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redirect on write (snapshot) (RoW)

There are several snapshot methods for taking snapshots. Among the better known are Copy-on-Write( CoW) and Redirect-on-Write(RoW).

The RoW method stands for " redirect on write", it has better performance than Copy-on-Write and is more suitable for longer-term snapshot storage.

During the first snapshot, metadata about the occupied data blocks is collected and a list is created of all data blocks stored on disk. Subsequently, only the changes to the data blocks are stored in the history files. The snapshots and the history directory are stored on a shared disk. When changes are made to the data blocks, they are redirected to the storage area where the snapshots are located.

Englisch: redirect on write (snapshot) - RoW
Updated at: 26.04.2018
#Words: 110
Links: snapshot, copy on write (backup) (CoW), method, redirect, performance
Translations: DE

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