CODEWITHSUNDEEP
storagesnapshotcopy-on-writeread-committed-snapshot
Suresh Tirumala
Suresh Tirumala

Reputation: 41

COW vs ROW snapshot Technologies

While Im reading about the Snapshot Technology...I found Copy-On-Write (COW) and Redirect-On-Write (ROW) a quite Confusing to Understand the actual Operations they are Committing to...Will Somebody Please Explain me How They are Working Actually...

Thank you

Upvotes: 3

Views: 6636

Answers (1)

stark
stark

Reputation: 13189

COW copies the old value to a separate area in the snapshot before writing the new data in the original place. This means a file will stay contiguous. ROW writes to a new area, and keeps the original data in the snapshot. This saves the copy, so it is faster, but makes files noncontiguous.

Upvotes: 9

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