VMware Host zoning for multi X-Brick EMC XtremIO storage array
VMware vSphere ESXi 5.5 and 6.0 have a limit of 256 LUNs per host:
In an environment where a host with two HBAs (VMware Best Practice) is connected to two fabrics and storage array with two Storage Controllers (EMC VNX, for example) the host will have four paths to a LUN: 2 Controllers x 2 HBAs = 4 paths
When we apply the same approach to EMC XtremIO clusters (two or more X-Bricks, 8 maximum), we should also consider another limit, the ‘Number of total paths on a server‘ which is 1024. With two X-Bricks, you have four controllers, multiply by two HBAs and you have eight paths per LUN. Therefore the max number of LUNs will be 128 LUNs (1024 / 8 = 128).
To learn more and to read the entire article at its source, please refer to the following page, VMware Host zoning for multi X-Brick EMC XtremIO storage array- vStrong.info