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Maciej Piechotka
Asked: 2010-08-10 07:53:57 +0800 CST

LVM 2 snapshots and free blocks

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LVM 2 snapshots works as COW. However the block may change even if it is not used anymore. As SSD disks may need marking of free/used blocks to better manage blocks, the API was introduced into Linux to mark free/used blocks.

My question is - does LVM use this API? I.e. are blocks are copied on every change or only if filesystem cares about contents?

linux lvm snapshot

1 Answers

  1. Best Answer

    Blocks are copied on every change.

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