You already have 3 drives at location 1.2, 1.17 and 1.18. Out of them you need to just replace 1.2 as that one failed.
Then you need another 11 drives of 600 Gb each. so that you can create Virtual Disk Group 7 x 600 GB =4200 Gb drives in each Pool.
Otherwise you can take data backup, then delete all data and existing disk-groups. Then re-create VDG and volumes. After that you can convert them as Thick Volume means overcommit option you can disable by modifying Pools settings.
Hope this helps!
Regards
Subhajit
I am an HPE employee
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