lpar01> mount /emre
mount: 0506-324 Cannot mount /dev/emre_lv on /emre: There is a request to a device or address that does not exist.
Firstly you have to look vg.
lpar01> lspv
hdisk0 00f62a6c98758859 rootvg active
hdisk1 00f62a6ca2279d3e swap active
hdisk2 00f62a6cdf8874f5 emrevg
hdisk3 00f62a6cdf8875ff emrevg
Then
lpar01> varyonvg emre_vg
lpar01> mount /emre