I'm trying to back up a photos library that's 250gb in size. I have a time machine share that uses disks 1-3. Disks 1 and 2 are nearly full - about 100gb free in each. The share is fill-up. The issue is when I try to copy this file it says there's not enough disk space. What can I do about this?

Go the the settings page for the share, and turn on help. It will explain the various settings which can affect this, Allocation Method, Split Level, Minimum Free.

 

Also, note that Minimum Free only affects whether or not unRAID can choose to begin writing to a disk. It has no way to know how large a write will be. If a disk has less than Minimum Free, it will choose another disk when it begins to write a file.

 

 

Could unraid split a file among 3 drives? Because this is a large file it's relatively uncommon to run into this issue. I think I have 50mb free requirement.

1 hour ago, Pandemic said:

Could unraid split a file among 3 drives? Because this is a large file it's relatively uncommon to run into this issue. I think I have 50mb free requirement.

No.   UnRAID will never split a file across drives.   The way unRAID works means each disk is a self-contained file system, so if necessary any disk can be removed from unRAID and read on another system.

Minimum Free should be set to be larger than the largest file you ever expect to write. If a disk has less than Minimum Free when it begins to write a file, unRAID will choose another disk for the write.

 

If you have Minimum Free set to 50MB, and a disk has 51MB free, then unRAID can choose that disk even if the file you are writing is 100MB. It has no way to know in advance how large a write will become.

 

If instead you have Minimum Free set to 100MB, and the disk only has 99MB free, then unRAID will not choose that disk for writing any file.

YEah, I've increased it to 300gb in hopes I can reliably back up these files. Thanks for the help!