Unisphere reports the amount of storage that has been allocated to the storage resource in VNXe. The amount of storage that gets allocated to the resource will always be more than the consumed capacity (which you can check from your host) because we want to keep a buffer capacity to absorb any sudden burst of IO activity from the host application. Extending your storage will take some time and we dont want to keep the host IO in a waiting state while the storage capacity extension is done. Keeping a buffer of some extra capacity helps avoid that situation.  The algorithm that we follow internally is that when you consume 75% of your allocated capacity, we automatically extend your storage resource by either a) 8GB or b) 5% of your current capacity (whichever is larger).  For example, if you have 200GB allocated to your iSCSI volume, and even though you have consumed only 150GB (75% of 200GB), we will allocate another 10GB (= 5% of your allocated capacity) to your storage volume.  I agree that this can be confusing initially. The amount of allocated capacity that you see in Unisphere is what has been allocated to your storage resource internally. What you see from the host file system is the amount of storage that you are actually using up. We are working on creating a primus solution to help explain this.
Hello everyone - first post here.  Let me start my saying we are setting up the VNXe3100 with an iSCSI server to make use of generic iSCSI storage.  I have everything setup correctly (seemingly - I followed the directions - no problems there).  I allocated a 250GB chunk of disk with thin provisioning and proceeded to restore 170GB of data to it from Backup Exec.  We do have the newest OE on there 2.0.2.  Wanted to use Backup Exec so that it restored all of the access rights.  However, my question involves the Unisphere dashboard and consequently other views within Unisphere.  After the 170 GB of data was restored to the iSCSI storage device, I logged in expecting to see a nice pie chart reconfirming my believe that 170GB of data was in fact restored.  I log in to our server (the host for the generic iSCSI storage) see that 170GB of data is taken up with 80GB free.  I log in to Unisphere, and see that 214.777GB used.  I go back, check a couple more tools on the server - all say 170.  Go back to a few different views in Unisphere, they all say ~214 GB used.  I have data protection turned off - but as I understand it, that would just increase the initial allocation of the disk not take away from the 250GB. What is up with this extra  45GB?  BTW...this is about the fourth time I've reset the Unisphere - blew away all the disks - and started over checking to see if I missed a setting.  The first time, I restored about 560 GB of data on a 1.8TB chunk and it ended up taking up (or allocating) 1.5TB.  Thanks for the help! Jason
Migrating data to VNXe3100 - Sizes do not match