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MapError, Scanning incomplete

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I'm suddenly getting this whenever backing up one of my drives to a particular media set using one of my scripts:

 

- 4/3/14 5:18:53 PM: Copying DAS 2TB
MapError: unknown Mac error -1401
Scanning incomplete, error -1002 ( unknown Mac OS error)
4/3/14 5:38:42 PM: Execution incomplete
Total duration: 00:26:15 (00:26:07 idle/loading/preparing)

 

Other drives backed up with this script work fine.

 

Scanning the same drive using a different script (with same rules), backing up to a different media set, works fine.  

 

I understand from previous posts that the MapError message is ignorable.  However in my case it is causing the backup to fail.

 

This is my boot drive.  I ran Disk Utility and it says the disk is OK.  What else can I try?

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Running Disk Utility and check the drive (not just permissions) usually clears this kind of problem.

But you have a special twist to the problem: The backup works with a different media set. So I think there is something wrong with the catalog file. Try recreating the catalog file and see if that helps.

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Good thought -- I'll try that.  But with 4 TB in the media set, it's probably going to take a few days.

I don't think it has so much to do with size. I think the time is more related to the number of files.

 

On our setup of seven years old hardware it takes about 6 hours per TB.

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Catalog rebuild didn't help.  After some false starts, it took a couple of days to do the rebuild.  It completed and it was successful except for these messages which I assume are inconsequential:

 

 

+ Executing Rebuild at 4/7/14
To Backup Set Offsite 3 TB...
!Generated MD5 digest for file "/Volumes/DAS 2TB/Users/morrie/Library/Logs/CrashReporter/Media Pro Importer_2012-03-23-194754_MG.crash" does not match stored MD5 digest.
!Generated MD5 digest for file "/Volumes/DAS 2TB/Users/morrie/Library/Logs/CrashReporter/Media Pro Importer_2012-03-23-194846-1_MG.crash" does not match stored MD5 digest.
!Generated MD5 digest for file "/Volumes/DAS 2TB/Users/morrie/Library/Logs/CrashReporter/Media Pro Importer_2012-07-04-091546-2_MG.crash" does not match stored MD5 digest.
!Generated MD5 digest for file "/Volumes/DAS 2TB/Users/morrie/Library/Logs/CrashReporter/Media Pro Importer_2012-07-04-091546-3_MG.crash" does not match stored MD5 digest.
!Generated MD5 digest for file "/Volumes/DAS 2TB/Users/morrie/Library/Logs/CrashReporter/Media Pro Importer_2012-07-04-091546-4_MG.crash" does not match stored MD5 digest.
!Generated MD5 digest for file "/Volumes/DAS 2TB/Users/morrie/Library/Logs/CrashReporter/Media Pro Importer_2012-07-04-091546-5_MG.crash" does not match stored MD5 digest.
!Generated MD5 digest for file "/Volumes/DAS 2TB/Users/morrie/Library/Logs/CrashReporter/Media Pro Importer_2012-07-04-091546-6_MG.crash" does not match stored MD5 digest.
!Generated MD5 digest for file "/Volumes/DAS 2TB/Users/morrie/Library/Logs/CrashReporter/Media Pro Importer_2012-07-04-091546-7_MG.crash" does not match stored MD5 digest.
!Generated MD5 digest for file "/Volumes/DAS 2TB/Users/morrie/Library/Logs/CrashReporter/Media Pro Importer_2012-07-04-091546-8_MG.crash" does not match stored MD5 digest.
4/9/14 2:31:01 AM: 9 execution errors
Completed: 4483368 files, 3.2 TB
Performance: 1,754 MB/minute
Duration: 1:08:35:53 (00:39:33 idle/loading/preparing)

 

Then I tried a backup again and got exactly the same MapError as before.  I looked in the console log and I didn't see any more than this one line:

 

4/9/14 9:14:16 PM com.retrospect.retroengine[81] #2> MapError: unknown Mac error -1401

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So in desperation, I tried another reboot -- the first reboot made no difference, but that one was before I rebuilt the catalog.  Suddenly, it works again.

 

Go figure.

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