Disks spilling at 50%

[TheBenga]

Hi all,
 

Got a curio on a new ur server, suspect is designed (and documented) behavior but want to understand.
 

Got 5*4TB disks with one as parity. Several shares, all configured with 'all disks', 50GB min free space & 'no cache'.

 

I'm now about half way through moving ~9TB into the the array and have noticed that ur is spilling at exactly 50%. I.e. Im at 5TB moved and disk1 & disk2 are both at 2TB used / 2TB free. Disk3 is at about 1.5TB used and I'm fully expecting the incoming data to start spilling to disk4 once disk3 reaches 2TB.

 

Can anyone point me at documentation today explains this?

 

Ps my expectation is that the data management algorithm is doing this on purpose to spread the data around a bit too mitigate risk of loss through drive failure. As such, I think once disk4 reaches 2TB it'll go back to putting data on disk1. Pure conjure of course!

[JorgeB]

https://wiki.unraid.net/Un-Official_UnRAID_Manual#High_Water

[TheBenga]

Thanks, perfect!