If you are using MSA1040 as linear array which means you are dealing with Virtual Disk or Vdisk. I understand you have completed Vdisk expansion with new single drive. If not done then you need to do it first.
After that you need to go for Volume Expansion.
Please find the SMU guide to get the steps,
https://support.hpe.com/hpsc/doc/public/display?docId=c04220794
Page 225 for Vdisk Expansion and Page 100 for Volume Expansion
If you are dealing with MSA1040 as Virtual Array then Virtual Disk Group (VDG) expansion not possible rather you need to create new VDG with the single drive but single drive VDG not having any data protection. After that you need to add this new VDG to the existing Pool from where you have created Volume earlier which you want to expand.
Hope this helps!
Regards
Subhajit
I am an HPE employee
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