The trouble with discard

The trouble with discard

Posted Aug 19, 2009 17:06 UTC (Wed) by foom (subscriber, #14868)
In reply to: The trouble with discard by ikm
Parent article: The trouble with discard

If the disk is 100% full, and you continuously overwrite a single block, it can decide to move a non- changing block into that location so as to stop its write-count from going up, and remap the changing-frequently block into the previously unchanging location.

This, of course, requires using extra write bandwidth, but it can allow the entire disk to be evenly written, even when 100% full. The changing block will get mapped into each location on the disk in turn.

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