Cache Drive reached 100% never moves data to array.

[LivingOffgridInAZ]

I have a 256GB nvme cache drive that reaches 100% and never moves the data to the array. What are the common reasons for this? steps to troubleshoot? cheers. 

 

 

[AndrewZ]

Can you post your diagnostics and indicate what the shares involved are.

 

The most common problem would be a misunderstanding of how the use cache setting works for the shares. 

 

[LivingOffgridInAZ]

srp-unraid-01-diagnostics-20220510-1035.zip

[LivingOffgridInAZ]

We have a windows VM running acronis to backup other servers and workstations.  should we not use a cache drive for this purpose? The VM has a 60TB volume for storing data. The VM is unresponsive due to the cache drive reaching 100% and not moving the data to the array.  As you've stated, I suspect this is just a misunderstanding of cache drives and the settings. 

[JonathanM]

1 minute ago, LivingOffgridInAZ said:

As you've stated, I suspect this is just a misunderstanding of cache drives and the settings. 

Read the cache : prefer section of the help, see if that explains things better. If it doesn't, please ask for clarification.

[itimpi]

The only share you have set to move files to the array automatically is the ‘isos’ one (use Cache=Yes) and it already has all of its files on the array.  All the others are set to Use Cache=Prefer which indicates you want those files kept on the cache pool if at all possible.

 

You have also not set a Minimum Free Space value for the pool, so that when the free space falls below this value Unraid starts writing new files for shares with either a Yes or Prefer for Use Cache setting directly to the array bypassing the cache pool.   Not having that set allowed the cache pool to completely fill up.