How to increase space on Citrix ADC VPX instance?

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Instructions

The default disk space (20G) for VPX can't be increased directly.
From Citrix ADC release 13.1 build 21.x onwards, you have the option to increase disk space on the Citrix ADC VPX instance by adding a second disk(unformatted), and VPX will format/mount it when rebooted. 
Please refer to below link for more details:
FAQs | Citrix ADC 13.1