I have just bought a Drobo and mounted it with 4 x 1.5 TB. According to Drobo Dashboard, this gives me a total of 4.07 TB available for data.
When asked about sizing the volumes, I selected 4 TB (I made a try with 16 TB, but this was not worth the very long “Drobo boot up time”). This created two volumes of 4 TB each, we can call them “Drobo 1” and “Drobo 2”.
I assume these are two “logical” 4 TB volumes, sharing the same physical 4.07 TB available for data. When the total amount of data of these volumes is 90% of 4.07 TB I expect the Drobo to signal a red light and the Drobo Dashboard to give me a warning.
However, I actually wanted to make the whole Drobo encrypted with Truecrypt. Therefore I deleted the newly created partition on “Drobo 1” and encrypted the entire “device” (not the partition). Save the somewhat bad performance, the encrypted device seem to work as it should.
However, Drobo Dashboard is now only reporting the size of the “Drobo 2” volume, which it states has 3.99 TB free. I also don’t get any “blue lights” on the Drobo unit - although I’ve filled up the Truecrypt volume with about 1 TB. Therefore I wonder:
- What happens when I’ve filled the Truecrypt volume (previously called “Drobo 1”) with 4 TB? Will Drobo recognize this and ask me to put in larger HD’s?
- What happens when I’ve got 4 TB on the Truecrypt volume and start writing data on the un-encrypted Drobo 2 volume? Will Drobo think that Drobo 2 owns all the physical 4.06 TB, although it’s actually encrypted with Truecrypt, and owerwrite the data on the Truecrypt volume?