Store Logs Centrally
This is post #7 in my December 2013 series about Linux Virtual Machine Performance Tuning. For more, please see the tag “Linux VM Performance Tuning.” It is universally true that over time a thin-provisioned virtual machine will slowly expand on disk. This happens because of the way files are deleted from disks. When files are written to disk the storage subsystem writes those blocks out, and the thinly-provisioned disk file grows a bit. But when a filesystem deletes a file all it does is update its own internal storage map to “forget” about the file. Nothing ever removes the data from the disk itself (which is why undelete utilities work, and why there are stringent procedures for securely erasing a …