CA2165912A1 - Write anywhere file-system layout - Google Patents
Write anywhere file-system layoutInfo
- Publication number
- CA2165912A1 CA2165912A1 CA002165912A CA2165912A CA2165912A1 CA 2165912 A1 CA2165912 A1 CA 2165912A1 CA 002165912 A CA002165912 A CA 002165912A CA 2165912 A CA2165912 A CA 2165912A CA 2165912 A1 CA2165912 A1 CA 2165912A1
- Authority
- CA
- Canada
- Prior art keywords
- anode
- file
- file system
- disk
- blocks
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/10—File systems; File servers
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Data Mining & Analysis (AREA)
- Databases & Information Systems (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Information Retrieval, Db Structures And Fs Structures Therefor (AREA)
Abstract
The present invention provides a method for keeping a file system in a consistent state and for creating read-only copies of a file system. Changes to the file system are tightly controlled. The file system progresses from one consistent state to another. The set of self-consistent blocks on disk that is rooted by the root anode is referred to as a consistency point. To implement consistency points, new data is written to unallocated blocks on disk. A new consistency point occurs when the fsinfo block (2440) is updated by writing a new root anode for the anode file (1210) into it. Thus, as long as the root anode is not updated, the state of the file system represented on disk does not change. The present invention also creates snapshots (Figure 22) that are read-only copies of the file system. A snapshot uses no disk space when it is initially created. It is designed so that many different snap shots can be created for the same file system. Unlike prior art file systems that create a clone by duplicating the entire anode file and all of the indirect blocks, the present invention duplicates only the anode that describes the anode file. A multi-bit free-block map file (1630) is used to prevent data from being overwritten on disk.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002165912A CA2165912C (en) | 1995-12-21 | 1995-12-21 | Write anywhere file-system layout |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002165912A CA2165912C (en) | 1995-12-21 | 1995-12-21 | Write anywhere file-system layout |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2165912A1 true CA2165912A1 (en) | 1997-06-22 |
CA2165912C CA2165912C (en) | 2004-05-25 |
Family
ID=4157219
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002165912A Expired - Lifetime CA2165912C (en) | 1995-12-21 | 1995-12-21 | Write anywhere file-system layout |
Country Status (1)
Country | Link |
---|---|
CA (1) | CA2165912C (en) |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7426618B2 (en) | 2005-09-06 | 2008-09-16 | Dot Hill Systems Corp. | Snapshot restore method and apparatus |
US7593973B2 (en) | 2006-11-15 | 2009-09-22 | Dot Hill Systems Corp. | Method and apparatus for transferring snapshot data |
US7716183B2 (en) | 2007-04-11 | 2010-05-11 | Dot Hill Systems Corporation | Snapshot preserved data cloning |
US7783850B2 (en) | 2006-03-28 | 2010-08-24 | Dot Hill Systems Corporation | Method and apparatus for master volume access during volume copy |
US7783603B2 (en) | 2007-05-10 | 2010-08-24 | Dot Hill Systems Corporation | Backing store re-initialization method and apparatus |
US7831565B2 (en) | 2007-01-18 | 2010-11-09 | Dot Hill Systems Corporation | Deletion of rollback snapshot partition |
US7975115B2 (en) | 2007-04-11 | 2011-07-05 | Dot Hill Systems Corporation | Method and apparatus for separating snapshot preserved and write data |
US8001345B2 (en) | 2007-05-10 | 2011-08-16 | Dot Hill Systems Corporation | Automatic triggering of backing store re-initialization |
US8200631B2 (en) | 2007-06-25 | 2012-06-12 | Dot Hill Systems Corporation | Snapshot reset method and apparatus |
US8751467B2 (en) | 2007-01-18 | 2014-06-10 | Dot Hill Systems Corporation | Method and apparatus for quickly accessing backing store metadata |
US8990153B2 (en) | 2006-02-07 | 2015-03-24 | Dot Hill Systems Corporation | Pull data replication model |
CN116048384A (en) * | 2022-11-02 | 2023-05-02 | 中国科学院空间应用工程与技术中心 | Writing method and system of metadata of file system |
-
1995
- 1995-12-21 CA CA002165912A patent/CA2165912C/en not_active Expired - Lifetime
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7426618B2 (en) | 2005-09-06 | 2008-09-16 | Dot Hill Systems Corp. | Snapshot restore method and apparatus |
US8990153B2 (en) | 2006-02-07 | 2015-03-24 | Dot Hill Systems Corporation | Pull data replication model |
US7783850B2 (en) | 2006-03-28 | 2010-08-24 | Dot Hill Systems Corporation | Method and apparatus for master volume access during volume copy |
US7593973B2 (en) | 2006-11-15 | 2009-09-22 | Dot Hill Systems Corp. | Method and apparatus for transferring snapshot data |
US8751467B2 (en) | 2007-01-18 | 2014-06-10 | Dot Hill Systems Corporation | Method and apparatus for quickly accessing backing store metadata |
US7831565B2 (en) | 2007-01-18 | 2010-11-09 | Dot Hill Systems Corporation | Deletion of rollback snapshot partition |
US7975115B2 (en) | 2007-04-11 | 2011-07-05 | Dot Hill Systems Corporation | Method and apparatus for separating snapshot preserved and write data |
US8656123B2 (en) | 2007-04-11 | 2014-02-18 | Dot Hill Systems Corporation | Snapshot preserved data cloning |
US7716183B2 (en) | 2007-04-11 | 2010-05-11 | Dot Hill Systems Corporation | Snapshot preserved data cloning |
US8001345B2 (en) | 2007-05-10 | 2011-08-16 | Dot Hill Systems Corporation | Automatic triggering of backing store re-initialization |
US7783603B2 (en) | 2007-05-10 | 2010-08-24 | Dot Hill Systems Corporation | Backing store re-initialization method and apparatus |
US8200631B2 (en) | 2007-06-25 | 2012-06-12 | Dot Hill Systems Corporation | Snapshot reset method and apparatus |
US8204858B2 (en) | 2007-06-25 | 2012-06-19 | Dot Hill Systems Corporation | Snapshot reset method and apparatus |
CN116048384A (en) * | 2022-11-02 | 2023-05-02 | 中国科学院空间应用工程与技术中心 | Writing method and system of metadata of file system |
Also Published As
Publication number | Publication date |
---|---|
CA2165912C (en) | 2004-05-25 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKEX | Expiry |
Effective date: 20151221 |