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I've beeing owning a license for Drivepool for some time now and I'm very satisfied. A few junctions here and there and my new ssd is practically transparent; some folders reside on the ssd, some on the hd and c:\ looks exactly the same as it did before. However I'm having some problem rebalancing. (I think everything was working as expected (by me) at the beginning, but I can't tell for sure.) A few days ago my ssd (c:\ boot windows drive) filled up unexpectedly but I found out the cause: First: I was loading a big chunk of data; second: on the mechanical drive I had forgotten to expand the partition to the full capacity. Therefore Drivepool had to fill up also the ssd drive. No big deal. I expanded the "big" drive partition to its full capacity and told Drivepool to move some big folders to it. I could have done it manually but I was eager to see a big rebalance in action. Nothing happend. Drivepool version is 2.2.2.934 Now a list of thing I tryed (in various order and mixes) and of unexpected things. I added some rules in the file placement checking only the big drive. "Allow files to be placed on other disks if all selected disks are this full" is enabled at 90% I disabled all the balancers. I installed the SSD optimizer, enabled it alone, disabled it. I uncheck "file placement rulse respect real-time file placemente limits set by the balancing plug-ins". I unchecked "unless the drive is beein emptied". I triggered "remeasure". I triggered "rebalance" (it flashes for a moment then ends). I scheduled a one-time rebalance. I disabled automatic balancing. I got a verbose log of a manual re-balance, and here things are a bit weird because the strings that look like timestamps at the beginning of lines are off by a weird number of hours AND minutes in respect to the machine clock (which is quite right by itself). 21:03:58.4: Information: 0 : [Rebalance] Setting Background I/O priority 21:03:58.4: Information: 0 : [FsControl] Set overall pool mode: PoolModeNoMeasure (lastKey=Rebalance, pool=9cbf91d2-40b0-45b5-b326-35429cc490bf) 21:03:58.4: Information: 0 : [Rebalance] Balance states (START): 21:03:58.4: Information: 0 : [Rebalance] 6ce3ec8d-c620-4034-b599-126c09029a9b (ColorfulStone (C:\)): Fill = 626,074,648,576 B / 640,029,118,464 B (97.82%) 21:03:58.4: Information: 0 : [Rebalance] Unprotected: 481,816,012,691 B / 640,029,118,464 B (75.28%), Delta = 0 B, Limit = 1.0 21:03:58.4: Information: 0 : [Rebalance] Protected: 2,405,517,651 B / 640,029,118,464 B (0.38%), Delta = 0 B, Limit = 1.0 21:03:58.4: Information: 0 : [Rebalance] e260dc30-3718-4de5-8d0d-61b59b07298f (GreenishStone (F:\)): Fill = 981,641,318,400 B / 2,000,289,812,480 B (49.07%) 21:03:58.4: Information: 0 : [Rebalance] Unprotected: 962,070,509,969 B / 2,000,289,812,480 B (48.10%), Delta = 0 B, Limit = 1.0 21:03:58.4: Information: 0 : [Rebalance] Protected: 2,405,517,651 B / 2,000,289,812,480 B (0.12%), Delta = 0 B, Limit = 1.0 21:03:58.4: Information: 0 : [Rebalance] Balancing file placement... 21:03:58.9: Warning: 0 : [Rebalance] Error balancing. The system cannot find the path specified 21:03:58.9: Information: 0 : [FsControl] Set overall pool mode: PoolModeNormal (lastKey=Rebalance, pool=9cbf91d2-40b0-45b5-b326-35429cc490bf) 21:03:58.9: Information: 0 : [Rebalance] Calculating optimal slack... 21:03:58.9: Information: 0 : [Rebalance] Largest PoolSize (UIDs: e260dc30-3718-4de5-8d0d-61b59b07298f, Largest=1,983,124,521,700 21:03:58.9: Information: 0 : [Rebalance] Other PoolSize (UIDs: 6ce3ec8d-c620-4034-b599-126c09029a9b, Other=498,175,934,694 21:03:58.9: Information: 0 : [Rebalance] (Largest=1,484,948,587,006) 21:03:58.9: Information: 0 : [Rebalance] Optimal slack: 1,484,948,587,006 B 21:03:58.9: Information: 0 : [Rebalance] Calculating duplication obstruction... 21:03:58.9: Information: 0 : [Rebalance] Calculating current slack... 21:03:58.9: Information: 0 : [Rebalance] Largest FreeSpace (UIDs: e260dc30-3718-4de5-8d0d-61b59b07298f, Largest=1,018,648,494,080 21:03:58.9: Information: 0 : [Rebalance] Other FreeSpace (UIDs: 6ce3ec8d-c620-4034-b599-126c09029a9b, Other=13,954,404,352 21:03:58.9: Information: 0 : [Rebalance] (Largest=1,004,694,089,728) 21:03:58.9: Information: 0 : [Rebalance] Current slack: 1,004,694,089,728 B 21:03:58.9: Information: 0 : [Rebalance] Obstructed: 1,004,694,089,728 B 21:03:58.9: Information: 0 : [Rebalance] Other pooled files: 626,074,714,112 B 21:03:58.9: Information: 0 : [Rebalance] (DuplicationObstructionSlack=1,004,694,089,728 21:03:58.9: Information: 0 : [Rebalance] (DuplicationObstructionSlack / 2=502,347,044,864 21:03:58.9: Information: 0 : [Rebalance] (TotalPoolSize=2,481,300,456,394 21:03:58.9: Information: 0 : [Rebalance] (DuplicationObstructionLimitRatio=0.3) 21:03:58.9: Information: 0 : [Rebalance] (DuplicationObstructionRatio=0.2) 21:03:58.9: Information: 0 : [Rebalance] (TotalPooledFiles=964,476,027,620 21:03:58.9: Information: 0 : [Rebalance] (DuplicationObstructionStateTotalSize=2,000,289,812,480 21:03:58.9: Information: 0 : [Rebalance] (DuplicationObstructionStatePooledFiles=964,476,027,620 21:03:58.9: Information: 0 : [Rebalance] (ToMoveRatio=0.7333) Snapshot taken around 16:20 I solved the immediate problem of full disc by moving some stuff manually. Drivepool didn't complained, just found one duplicate file (I was too lazy to stop the service) and fixed it. Can you advice? What other informations can I give? Thank you!