Michael's Daemonic Doodles

We have a couple of cheap servers using a single 1 TB drive connected to the on-board Intel SATA controller and wanted to add a second hard drive to improve reliability. The following instructions show how to convert the ZFS pool into a mirrored pool without rebooting.

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As I explained in an earlier post, we had issues with one of our backup servers. I decided to do a complete reinstall and ended up using an LSI SAS 9211 controller running in initiator-target mode (IT firmware), so all eight disks show up as plain HBAs and can be used to form a zpool. After considering my options I decided to go with raidz2, which will provide a good balance of storage space and safety.

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