Solaris ZFS Administration Guide

Damaged Devices in a ZFS Storage Pool

The term “damaged” covers a wide variety of possible errors. Examples include the following errors:

In some cases, these errors are transient, such as a random I/O error while the controller is having problems. In other cases, the damage is permanent, such as on-disk corruption. Even still, whether the damage is permanent does not necessarily indicate that the error is likely to occur again. For example, if an administrator accidentally overwrites part of a disk, no type of hardware failure has occurred, and the device need not be replaced. Identifying exactly what went wrong with a device is not an easy task and is covered in more detail in a later section.