1. Here once I have moved all thin devices to other pool, shall I delete all the tdats use to form that FC pool from DISK GROUP B? No need for draining. Right? To move the TDEVs (from the FC thin pool, formed using disk group B) to the other thin pool formed from disk group C, use a #symmigrate. Merely doing a rebind will cause extents currently sitting on the original thin pool to stay where they are & only new writes to the TDEVs will move over to the target thin pool. The TDATs can be deleted.  2. Once TDATS are deleted, I will use bin file change to move 16 FC disks from DISK GROUP B to DISK GROUP A. Yes, a bin-file change will help you move the 16 FC disks from disk group B to disk group A.  3. Currently DISK GROUP A has already 16 FC disks in it and thin pool exists with 2- WAY Mir config, so what will be the procedure to add these 16 disks? Can it be done on the fly and create TDATS from the newly added 16 disks and how to expand the existing thin pool? After the 16 disks are added to disk group A, EMC is going to create the 2-way mirror TDATs (data devices) and will give you the device serial numbers (or you may create them using a #symconfigure), after which you may use a #symconfigure to add those TDATs to the thin pool. Enable the TDATs and perform a rebalancing and you're good to go. You can create your TDEVs now.  To create TDATs from the 16 newly added drives on disk group A, A symconfigure command will do the job. (symconfigure -cmd "create dev count=X, attribute=datadev, config=.. )  At the end it will give you the IDs of the new TDATs created, something like a ..  . . Local:  COMMIT............................................Done.       New symdevs: 5ECB:5ECF [DATA devices]     Terminating the configuration change session..............Done.  add them to the pool : symconfigure -sid XXX -nop -cmd "add dev  5ECB:5ECF to pool type=thin ; " commit  then enable them and start a rebalance on the thin pool : symconfigure -sid XXX -nop -cmd "enable dev 5ECB:5ECF in pool type= thin ; " commit symconfigure -sid XXX -nop -cmd "start balancing on pool ; " commit  Now create your new TDEVs (using the space added from the TDATs you just added to the thin pool) using a symconfigure ..  regards ..
Hi,   In our environment we have planned to modify couple of disk groups such as reconfiguring the RAID group from 2-Way Mir to Raid-5 and recoup the extra disks and use it another existing disk group.  Is this going to be bin file change or it can be done through Symcli?  Dino
VMAX Disk Group modification