While you trying to vary on a volume group or mount some filesystem to consist of this error code:

0516-082 varyonvg: Unable to access a special device file.
Execute redefinevg and synclvodm to build correct environment.

mount: 0506-324 Cannot mount /dev/oradata_lv on /oradata: There is a request to a device or address that does not exist.

make the following steps:

redefinevg -d hdisk2 vgname
synclvodm -v vgname

varyonvg vgname

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