Olivier Kaloudoff wrote:
Who can explain the usage of -L10M for my snapshot ?
LVM snapshots have a limitation to how much data can change before the
snapshot becomes invalid. So, by using -L10M, you're saying to keep the
snapshot around until 10M of data has changed, then the snapshot becomes
invalid.
Because of the way LVM snapshots work, they require extra space on a
volume. So, the size of your snapshot volume dictates how long it will
remain valid. A good rule of thumb is between 10% and 20% of your
primary volume's size. That way, 10 to 20% of the filesystem's contents
can change and your snapshot will remain valid.
Hope this clears some things up for you.
-Kelsey
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