These sound similar to the questions/concerns I raised a while back.
1) Does the daemon read/write the entire drive to look for dead blocks to clean?
Yes - sequentially (and then it rolls over to the beginning again).
2) What if there aren't any dead blocks to clean and the free space in the drive is still less than 10% (the default min_clean_segments in the conf file), does the daemon still process the drive? If so, how do I change the cleaning interval so that it doesn't process the drive as often?
The only worthwhile suggestion I heard is to set the minimum history retention rate (the FS is continuously snapshotting) to 1 day. That way you can guarantee the churn rate will never exceed the capacity of the disk per day. Not ideal, but at least it puts some kind of a hard limit on how quickly it'll waste your flash - at the expense of making the problem of the non-determinism of free space a little worse.
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