Drobo Update - My experience of a failed disk drive

Back in November 2009, thats 3 years ago, I did a post about Drobo. What made this interesting was that it included a video of my then 12 year old son doing the unboxing and deployment of the device.

Well 3 years later a lot has changed. My son Tim is more of a geek than I am and a heck of a lot taller, and the range of Drobo hardware has changed. However the Drobo box has been faithfully running those last three years without incident. That is until last week when it suffered a drive failure.

When I originally installed the Drobo I put in 3 x 1TB drives. Then after about two years, as usage started to increase, I picked up another 2TB drive to insert into the remaining slot. No config required, just inserted the drive and let it do its thing. Thats the benefit of BeyondRAID.

Last week at work I get a text from Tim.

The drobo lights are flashing green then red, its got about 480g free. I dont have the drobo dashboard but if you tel me which drobo it is I can get it and see what it says.

Of course I remember, unlike Tim, that there is the indicator light cheat sheet on the back of the front cover. I ring Tim and he reads out what the lights mean.

The chart reveals the problem, the new 2TB drive has failed and a rebuild is occurring on the remaining 3 drives. Thats good. We have not lost any data, the unit is still operating, we can read and write data. The only change is that the available free space on the unit has reduced, as indicated by the blue lights on the front.

After quite a few hours, Tim and I start to get impatient about the rebuild time. I of course am expecting the rebuild to take a while, I know that even in big enterprise storage arrays this can take a while and that the older Gen2 Drobo that we have is does not have much grunt in its processing power.

To try and determine the time I browse a few sites on the Internet to read what others have experienced. It was a little disturbing to read so many horror stories about peoples rebuild times, sometimes its weeks and other stories of their units failing. Sounded a little ominous so we installed the Drobo Dashboard onto the Mac Mini it was now connected to in order to determine the rebuild time.

The estimate for the rebuild was another 30 or so hours and it had probably been running around 12 hours already. We went to bed thinking we had a long wait ahead. In the end the rebuild finished ahead of schedule and probably took around the 24 hour mark. For the age of the device and the fact that we lost the largest drive in a box and that was reasonably utilised, I think that is a reasonable time.

Turned out that the drive that failed was still under warranty (thank you serial numbers) but we figured we might as well go and get another 2TB drive and get back some free space, when the RMA arrives we can swap out one of the smaller drives with the larger one and get some new space.

After a fun trip to a computer store we slotted in the new drive. The crazy thing was that within under a minute the indicator lights started flashing again and one of the original 1TB drives was showing red, another failed drive. I have no idea if it was good or bad luck! But the drive was certainly failed. The rebuild was much faster this time.

A day or so later we found a spare 1TB hard drive in the study and threw it in the slot of the failed drive. All great. We are now back to where we were, plenty of space and redundancy. Here is the current state.

Now once that 2TB drive returns from the RMA we will still swap out one of the original drives.

So whats my thoughts on the Drobo after 3 years and experiencing a real life drive failure?

• Everything works as advertised.
• The setup was easy, we experienced that 3 years ago.
• When a drive failed it was great that everything continued to operate as normal, we could still read and write data as we wanted.
• It was great that it did not matter if we had the Drobo Dashboard software up to date or even installed, the unit took care of everything itself.
• The rebuild after a failure did take time, but in our experience that time was reasonable and as it did not really on the computer, and that we could still utilise the device, the only thing inconvenienced was our patience.
• Even thought the unit is starting to age, the software and firmware updates are still available.
• Never trust a single device. All of data that is critical such as family photos, but also general data we would be inconvenient to loose is also backed up to the Cloud using CrashPlan. I don't care how highly available a storage unit is, it is not backup if its your primary copy! That is one concept I think a few of those people complaining about their Drobo experiences need to take heed of. 

There is sometime attractive about technology that is so smart it can make things so simple to use.

Rodos