I have a 3ware 9650SE-2LP card that was set up to mirror two 1 TB disks (let's call them Disk A and Disk B). A couple of months or so ago the array stopped working (gave me an error at boot-up saying that there was something wrong -- unfortunately, I didn't write down exact error message). Curious, I took the 3ware card out, unplugged Disk A from it and plugged it directly into the SATA port on my computer's motherboard and it worked fine. Since I had a project that I needed to get out, I used Disk A (without mirroring) just plugged directly into my motherboard. I figured that Disk B died on me...
Fast forward to yesterday. Project being (mostly) done, I decided to investigate the non-working mirror. I unplugged Disk A from the motherboard and plugged in Disk B to make an astonishing discovery that Disk B works! It has the state from when I unplugged the 3ware card a couple of months ago. The problem was the SATA cable that was attached to Disk B (first time I've had a cable fail on me!).
I've replaced the cable. Now I would like to bring the mirror back. Is there any way to do it without destroying what is on Disk A? Basically, is there a way to have the card replicate Disk A on Disk B bit-by-bit and rebuild the mirror that way? I couldn't immediately find such option in the 3ware BIOS utility. Basically, it just gives me the option to select the two drives, and create a unit (it doesn't seem to remember that I used to have these two drives in a mirror before). While I could back up the Disk A and rebuild this mirror by wiping both disks, I would like to avoid that if I can (I have back up of the most important stuff, but I don't have a spare 1 TB disk that I could use to dump all the stuff on Drive A to).
I apologize if this question is dumb, I am kind of new to this and thought that this would be an appropriate community to ask as I saw multiple discussion on the 3ware cards here.