Oracle Solaris ZFS Administration Guide

System Reporting of ZFS Error Messages

In addition to persistently tracking errors within the pool, ZFS also displays syslog messages when events of interest occur. The following scenarios generate events to notify the administrator:

If ZFS detects a device error and automatically recovers from it, no notification occurs. Such errors do not constitute a failure in the pool redundancy or in data integrity. Moreover, such errors are typically the result of a driver problem accompanied by its own set of error messages.