Hello,

I use Unraid 7.01. with a single SSD, working as BTRFS Cache drive. There is no array defined, as I use this Unraid installation for Docker and VMs only.

 

Overall:
    Device size:		   1.75TiB
    Device allocated:		   1.30TiB
    Device unallocated:		 458.43GiB
    Device missing:		     0.00B
    Device slack:		     0.00B
    Used:			   1.29TiB
    Free (estimated):		 465.52GiB	(min: 236.30GiB)
    Free (statfs, df):		 465.52GiB
    Data ratio:			      1.00
    Metadata ratio:		      2.00
    Global reserve:		 512.00MiB	(used: 0.00B)
    Multiple profiles:		        no

             Data    Metadata System                             
Id Path      single  DUP      DUP       Unallocated Total   Slack
-- --------- ------- -------- --------- ----------- ------- -----
 1 /dev/sdb1 1.29TiB  6.00GiB  64.00MiB   458.43GiB 1.75TiB     -
-- --------- ------- -------- --------- ----------- ------- -----
   Total     1.29TiB  3.00GiB  32.00MiB   458.43GiB 1.75TiB 0.00B
   Used      1.29TiB  1.79GiB 176.00KiB                          

 

This is my current data about this SSD.

 

Right now my applications stopped to work, as there is "no space left on device".

That is reproducable if try to create a file under "/mnt/user/Media" for example. But if i try to create something under "/mnt/cache/Media", everything works fine.

Is there a kind of maximum limit which is set by the underyling FUSE system or anything else in /mnt/user/<share>?
I now use /mnt/cache... for my pathes, but this is only a workaround for me.

Edited March 26, 20251 yr by Twix

Check this setting:

 

It should larger than the largest file, you expect to wrote to this disk.  (If you had secondary storage assigned, Unraid would would bypass the cache drive and write the file directly to that disk.)

 

Sometimes the default setting for this variable is unreasonably large...

Thanks! There was 488GB entered!

This is ca 25% of my disk. This should solve the issue!