Because a stripe or concatenation does not contain replicated data, when such a metadevice has a slice failure you must replace the slice, recreate the stripe or concatenation, and restore data from a backup.
When recreating a stripe, use a replacement slice that has at least the same size as the errored slice.
When recreating a concatenation, use a replacement slice that has at least the same capacity as the failed one.
If the failed slice in the stripe or concatenation is a submirror, refer to "How to Enable a Slice in a Submirror (DiskSuite Tool)" or "How to Replace a Slice in a Submirror (DiskSuite Tool)".