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Friday, 18 July 2014

What is a Mirror Log ?


LVM maintains a small log which it uses to keep track of which regions are in sync with the mirror or mirrors. 

By default, this log is kept on disk, which keeps it persistent across reboots and ensures that the mirror does not need to be re-synced every time a machine reboots or crashes. 

You can specify instead that this log be kept in memory with the --mirrorlog core argument; this eliminates the need for an extra log device, but it requires that the entire mirror be resynchronized at every reboot.

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