7.3. Merging snapshot to its original volume
Use the lvconvert command with the --merge option to merge a snapshot into its original (the origin) volume. You can perform a system rollback if you have lost data or files, or otherwise you have to restore your system to a previous state. After you merge the snapshot volume, the resulting logical volume has the origin volume’s name, minor number, and UUID. While the merge is in progress, reads or writes to the origin appear as they were directed to the snapshot being merged. When the merge finishes, the merged snapshot is removed.
If both the origin and snapshot volume are not open and active, the merge starts immediately. Otherwise, the merge starts after either the origin or snapshot are activated and both are closed. You can merge a snapshot into an origin that cannot be closed, for example a root file system, after the origin volume is activated.
Procédure
Merge the snapshot volume. The following command merges snapshot volume vg001/snap into its origin:
# lvconvert --merge vg001/snap Merging of volume vg001/snap started. vg001/origin: Merged: 100.00%
View the origin volume:
# lvs -a -o +devices LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert Devices origin vg001 owi-a-s--- 1.00g /dev/sde1(0)
Ressources supplémentaires
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lvconvert(8)man page
