Hi,
You'll need to format the disk/recreate raids etc, but don't know which platform/software version your using.
Check this link :
https://www.cisco.com/c/en/us/td/docs/app_ntwk_services/waas/waas/v551/reference/cmdr/execmds.html#pgfId-1045306
Or maybe better : use the Rescue CD-rom/Image and boot on that - there is several options to fix this.
Best Regards
Finn