LSI MegaRaid - Image Drive from Failed RAID

Are you saying that you had three SAS disks in a RAID 0 arrangement? That means that there was no redundancy.

Do you what specifically about the power failure impacted your environment?

Was there just a power outage? A power surge? Electrical storm? Lightning?

I'm not certain that a power outage would result in an array failure... However a failed disk COULD result in array failure.

When you look at the SAS controller's status, what does it say? Please post the details in your question. Regardless, you did have a RAID 0 configuration, so a failed disk means your data is likely unrecoverable. Remember, RAID 0 strips the data across the member disks. So recovery would be challenging.

Do you want to image the disks knowing this information?

As for mounting the disks, this may not be possible without specialized tools. Those drives have array metadata, and at this point, the array has failed. Again, details will help, but you wouldn't be able to just mount one of the disks.

Also, you're right... USB->SAS adapters do not exist.

RAID0 is not the proper configuration for mirroring individual drives. What you need is a SAS controller without RAID functionality. On some (most?) controllers you can disable the RAID functionality by choosing to use JBOD. If your controller has such a setting, I would expect it to be useful for imaging your disks.

If your current controller cannot do it, you may need a new one. Obviously it need to be SAS on the drive side, on the host side it could be anything your host supports. I'd be surprised if there did not exist a SAS enclosure with a USB connector. But it might be a lot easier to find a SAS controller using PCI or similar.