary copies of data (Ext3fs: journal=data). Copy-on-write file systems (like Solaris ZFS) never overwrite a disk block that is “in use”. None of these problems exist with file systems that encrypt each file with its own encryption key. ...
... Journaling file systems may create additional temporary copies of data (Ext3fs: journal=data). Copy-on-write file systems (like Solaris ZFS) never overwrite a disk block that is “in use”. None of these problems exist with file systems that encrypt each file with its own encryption key. ...
chapter4
... a) Hot set: a set of pages which is accessed over and over b) Least recently used -> this is going to be removed first when RAM gets full. D. Mapping software view to hardware 1) Field: data type describing attribute of entity, representing a column of table 2) Record: a collection of fields of the ...
... a) Hot set: a set of pages which is accessed over and over b) Least recently used -> this is going to be removed first when RAM gets full. D. Mapping software view to hardware 1) Field: data type describing attribute of entity, representing a column of table 2) Record: a collection of fields of the ...
Database Size
... backup. If there is insufficient space on the hard drive where Jim2 is stored, this backup will fail. An easy check is to view the file size of the backup file – if it is 1KB, the backup file is probably incomplete. On a regular basis, check your backups by restoring the most recent backup to a Jim2 ...
... backup. If there is insufficient space on the hard drive where Jim2 is stored, this backup will fail. An easy check is to view the file size of the backup file – if it is 1KB, the backup file is probably incomplete. On a regular basis, check your backups by restoring the most recent backup to a Jim2 ...
Xerox PARCTAB
... CeOpenDatabaseEx() to open an existing database – can ask to be notified if someone else modifies when in use. • CeWriteRecordProps() to create or update a record. • Each call to CeReadRecordProps() returns the next record in the specified sort order (at open) • CeSeekDatabase() to seek to a specifi ...
... CeOpenDatabaseEx() to open an existing database – can ask to be notified if someone else modifies when in use. • CeWriteRecordProps() to create or update a record. • Each call to CeReadRecordProps() returns the next record in the specified sort order (at open) • CeSeekDatabase() to seek to a specifi ...
Windows Server 2008
... • Support for FAT32 started with Windows 95 Release 2 • Designed to accommodate larger capacity disks • FAT32: – Root folder does not have to be at the beginning of a volume – Can use disk space more efficiently than FAT16 (because it uses smaller cluster sizes) – Largest volume that can be formatte ...
... • Support for FAT32 started with Windows 95 Release 2 • Designed to accommodate larger capacity disks • FAT32: – Root folder does not have to be at the beginning of a volume – Can use disk space more efficiently than FAT16 (because it uses smaller cluster sizes) – Largest volume that can be formatte ...
The Macintosh File System (continued)
... • OS typically groups disk sectors in some logical way, creates a record of this structure, and builds a directory to track the type of data stored in each file ...
... • OS typically groups disk sectors in some logical way, creates a record of this structure, and builds a directory to track the type of data stored in each file ...
File Systems
... of the superblock. The superblock is stored in a different position on each cylinder group, so damage to one surface won’t ruin all copies of the superblock. • For performance, the cylinder group contains related information (e.g., inodes and the data blocks they reference) to reduce seek times. ...
... of the superblock. The superblock is stored in a different position on each cylinder group, so damage to one surface won’t ruin all copies of the superblock. • For performance, the cylinder group contains related information (e.g., inodes and the data blocks they reference) to reduce seek times. ...
Solution to Lab Project 2.1
... 4. The DOS bootup process starts with the PC bootup process, beginning from either a cold or warm boot, which causes the processor to load a special program (the POST), residing on ROM BIOS, into memory. After this program completes, another program searches for an operating system on drive A: (if t ...
... 4. The DOS bootup process starts with the PC bootup process, beginning from either a cold or warm boot, which causes the processor to load a special program (the POST), residing on ROM BIOS, into memory. After this program completes, another program searches for an operating system on drive A: (if t ...
Incident management - Marc
... references, sources and bibliographical information is available in the commentaries section of the PowerPoint presentation and may not be visible to viewers of PDF versions. • The course instructor has no pretensions to be the original author of any of the material. ...
... references, sources and bibliographical information is available in the commentaries section of the PowerPoint presentation and may not be visible to viewers of PDF versions. • The course instructor has no pretensions to be the original author of any of the material. ...
DBMS File Structure
... Open: A file can be opened in one of two modes, read mode or write mode. In read mode, operating system does not allow anyone to alter data it is solely for reading purpose. Files opened in read mode can be shared among several entities. The other mode is write mode, in which, data modification is a ...
... Open: A file can be opened in one of two modes, read mode or write mode. In read mode, operating system does not allow anyone to alter data it is solely for reading purpose. Files opened in read mode can be shared among several entities. The other mode is write mode, in which, data modification is a ...
- Mitra.ac.in
... • There are two basic methods for arranging these sectors on a disc: 1) placed in concentric rings (called tracks) of equal angle per sector 2) the other is to have them in an Archimedean spiral with the physical length of sectors along the disc kept constant instead of the angle. ...
... • There are two basic methods for arranging these sectors on a disc: 1) placed in concentric rings (called tracks) of equal angle per sector 2) the other is to have them in an Archimedean spiral with the physical length of sectors along the disc kept constant instead of the angle. ...
Files and Directories
... – Inefficient for tiny files (a 1 byte file requires both an inode and a data block) – Inefficient encoding when file is mostly contiguous on disk (no equivalent to superpages) – Need to reserve 10-20% of free space to prevent fragmentation ...
... – Inefficient for tiny files (a 1 byte file requires both an inode and a data block) – Inefficient encoding when file is mostly contiguous on disk (no equivalent to superpages) – Need to reserve 10-20% of free space to prevent fragmentation ...