SC series storage has the ability to create multiple tiered virtual storage containers per system (disk pools) - each pool is evaluated separately from all others. People do this for multiple reasons, they wish to run encrypted and unencrypted disks side by side, different projects or billing, etc. To get the most of the storage efficiency features in an SC you would normally use ONE disk pool and place all of the disk resources in it. That allows you to define policies (or use the defaults) that allow you to have LUNS use different tiers of disk to hold blocks based on age and other criteria (based on storage policy).  When you create a new disk pool and place only one type of disk in it - that has a single tier. As you need different types of disks the tier labeling update automatically to reflect that change.  If you are trying to create space that is archival and all LUNS should be compressed immediately, you should just ensure you are on the latest version of the SC firmware.  For your situation - read through the following document and then based on the information enable as needed.  en.community.dell.com/.../download
So Guys,  We have added a new enclosure to our sc8000 and it has 4tb 7k disks.  We have created a separate folder (called secondary) and they are in a different pool, so dont take part in the normal data progression. The thing I am concerned with is they are classed as T1 disks? I want to leverage compression on SCOS v6.5 but that only works on T3 storage?  Why are they classed as t1?! What am I missing  [IMAGE][IMAGE]  
New Enclosure Added with 4Tb 7k disks but I have a question