-24201 Chunk Checksum problem

[martinraz]

Greetings,

 

 

 

I am experiencing problems with Retrospect 4.3 running on a Mac OS 8.1 G-3. I am frequently receiving the error "-24201 chunk checksum doesn't match". I have looked at the knowledgebase articles relative to this error message which have indicated a catalog problem. I have erased the tapes, created new catalogs etc., but the problem persists. The full backup works fine, but the next day when I attempt to backup only those files which have changed, I receive the -24201 error message. I am only backing up Mac workstations.

 

 

 

Any help would be appreciated.

 

 

 

Thank you.

 

 

 

Martin Raz

[Mayoff]

Tech Note NO. 307 MACINTOSH INTERNAL CONSISTENCY CHECK AND CONFIGURATION ERRORS

 

Retrospect and Retrospect Express for Macintosh use an internal integrity checking system which will alert the user to problems encountered when performing tasks within Retrospect. These "Internal Consistency Check" and "Chunk Checksum" errors could be caused by corruption to a vital Retrospect file, memory corruption or system compatibility problem. This note describes some of these errors, as well as the files with which they are often associated. This document is meant as an overview for a family of error messages. If you believe your error can not be resolved with the troubleshooting options provided, please contact Dantz Technical Support for assistance.

 

 

 

Identifying the Error

 

The following is a list of internal consistency check errors that have been encountered by Dantz and the resolution. If your error message is not on this list, continue to the next section of this document.

 

 

 

dev.c-1027

 

This error occurs only in Retrospect 3.0. Upgrade to the latest version of Retrospect.

 

 

 

elem.c-696

 

This error can occur when a run document is placed in the Shutdown Items folder on a Macintosh running under System 7.5 with Retrospect versions before 3.0. Update to the latest version of Retrospect.

 

 

 

elem.c-897

 

There are three main reasons for this error: 1. The configuration file is damaged. (This is almost always the case and is especially likely if the error occurred while Retrospect or Retrospect Express was launching.) 2. A catalog file may be corrupt. 3. Retrospect 2.0A or an earlier version attempted to erase a removable cartridge while file sharing was turned on. Turn off file sharing or upgrade Retrospect to the latest version.

 

 

 

malloc.c-97

 

This is frequently a one-time error which does not re-occur after restarting your Macintosh. If it happens when going to Configure>Backup Sets, then you should upgrade Retrospect or Retrospect Express.

 

 

 

tyce.c-2524

 

This error may occur if your Backup Server scripts are corrupted. Duplicate your scripts from the Automate>Scripts window and delete the original scripts.

 

 

 

vhand.c-427

 

This is almost always a one-time error which does not re-occur after restarting your Macintosh. If it does re-occur, you should follow the advice below. In some cases this error has also been caused by corrupted System Software.

 

 

 

xscav.c-128

 

This error may occur when using an OnStream tape drive with Retrospect 4.2. Update to the latest version of Retrospect for the Macintosh

 

 

 

When experiencing internal consistency check, access violation or exception error messages it is very important to restart the computer following each error message. Running Retrospect immediately following an error of this type without a system restart will leave Retrospect in an unstable state.

 

When troubleshooting Internal Consistency Check and other Retrospect errors it is important to identify what task Retrospect was attempting to perform at the time the error is reported. Knowing when the error happens will help identify the best course of action for the resolution of the problem.

 

 

 

During Retrospect Launch

 

If Retrospect reports an Internal Consistency Check error message when launching, a likely cause for the error would be corrupt Retrospect preferences. Try moving the retro.config (4.2) or Retro.Express Config (4.2) file onto the trash (don't empty the trash). This file can be found in the Retrospect folder located within System Folder's Preferences folder. The retro.config (4.2) or Retro.Express Config (4.2) file contains all of your Retrospect scripts, options and the database of logged in clients (if appropriate). Restart the computer and attempt to launch Retrospect again. If the problem continues, please contact Dantz Technical Support for assistance. If you are contacting Technical Support via e-mail, please include the most recent Retrospect.error.log file located in the Retrospect preferences folder.

 

 

 

If launching Retrospect was successful after removing the config file from the Retrospect folder, then this indicates the previous retro.config (4.2) or Retro.Express Config (4.2) file may have been damaged. At this point you will need to recreate your scripts and login your existing clients. Rather than rebuild your scripts, some users may be able to restore an older version of the config file from a backup.

 

 

 

When Saving Snapshot, Updating Catalog or Trouble Matching

 

During a backup Retrospect may report that it can not save changes to the Snapshot or the Snapshot could not be saved due to an error -24205 (chunk file damaged during save) or trouble matching –24201 (chunk checksum didn't match). Retrospect may also report "trouble matching" errors when doing a restore. These errors often indicate corruption within a Retrospect backup set catalog file.

 

When troubleshooting these error messages it is important to identify which catalog file is damaged. The operations log will often indicate which catalog file was being accessed at the time this error occurred. If the errors appear isolated to one specific catalog file you will need to either rebuild the catalog from the media (chapter 9 of the Retrospect User's Guide) or create a new backup set to replace the one reporting the error. If the error seems to be happening to several backup sets see the section below on "Chronic Errors".

 

 

 

You can also try the following technique to identify which catalog file is damaged. Set up a restore by searching on a blank file name so Retrospect scans all files in the catalog. If the error occurs, you know this catalog is corrupt.

 

 

 

During File Copy

 

If Retrospect reports an "Internal Consistency Check" error during the copy phase of a backup or restore you may be experiencing one of several possible problems. It is important to first restart the computer following the error. For many users the error will not return following a system restart. Try the previous operation again. Try to reproduce the problem using a different backup set. If the problem is solved by trying a different backup set, you may need to rebuild the catalog file for the previous backup set. If the problem continues, contact Dantz Technical Support for assistance.

 

When Scanning Icons

 

If Retrospect reports an error when scanning "Icons" then you may have a corrupt Retro.Icon (4) file. Try removing this file from the Retrospect Preferences folder. The file will be automatically recreated by Retrospect.

 

 

 

Chronic Errors

 

If you find these error are happening frequently or they come back after the problem appeared to have been fixed, then you may have a more complicated problem that is resulting in chronic errors.

 

 

 

Unreliable Device Communication

 

Backup devices can be connected to your computer in several different ways (SCSI, USB, FireWire). If your device is not working correctly or is not communicating with the computer as expected, your Retrospect backups may not run as expected. It is important to check with the vendor of your SCSI card, or other adapter vendor for driver and firmware updates that may be appropriate for your configuration. For more details on device communication and configuration see Chapter 3 and 10 of the Retrospect User's Guide.

 

 

 

Third-Party Software Conflicts

 

Macintosh users can try disabling all non-Apple extensions (including control panels). If that helps, enable extensions one by one, restart, and test until the problem re-occurs, at which time you will know the culprit is the most recently enabled extension. Permanently disable the problem-causing extension.

 

 

 

Operating System

 

Macintosh users can try to reproduce the error message while booted from the Retrospect CD-ROM. If the error is not reproducible while booted from the Retrospect CD, then this may indicate a corrupt Mac OS system folder. A clean install of the Mac OS may be required to eliminate the error message.

 

 

 

Hard Disk Media Problems

 

Retrospect preferences or catalog files could become damaged if these files are stored on a hard disk with media problems. Macintosh users should consider running Apple’s Disk First Aid or a commercial disk checking utility like Norton Utilities or Tech Tool Pro.

 

 

 

Getting Help from Dantz Technical Support

 

Should you be unable to solve an internal consistency error problem on your own, Dantz Technical Support will be glad to help you. When Retrospect or Retrospect Express experiences such an error, it generates an error log text file. The Macintosh Retrospect.error.log file is located in the Retrospect preferences folder. Send the contents of this file to Dantz Technical Support via electronic mail, fax, or post. Please include notes on what you were doing with Retrospect or Retrospect Express when the error occurred, and provide all system and device information.