If i remember right,  when a new lun is created, it binds it instantly but kicks off a background verify that runs in the background to check each block in the lun.  depending on the size, it can take a while and you will have the flashing disks.  Hopefully someone can verify if im right or wrong:)
Hi All,  need some help here, we have one DAE that has 10 300GB FC disks, we made two raid groups out of them 2x( 4+1 raid5), the first raid group is assigned for vmware, it has 2 LUNs and it only has 2 VMs for now, the other raid group is used for RLP for MV/A.  I’ve noticed that the lights on those 10 disks are just constantly flashing, none stop, I couldn’t figure out why they are busy at all time… we do have other disks and raid groups but none of them behaving like this…what are the areas that I can look in to it to troubleshoot  the cause of this?  Thanks,
busy disks