Question

What is the copy-on-write feature, and under what circumstances is it beneficial to use this feature?

Answer 1

• 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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