For those of you that read my blog often, you know that I admin the cluster that our research group uses here at CU Boulder. Because of this, I get a lot of questions from users who don’t want to take the time to solve their own problems. Fairly recently, our RAID-6 crashed (we had a 4th drive die and had to rebuild the array). Normally this wouldn’t be very much of a problem as most of the files saved on our storage drive are just input files that we can re-download from a separate server, or so I thought. Personally, all my source code is in my home folder, backed up on our data server, and backed up onto my personal laptop. For researchers in our group who are developing code, not having a backup of source code can lead to many many months of lost work. Well, as it turns out, many of the people in our group had their source code on our data server (the one that crashed), without a backup anywhere. So months of work had been lost. Well, after the rebuild I have gotten many questions on how to set up an ssh tunnel so that they can backup from our cluster, through the front end, to their home computer.