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[linux-lvm] lvm snapshot query



I have a question regarding LVM snapshots to provide multiple snapshots of a directory during a day/week.


Having looked around, it seems an ideal solution to a problem I am looking at, but I am concerned about performance.


Looking at http://tldp.org/HOWTO/LVM-HOWTO/snapshots_backup.html it seems to indicate that is the snapshot will be a performance issue until its released. I don’t think I fully understand why ?


Is it so it can rollback the writes to get to the original snapshot ? The reason I ask is that on something like a netapp, you have the same functionality without the performance penalty implied in the snapshot discussion.



If I want to have multiple snapshots through the day/week. Is using LVM snapshots alone a good solution is should some rsync solution be used as well to avoid the performance hit ? Or can LVM on its own provide a solution without a performance hit ?


Thanks for any clarification. Apologies if this is the incorrect forum for this, but I am specifically concerned about LVM implementation as in Nahant.




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