Recycling directories and backup performance. Was: Re: rsync --link-dest won't link even if existing file is out of date (fwd)

[Ken Chase]

How do you handle snapshotting? or do you leave that to the block/fs virtualization
layer?

/kc


On Fri, Apr 17, 2015 at 01:35:27PM +1200, Henri Shustak said:
  >> Our backup procudures have provision for looking back at previous directories, but there is not much to be gained with recycled directories.  Without recycling, and after a failure, the latest available backup may not have much in it.
  >
  >Just wanted to point out that LBackup has a number of checks in place to detect failures during a backup. If this happens, then that backup is not labeled as a successful snapshot. 
  >
  >At present, when the next snap shot is started, the previous incomplete snapshot(s) are not used as a link-dest source. As mentioned, this is something I have been looking at for a while. However, there are some edge cases which need to be handled carefully if you use incomplete backups as a link-dest source. I am sure these problems are all contractable, I have simply not spend enough time.
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Ken Chase - ken at heavycomputing.ca skype:kenchase23 +1 416 897 6284 Toronto Canada
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