TEST PURPOSE ONLY
I have created TEST env for Oracle Restart with below config details.
Installed 19c DB (Oracle User)
Configured ASM rpm packages (Root & Grid User)
While running $GH/gridsetup.sh ( Grid User)
From the Installation GUI page we are not able to find the Partition disks (ex: /dev/sd*) from change Discovery path.
$ cd /dev
brw-rw----. 1 root disk 8, 17 Aug 20 2024 sdb1

It Seems some Permission issue from:
$ cd /dev
$ chown -R grid:oinstall sdb1
After changing the Permission:
brw-rw----. 1 grid oinstall 8, 17 Aug 20 08:38 sdb1
sdb 8:16 0 50G 0 disk
└─sdb1 8:17 0 50G 0 part

Similaryly after the configuration if DBCA is not showing ASM DG for file storage then we need to add the ASM DG os group to Oracle user using usermod command.