The slices for the LUNs are not created until you bind a LUN in the Pool. In release 31the slices are not pre-allocated for either a Thin LUN or a Thick LUN. For Thick LUNs the capacity of the LUN will be subtracted from the available capacity, but the actual LBA's are not assigned until you start to write or if you format the LUN.  When you first create a Pool, it takes all the disks you allocate to the Pool and divides them into small raid groups (hidden). It then creates a number of LUNs on these hidden raid groups (also hidden). This is the initialization stage, before you start to create your user LUNs. This is the same process that runs when you create a new raid group. This does take some time and there are messages in the logs that indicate that the initialization is started and when it completes. The time to complete this stage varies based on what else is going on on the array.  glen
Hello all,   I have a question regarding pool creation.  When I create a pool, lets say a RAID 1/0 pool (but happens on all types) and I add the first 8 disks, it creates the pool and then I assume, laying out the 1GB slices.  Then I take the second set of 8 disks, and add them, and so on.  What i have noticed is while this is going on, performance suffers in this pool, as I would expect.  My question is, is there a way to know a percentage completed or a time remaining for how long the File System creation will take.  On larger pools, ive had to let it run over the weekend before testing with IOMeter.  If not, this should be introduced as a new feature in Unisphere.  Thanks, Mike
CLARiiON / VNX Pool Creation