You need to be specific. “Drive Errors” could mean a lot of things (drive failure, zfs corruption, etc). Exactly what are the error messages?
Take a look in my signature for Drive Troubleshooting Flowcharts. This will help you identify what kind of problem you have. If it does not solve your issue, at least you can tell us what is going on.
Using the flowcharts will allow you to troubleshoot this problem faster vice messages here in the forums.
Cheers