Hey Rainer, thanks for your answer.  I managed to extend the pool, I simply looked at the volumes that were allocated and created new ones with the same size, pool and type. After that part is done I added the new volumes into the storage group defined for the pool I was extending, this is the tricky part, when adding the volumes to the SG you have to click on the "Set dynamic LUNs" this to configure the host LUN id >16, after having the correct host LUN IDs just click on OK and Add to SG, that's it from the VMax side, at the head simply run a storage rescan and the pool will be extended.  Regards.
Hello community,  I have a NAS pool that has run out of space and needs to be expanded, it's a gateway model connected to a VMax, I'm no VMax savvy so not sure what guidelines to follow to add new volumes to the VG50, I have added VMax volumes to servers using GUI but not to the NAS head. Any advice is much appreciated.   Thanks in advanced.
How to add VMax storage to VNX VG50?