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This may be tricky to interpret. OFFLINE area is the DRES data that has been stored on tape, after 3 months of storage (see DRES description above). ONLINE area is the DRES data still in FS or ARCH area. The total quota of storage capability assigned to your DRES is indicated in the "aQTA" parameter of the line "OFFLINE". When DRES is empty, the corresponding value of the line "ONLINE" will be the same as "OFFLINE", but when files begin to be moved it will decrease, while the "aUSED" parameter of OFFLINE will increase accordingly. It means that you have less space that you can use to store your data since some of them already used space has been moved to tape. Similarly, deleting offline data will decrease the aUSED parameter in OFFLINE, and increase the aQTA parameter in ONLINE of the same amount. The formula to remember is:
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