error while trying add new domain storage tab

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i have issue when i trying to add new storage (new domain) i got error code like pic below...

my rhel ip 192.168.2.20
my rhev ip 192.168.2.110
my /etc/exports on rhel
/nfsshare 192.168.2.110/24(rw)

please help me

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make new storage for the first time

Unfortunately the image you included is quite small and challenging to read. I'll assume you want to add a Data Domain (and not the ISO Domain).

Did you export the NFS share from your Hypervisor (rhel?) Or is that a separate host?

You need to make sure that the share is owned by vdsm:kvm (36:36) and allows the Hypervisors to mount them directly (via your /etc/exports)

https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Virtualization_for_Servers/2.2/html/Administration_Guide/Add-Storage.html