|Message:||%1 (%2) %3 Unable to read page %5 of database %4. Error %6.|
This Error event indicates that Microsoft® Exchange Server cannot read a page of a database as specified in the description of this event. Specifically, this event can be logged during a recovery operation if a page of a database cannot be read. If a page of a database cannot be read, the recovery or restore process fails.
To understand the cause of this event, it is helpful to understand how transaction log replay works in coordination with the pages of an Exchange Server database. When a recovery operation runs, Exchange Server first makes sure that the logical page number written on the page is correct. Then, Exchange Server makes sure that the page checksum is good. Changes for a page are associated with a sequence number in the log file.
Exchange Server includes the functionality to detect file-level damage to pages in its databases. The error associated with this event is specified in the description of the event.
The following are the most common errors that are associated with file-level damage to an Exchange Server database:
Error -1018 is the most frequently seen error. This indicates that an Exchange Server database has suffered damage at the file system level. Almost always, you will find the root cause for a -1018 error in one of the underlying systems that Exchange Server depends on, not in Exchange Server code itself. There are very few exceptions to this rule. The exceptions to date have been with regard to Exchange Server reporting a -1018 condition, not because Exchange Server itself causes a -1018 error.
Most -1019 and -1022 errors are also caused by a fault in an underlying system. However, you cannot rule out the chance that -1019 and -1022 errors might occur because of an issue unrelated to the file system.
For more information about -1018, -1019 and -1022 errors, see following Microsoft Knowledge Base articles:
To resolve this event, do one or more of the following:
For information about how the Microsoft Information Technology group (Microsoft IT) recovers from -1018 errors, see Exchange Server Error –1018: How Microsoft IT Recovers Damaged Exchange Databases.