The connected windows hosts did log a "Disk 4 has reached a logical block provisioning permanent resource exhaustion condition. "

So the Unity apperently reported this on the specific lun.

Anyone a clue how to reduce preallocated space? (Really give back the preallocated space to the pool)

Hello jpveen,

You will need to open a support case and reference Article Number: 000051695 and support can make the changes.

open a SR - support can increase the rate of preallocated space returned to the pool

we did raised a SR with EMC support for the same and here's what they did was modified the tricklewindow parameter from 96 (default value) to 512. 

@Dewey Cox​  how to change ,Do you remember the detailed operation, thank you

Bumping this old post as well, curious.

I went through the Unisphere CLI, not finding anything.  

If you google "dell" or "emc" and "tricklewindow", this is the only place is brings you......

Hello Moeyyy,

Here is a link to a KB that maybe of assistance.

https://dell.to/3JDLH0c

@DELL-Sam L​  That link is not working can you send me the command to run to increase the tricklewindow

Thanks

Hello JoeCapEMC,

Here is the updated link.

https://www.dell.com/support/kbdoc/en-us/000051695/dell-emc-unity-potential-pool-space-issues-due-to-large-levels-of-pre-allocation-for-a-storage-resource-dell-emc-correctable

@DELL-Sam L​ uemcli doesn't have any option of tricklewindow. How is this parameter configures? 

Hi,

Thanks for your question.

It needs to be adjusted by phone support.

Let us know if you have any additional questions.