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Re: [linux-lvm] meaning of -L for snapshots ?





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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