The root_* and d3-d6 you cannot delete from the VG8 side – it would destroy the system config  root_fs_vdm_cifs_se and d13 you can delete  check if you still have a VDM configured
We are decommissioning storage on VG8 and reclaiming disks back to VMAX. Removed all exports, File systems and reclaimed associate VMAX disks. There are still some root file systems and disks are in "in use" state.  [root[NAME] nasadmin]# nas_fs -list id      inuse type acl   volume    name                server 1         n    1   0     10        root_fs_1 2         y    1   0     40        root_fs_common      2,1 3         n    5   0     73        root_fs_ufslog 4         n    5   0     76        root_panic_reserve 5         n    5   0     93        root_fs_d3 6         n    5   0     94        root_fs_d4 7         n    5   0     95        root_fs_d5 8         n    5   0     96        root_fs_d6 9         y    1   0     12        root_fs_2           1 10        y    1   0     14        root_fs_3           2 13        y    1   0     112       root_fs_vdm_cifs_se 1  [root[NAME] nasadmin]# nas_disk -list id   inuse  sizeMB    storageID-devID   type  name          servers 1     y      11619  xxxxxxxxxx-00C3   STD   root_disk     1,2 2     y      11619  xxxxxxxxxx-00C4   STD   root_ldisk    1,2 3     y       2077  xxxxxxxxxxx-00C5   STD   d3            1,2 4     y       2077  xxxxxxxxxxxx-00C6   STD   d4            1,2 5     y       2077  xxxxxxxxxxxx-00C7   STD   d5            1,2 6     y      65542  xxxxxxxxxxxxx-00C8   STD   d6            1,2 13    y     246251  xxxxxxxxxxxxx-0572   ATA   d13           1,2  Can some one please suggest to delete, so that we can reclaim remaining VMAX disks.  Appreciate your help
Storage decommission on VG8