JLS2009: A Btrfs update
Posted Oct 30, 2009 16:11 UTC (Fri) by giraffedata
Parent article: JLS2009: A Btrfs update
Doing snapshots at the device mapper/LVM layer involves making a lot more copies of the relevant data. Chris ran an experiment where he created a 400MB file, created a bunch of snapshots, then overwrote the file. Btrfs is able to just write the new version, while allowing all of the snapshots to share the old copy. LVM, instead, copies the data once for each snapshot.
I don't follow. LVM doesn't have snapshots of a volume share blocks?
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