After attaching a ISCSI target to ESXi 4.1 U1, we saw that ESXi created a 740,25 GB partition onto the LUN, even though the device has 2,7 TB capacity. Why did ESXi not create a bigger vmfs partition? How to fix it?
The "Why?" part:
According to http://www.delltechcenter.com/page/3TB+drives%3A+OS+Behavior+Matrix, the maximum LUN size for VMFS is 2TB.
According to http://www.delltechcenter.com/page/3TB+drives%3A+OS+Behavior+Matrix what ESX will do if the LUN size is bigger is it makes a 740GB partition and the rest is inaccessible.
The "How to fix it" part:
Present a smaller than 2TB LUN to ESX. That can be done by creating partitions on the disk (/dev/sdb1 /dev/sdb2) and exporting those partitions as separate LUNs to ESX.
Max size LUN in ESXi is 2TB -512 Bytes. The LUN can be no bigger. The information can be found in the VMware configurations maximums document.