Managing ZFS File Systems in Oracle® Solaris 11.2

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Updated: December 2014

Resolving Data Problems in a ZFS Storage Pool

Examples of data problems include the following:

  • Pool or file system space is missing

  • Transient I/O errors due to a bad disk or controller

  • On-disk data corruption due to cosmic rays

  • Driver bugs resulting in data being transferred to or from the wrong location

  • A user overwriting portions of the physical device by accident

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 you accidentally overwrite part of a disk, no type of hardware failure has occurred, and the device does not need to be replaced. Identifying the exact problem with a device is not an easy task and is covered in more detail in a later section.