HT3275 Time Machine full - compatibility with external mirrored drive???

A friend of mine is using a 2TB mirrored drive (so 999GB capacity available for back-up).  He is getting messages saying time machine cannot back up as drive is full.  As Time Machine is meant to delete older back-ups as and when space is needed obviously drive should not become full.
Apologies if I am writing complete rubbish - as this area is a little over my head . . . but I was wondering if it is possible that the mirrored aspect of the drive is not backing up in the same way Time Machine does (i.e. not deleting older back-ups / have a different archiving method) and is possibly becoming full when the main back-up is not.
Thanks

To OSX (and Time Machine), a hardware RAID set is just a drive, like any other -- it has no idea there are 2 (or more) physical drives in the box.  The mirroring is done by the hardware in the RAID box. 
You need to have your friend look at #C4 in Time Machine - Troubleshooting, and see which message he's getting, as there are some differences depending on the situation and what version of OSX he's running.
If that doesn't clear it up, have him use the widget in #A1 of Time Machine - Troubleshooting to display the backup messages from his logs.  Locate the backup in question, then copy and post all the messages here.

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