Hi,  TDATs stand for Data Devices. These are the "hypers/splits" that are created on the physical drives in the BIN file with the data_device attribute. These data devices are then put into a Thin Pool and are used as the backing physical devices for all TDEVs bound to that Thin Pool.  The Data Devices (TDATs) are created with the desired RAID protection and the physical spindles that comprise the Data Devices are grouped into disk groups in the BIN. If you have 16 physical spindles in a disk group and you create Data Devices on them with RAID6+2 and then allocate all of those Data Devices to the same Thin Pool, your pool will be comprised of (2) RAID6+2 raid groups at the physical layer.  Here is a visual representation that might help (a little old from my collection but might help show some of it):  [IMAGE]
Can anyone explain what the relationship betwean a TDAT and a physical drive is? My understanding is that a physical drive allocated to a thin pool is split into several Tdats.  also how is the raid spread amongst same drive types in a pool? If I have allocated the recommended 8 drives to a existing 6+2 RG in a thin pool do these drives stay as their own small group of 8 drives I.e less of a spindle spread.  TIA
TDAT HYPERS