XADM: Backup Checksuming Not Performed on Single Processor Computers

ID: Q230215

The information in this article applies to:

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

A supported fix that corrects this problem is now available from Microsoft, but it has not been fully regression tested and should be applied only to systems experiencing this specific problem. If you are not severely affected by this specific problem, Microsoft recommends that you wait for the next Microsoft Exchange Server version 5.5 service pack that contains this fix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:

http://www.microsoft.com/support/supportnet/overview/overview.asp
The English version of this fix should have the following file attributes or later:

Component: JET

FileName Version
Ese.dll 5.5.2608.0

This hotfix has been posted to the following Internet location as Psp2esea.zip and Psp2esei.zip:
ftp://ftp.microsoft.com/bussys/exchange/exchange-public/fixes/Eng/Exchg5.5/PostSP2/ese-fix/


NOTE: If this product was already installed on your computer when you purchased it from the Original Equipment Manufacturer (OEM) and you need this fix, please call the Pay Per Incident number listed on the above Web site. If you contact Microsoft to obtain this fix, and if it is determined that you only require the fix you requested, no fee will be charged. However, if you request additional technical support, and if your no-charge technical support period has expired, or if you are not eligible for standard no-charge technical support, you may be charged a non-refundable fee.

For more information about eligibility for no-charge technical support, see the following article in the Microsoft Knowledge Base:
Q154871 Determining If You Are Eligible for No-Charge Technical Support


STATUS

Microsoft has confirmed this to be a problem in Microsoft Exchange Server version 5.5 Service Pack 2.


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          : 
Version           : winnt:5.5 SP2
Platform          : winnt 
Issue type        : kbbug

Last Reviewed: August 8, 1999