Speed snapshots and compressed backups of MongoDB using LVM

Here using LVM Logical disk for MongoDB, MongoDB to more than dozens of G, the speed of backup with the MongoDB tool, will make us feel very slow pain, this time we can carry out the MONGDB Data directory for LVM snapshot backup.

LVM reference under my another article http://rfyiamcool.blog.51cto.com/1030776/959704

Principle: Take a picture of the LVM from the LVM snapshot, when the LVM physically sends the changes, the LVM snapshots store the contents of the LVM's true changes on the snapshot, so that during the time that the LVM snapshot is in effect, the content of the LVM snapshot we see is always the content of the LVM's true, when creating the LVM snapshot, Back up the LVM snapshots to achieve online backup of the LVM. Note that when the LVM snapshot is more than the LVM, the LVM snapshots become unreadable and fail if the LVM is changed more than the LVM snapshot. If the LVM snapshot is greater than or equal to the LVM, the preceding situation does not occur.