Hello again.
I did a fresh install of OMV4 on a clead disk. Done all updates and install only OMV-Extras and LVM Manager. After that i connect my "old" RAID5 (4 WD 3TB disks) to the machine and start.
All drives are recognized, also the RAID Array. All logical volumes on tat Array created under OMV3 are visible and it is possible to get the old data when i create a share.
But it is NOT possible to resize any of the Logical volumes. My Physical RAID5 Shows 8.19 TB and 3.78 are used on several "old" Logical Volumes.
Someone with some needfull tips.
nice sunday
Tom