Having a working RAID and data mirroring set up on your server/PC is great for when your one of your hard disks dies, but what to do when this really happens to you? How do you get that data back?

This article shows what to do to retrieve your data back on a FreeBSD system that uses gmirror

I like RAID. On my development server, I use both hardware and software RAID. For hardware RAID on FreeBSD, I like 3Ware. For software RAID, I tend to use gmirror, because I don’t need more than RAID-1.

Some time ago I added two 120GB HDD to this system. One was SATA, one was PATA. They were joined together via gmirror. Tonight I received some errors that one of the drives was failing. I replaced the drive, and recovered the mirror. I’ll show you what I did, mostly so I know what to do the next time it happens, but also so you can see what to do as well.