Storage Spaces: SSD tier size incorrect when using EnclosureAware option in a pool

Hi folks,
We're about to deploy Storage Spaces in our test environment, but we encountered an issue while configuring Enclosure Awareness on Storage Pools.
When we create a Storage Pool (over 3 JBOD's) and set the option EnclosureAwarenessDefault to $True, the SSD tier size automatically decreases / shrinks to 12GB (sometimes 18GB sometimes 0GB).
Without EnclosureAwarenessDefault, we get 1110 GB of SSD size available.
The same behavior is seen when enabling -EnclosureAwareness on Storage Space (virtual disk) level.
A summary of our configuration:
3 SOFS connected twice to each JBOD (LSI 9207-8e - SES 3 ) = HCL certified
3 JBOD arrays (Quanta M4600H) (Firmware Management SCSI Enclosure Service (SES-2) = HCL certified
Each JBOD array has 16 HDD and 4 SSD.
SOFS are fully patched, including KB 2913766
Below 2 screenshots:
EnclosureAwareDefault = $True
https://onedrive.live.com/redir?resid=BB5A32452CA3BD6C%21436
EnclosureAwareDefault = $False
https://onedrive.live.com/redir?resid=BB5A32452CA3BD6C%21437

Hi Partner,
Thank you for your detailed information and sorry for the delayed response.
After consulting with some senior engineers, please check the following:
Server manager does not let you set the column count of the space, which means that it is automatically selecting 6 as the column count, as there are 12 SSDs. Unfortunately, the column count must be less than the number of disks of each type in each
enclosure (limited by 4 SSDs), otherwise space creation will fail, and estimation will produce a small, somewhat random number. If you create a space through powershell and specify –NumberOfColumns 4 then it should work.
Hopefully it helps.
Feel free to let me know if you have any question. Thank your for your time.
Best Regards,
Sophia Sun
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Storage Spaces: SSD tier size incorrect when using EnclosureAware option in a pool

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