DOCUMENT:Q230215  01-OCT-1999  [exchange]
TITLE   :XADM: Backup Checksum Not Performed on Single Processor Computer
PRODUCT :Microsoft Exchange
PROD/VER:winnt:5.5 SP2
OPER/SYS:
KEYWORDS:exc55sp2 EXC55SP3Fix

======================================================================
-------------------------------------------------------------------------------
The information in this article applies to:

 - Microsoft Exchange Server, version 5.5 SP2 
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SYMPTOMS
========

When you attempt to perform an online backup of the Microsoft Exchange directory
and information store services on a single processor server, you do not receive
any error messages indicating the database failed checksum verification during
backup, and the backup process indicates it completed successfully.

RESOLUTION
==========

To resolve this problem, obtain the latest service pack for Exchange Server
version 5.5. For additional information, please see the following article in the
Microsoft Knowledge Base:

   Q191014 XGEN: How to Obtain the Latest Exchange Server 5.5 Service Pack

The English version of this fix should have the following file attributes or
later:

Component: JET

+-----------------------+
| FileName | Version    | 
+-----------------------+
| Ese.dll  | 5.5.2608.0 | 
+-----------------------+



STATUS
======

Microsoft has confirmed this to be a problem in Microsoft Exchange Server
version 5.5 Service Pack 2. This problem was first corrected in Exchange Server
5.5 Service Pack 3.

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

During the backup process, JET, the underlying database engine for Microsoft
Exchange Server, performs a checksum verification of each page read from the
database to ensure the health of the database being backed up. This issue
indicates that it is possible on single processor computers for Windows NT
Backup or other third-party backup utilities to inadvertently back up a
corrupted database without warning or errors.

For additional information on the checksum process, please see the following
article in the Microsoft Knowledge Base:

   Q151789 XADM: Error -1018 (JET_errReadVerifyFailure)

For additional information on the backup process, please see the following
articles in the Microsoft Knowledge Base:

   Q179308 XADM: How To Verify Exchange Online Backups

   Q182903 XADM: ESEUTIL Command Line Parameters

Additional query words:

======================================================================
Keywords          : exc55sp2 EXC55SP3Fix 
Technology        : kbExchangeSearch kbZNotKeyword2 kbExchange550SP2
Version           : winnt:5.5 SP2
Issue type        : kbbug
Solution Type     : kbfix

=============================================================================

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