There is always a possibility that one drive in an array may fail. Always keep a backup of your data. The best strategy is to keep several backup disks or tapes in case one tape is damaged.
If an error occurs on a primary or mirror partition of a Mirror Array, SoftRAID will warn you with a beep and a flashing icon on the Apple icon. The whole array will have a "failed status" if either disk is down.
Booting with one disk of an Array turned off will give you the "failed" status. It will have to be rebuilt before it's usable again.
If a volume fails more than once, shutdown and disconnect the suspected drive. Check it for SCSI connection problems or a controller failure.
If the bad disk is detected as not present, the good disk will blink. It will show "Failed/Primary Missing" or "Failed/Mirror Missing."
1. As soon as there's a problem, launch SoftRAID. The volume status will show either Failed or Out of Sync. The affected volume and disk icons will be blinking. Depending on they type of failure, you may be able to begin the rebuild immediately.
2. Click on the blinking volume to select it.
3. Select Rebuild from the Volume Menu. If the failed disk is not detected, you will have to choose a new disk to build as a mirror (See PowerSource TIL article #36428.)
4. Adjust the sliders to control the rebuild rate. Selecting higher I/O rates and I/O sizes will rebuild the Mirror faster, but slow down the computer.
Machines Affected: PowerTower Pro with RAID