Just wondering what would happen if there was a power failure during a relayout/rebuild?
best case: nothing happens and relayout continues once power resumes
worst case: your data is screwed and you can no longer mount the volumes
take your pick
Here’s a better question, because it’s what I’m going through right now.
Let’s say there’s a known bad drive in the array that drobo would like you to remove (not dead, but hanging/stalling). Then the drobo initiates a rebuild. Do ALL lights on the front flash green/yellow, or does the failed drive light continue to blink red while all the others flash green/yellow so that you can replace it?
@ idobi - DRI’s official statement is that they always see SOME data corruption if power goes out in a rebuild
in my personal experience - its happened to me twice - chkdsk found and fixed a few minor file system things, but i never found any corrupted files (im sure one or two may have - but i havent noticed anything!)
@rkuo: Only the drives in use will flash green/yellow, meaning the bad drive (red flashing) will remain flashing red.
Thanks … that helps. I was wondering if the Drobo was poorly done in the sense that it would flash everything yellow/green even with a bad drive in there. So the Drobo must be marking my drive bad temporarily and then bringing it back online before rebuilding.
Can you do a safe shutdown through the Dashboard in the event of a power-failure during a relayout, assuming the Drobo is attached to a UPS? Or is there a way to configure this automatically? If not, this seems like a rather glaring oversight.
i think drobo ignores shutdown commands during rebuilds…
but im not about to test it
Can somebody from DRI chime in here? If power failure during a relayout almost certainly corrupts some data, yet the only line of defense against that is a UPS, which wouldn’t last a full relayout, is there a way for the unit to safely shutdown then during relayout? Or are you working on such functionality in the future?
I recently had a power outage while my DroboPro was rebuilding (attached to a UPS). Although it would not shut down from the panel, I pressed the on/off switch on the back of the unit, and it gradually shut down (not an instant shut down). Later I powered the unit back on and the rebuild continued.
That’s encouraging (I should really buy a UPS), but the Dashboard should have some functionality built in such that if it detects the power has been shunted over to a UPS, then it can start a graceful shutdown automatically since it knows the UPS won’t last.
yeah - the pro’s are slightly different due to their hardware power switch
there is no actual reason why you shouldn’t be able to tell it to shutdown during a rebuild - it should just carry on when done
Thats typically a bad practice Sunny, in the case of a re-layout you would NOT want to interupt that process unless absolutely neccesary.
Since you have it connected to a UPS, you would have been better to just let it run.
You ended up ok, with the re-layout resuming, but I personally would not want to chance my data.
Just a best practice.
Rmeyer, seems to me his point was that since the Drobo is not UPS aware and cannot be told to shut down during a relay, Sunny just speeded up the inevitable although I would certainly have waited to see if God intervened in the interim and restored power
(He did the wrong thing but DRI is more guilty of poor design, especially if they suggest that power downs during relays generally end badly, as Docchris suggests in reply #4).