Hello. I have 2 drives in array.

• Disk 1: 3 TB, 2.48 TB used, 522 GB free
  
• Disk 2: 3 TB, 2.25 TB used, 749 GB free
  

I have Share "movies":

• Allocation method: High-water
  
• Minimum free space: 0KB
  
• Split level: Automatically split any directory as required
  
• Included disk(s): Disk 1, Disk 2
  
• Excluded disk(s): None
  
• Use cache disk: No
  

For couple of days I have problem, that when I add file to share "movies" it is added to Disk 1 and not to Disk 2 that has more free space.

I tried rebooting unRAID server and it did not solve the problem.

Only thing that has been changed is that I had changed one of Unassigned Devices.

unRAID version: 6.1.3

Any ideas what could be wrong?

"High water" is not the same as "most free"

 

High Water works like this:  (assuming a pair of 3tb drives)

 

disk 1 is filled until it has 1.5tb remaining, then disk 2 is filled to 1.5tb

disk 1 then filled until is has 750gb remaining, then disk 2 filled to 750gb

 

and so on

 

so in your case, after disk 2 hit 750gb, unRaid will fill disk 1 until it hits 375gb

 

If you want to fill onto the disk with the most free space, select "most free"

 

 

http://lime-technology.com/wiki/index.php/UnRAID_Manual_6#User_Shares_2

As Squid noted, UnRAID is working perfectly -- doing exactly what you've told it to do with the "high water" setting.

 

I assume it's obvious from the values he showed you for the 3TB drive, but just to be clear, high water means it will fill 1/2 of the drive; then fill 1/2 of the next drive, then 1/2 of the next, etc. ...until all drives in the share are 1/2 full.    Then it will fill 1/2 of what's left of each drive (in order); and repeat this process as long as there's space remaining.

 

If that's not your intent, you should change your allocation method to what you want.

 

As Squid noted, UnRAID is working perfectly -- doing exactly what you've told it to do with the "high water" setting.

 

I assume it's obvious from the values he showed you for the 3TB drive, but just to be clear, high water means it will fill 1/2 of the drive; then fill 1/2 of the next drive, then 1/2 of the next, etc. ...until all drives in the share are 1/2 full.    Then it will fill 1/2 of what's left of each drive (in order); and repeat this process as long as there's space remaining.

 

If that's not your intent, you should change your allocation method to what you want.

Not that it's relevant in the op's situation but to elaborate further on Gary's explanation the highwater mark is calculated based on the largest drive.

 

For an array that has two data drives: 4tb and 3tb:

 

Disk 1 (4tb) is filled to the 2tb mark then disk 2 is filled to the 2tb mark.

 

Then,

 

Disk 1 is filled to the 1tb mark then disk 2 filled to 1tb.

 

And so on...

Thanks for explanation.