Try to reboot your system (while keeping the Drobo connected and powered on).
Check after the reboot if the time estimate in Drobo Dashboard remains the same.
When I did the same as you (4x1GT -> 3x1TB + 1x2TB) on my Drobo 2G, it took a little less than 3 days, so you seem to already be above average.
But if you have regular I/O activity on your Drobo at the same time as it rebuilds, then the lengthening is normal.
And remember you will have to endure this a second time, since you need 2x2TB to get any usable size increase…
And yes, this fine point is not really advertised in DRI marketing brochures…
Restarted computer, it has now settled at around 33 hours (with a few jumps up to around 160/190). Sometimes I can hear some I/O activity but for the most part I cannot hear very much, a few clicks every 10 seconds or so. I’m not accessing any data (unless the computer is doing something every so often). The drives don’t appear to have spun down though.
How can I know if it’s actually doing what it’s supposed to? Does the timer only actually move if the Drobo is doing things or is it just a software trick? How often is Drobo Dashboard polling the Drobo for an update?
Thanks for your help.[hr]
Had to restart the computer again anyway, now at 141 hours, the progress meter has reset.
I really hope it’s just very inaccurate at guessing the time needed and the Drobo is actually doing what it said it’s been this last while.
it should take less than 48 hours, probably closer to 36
ANYTHING accessing the drive (be it windows search/google desktop search/OS X finder) will DRAMATICALLY slow it down.
if you dont need to use your drobo… the fastest way to do it would be
turn off your computer
unplug the USB cable (drobo will stay on and will continue to rebuild)
restart and use your computer as normal (without drobo attached)
that way nothing will be accessing drobo and slowing it down and it will rebuild at the fastest rate possible. As soon as drobo has finished rebuilding it will go into standby (thats how you know its finished)