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Q168357: XADM: Event ID: 24 Asynchronous Read Page Time Error

Article: Q168357
Product(s): Microsoft Exchange
Version(s): winnt:4.0,5.0,5.5
Operating System(s): 
Keyword(s): kbusage exc4 exc5 exc55
Last Modified: 16-OCT-1999

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The information in this article applies to:

- Microsoft Exchange Server, versions 4.0, 5.0, 5.5 
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SYMPTOMS
========

Directory replication may stop and the Event Viewer Application Log may display
the following error:

  Event ID: 24
  Source:   EDB
  Type:     Error
  Category: Database Page Cache

The description may be similar to:

  MSExchangeDS ((198) ) Asynchronous read page time error -1018 (
  (1:21534, 21304)
  (0-24430833), (0-60422491), 1298669031, 1900239879 ) occurred. Please
  restore the databases from a previous backup.

CAUSE
=====

The Directory database (Dir.edb) most likely has become corrupt. To discover
which database is corrupt, start the Windows NT Event Viewer and look in the
Application log for the following Event ID:

  Event ID: 39
  Source:   EDB
  Type:     Warning
  Category: Logging/Recovery

The description may be similar to:

  ((269) ) Unable to read header of database F:\Exchsrvr\Mdbdata\Dir.edb.
  Error -1206.

The file listed in the description is the corrupt database.

RESOLUTION
==========

To resolve this problem, do one of the following:

- Restore Dir.edb from a previous backup.

  -OR-

- Repair the bad page of data by running Edbutil.exe:

CAUTION: Edbutil.exe is a low-level Exchange database engine utility that
defragmentsand checks the consistency of the database. The repair option (which
is EDBUTIL /d /r <dbname>) attempts to repair bad pages or remove bad
pages if the repair is unsuccessful. If a page is removed using the repair
option, there most certainly will be data loss.

1. Make sure you have made a full backup of the Dsadata directory.

2. Make sure you have enough free disk space. You must have more free disk space
  than the size of the DIR.EDB file. This free space should be on the drive
  from which Edbutil.exe is run.

3. From the \exchsrvr\bin directory run:

  Edbutil /d /r /ds

MORE INFORMATION
================

If you receive an error running Edbutil /d /ds /r, you may need to specify the
entire path to the Dir.edb file. For example:

  edbutil /d c:\exchsrvr\dsadata\dir.edb /r

Refer to the Microsoft Exchange Administrators guide for more details on the use
of Edbutil.exe.

Additional query words:

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Keywords          : kbusage exc4 exc5 exc55 
Technology        : kbExchangeSearch kbExchange500 kbExchange550 kbExchange400 kbZNotKeyword2
Version           : winnt:4.0,5.0,5.5
Issue type        : kbprb

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