![]() because there is not enough capacity to protect data in this space from a single-drive failure". If they're not, the result is "unusable space. Drobo likes its drives to be of a similar capacity. The "reserved for expansion" space is effectively dead. But your OS will still show an available capacity of 2TB minus whatever you've put on the Drobo. Tot that lot up and you'll get the 456.4GB of formatted storage capacity provided by the three drives. With the 80GB, 160GB and 250GB drives in and ready, we got an actual storage capacity of 219.3GB, with 8.36GB reserved "for expansion", 151.2GB used to store the information Drobo uses to reconstruct your files if a drive fails, and 2.2GB of other "overhead" data. Or are you? No, because the Drobo ensures there's room for the data if the largest drive fails. The auto-configuration of a new drive is reasonably fast.Īnd clearly, if your remaining disk space is less than that needed to hold all your data, you're in trouble. But you can slot in a fresh disk in due course, and reconfiguration will take the new drive's capacity into account. However, you're data's not protected until the process is complete. The adjustment process does take some time, so it's just as well that you can continue to use Drobo in the meantime. And we were able to trigger a Mac OS X 10.5 Time Machine back-up update while the Drobo was busy adjusting itself to the loss of those 80 gigabytes. We were playing an H.264 video file when we yanked the 80GB drive, but playback continued uninterrupted. Taking out old drives and/or adding new ones can be done while Drobo's running, and your data remains fully available to you. Likewise, if you pull out a unit - as we did to simulate a drive failure - it instantly reconfigures itself accordingly, re-alloting the available space for data and for the codes it uses to recreate data that would otherwise be lost when a drive fails. Visit Software Updates to download the latest version of Drobo Dashboard and view the release notes.Add a third drive - in our case, a 160GB unit - and Drobo immediately updates its internal map of the data you've stored on the system. Mac OS X Server 10.6.8 or later (Intel Only).Mac OS X Server 10.5.8 or later (Intel Only).Mac OS X 10.8.x Mountain Lion (Intel Only). ![]()
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