- Copy on Write allows processes to share pages rather than each having a separate copy of the pages.
- However, when one process tried to write to a shared page, then a trap is generated and the OS makes a separate copy of the page for each process.
What is the copy on write feature?
- Copy-on-write or CoW is a technique to efficiently copy data resources in a computer system. If a unit of data is copied but not modified, the "copy" can exist as a reference to the original data.
- Only when the copied data is modified is a copy created, and new bytes are actually written.
What are the benefits of copy on write?
- The major advantage of copy-on-write is that it's incredibly space efficient because the reserved snapshot storage only has to be large enough to capture the data that's changed.
- But the well-known downside to copy-on-write snapshot is that it will reduce performance on the original volume.
What is copy on write in page sharing?
Copy-on-write (COW), sometimes referred to as implicit sharing or shadowing, is a resource-management technique used in computer programming to efficiently implement a "duplicate" or "copy" operation on modifiable resources.
Learn more about Copy-on-write
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