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Why does Offsite replication fail repeatedly with a number of errors in the offsite replication logs?

KB#:  KKB000546

QUESTION
Why does Offsite replication fail repeatedly with a number of errors in the offsite replication logs?:

20081209 07:16:28 - Write to d:\xxxxxxxx\xxxxxxxx\VolBackup\20081201 19.00.38\volBackup.tib failed. Wrote 0 of 65536 expected bytes.
20081209 07:16:28 - Loaded ignored file list: "c:\temp\OffsiteServerIgnoreList.txt"
20081209 07:16:29 - Session from IP address xxxxxxxxxx is done.

Checking the offsiterep.log file in the agent temp directory reveals many entries of the following form:

Windows error 32 - The process cannot access the file because it is being used by another process: - unable to open file "\\192.168.0.210\backups\volumes\xxxxxx\VolBackup\20081228 06.12.24\volBackup1.tib" to get file status.

Attempting to create a file of the same size as that being replicated on the off-site server results in the following Windows error:

Error writing file: 665 The requested operation could not be completed due to a file system limitation

ANSWER
The offsite server volume is heavily fragmented, and the operating system is unable to extend the offsite replica of the files due to a design limitation of NTFS.

Please see the Microsoft article for a description of the cause: http://support.microsoft.com/kb/957180/


Free up at least 20% free disk space on the offsite server disk volume affected and then defragment the volume.

MORE INFORMATION
In this instance, due to the level of defragmentation and the size of the volume, a number of defragmentation tools failed to successfully defragment the volume: namely the inbuilt windows defragmenter, wincontig, IObit smart defrag and defraggler.

JKDefrag was able to initiate defragmentation of the volume. It can be downloaded from http://www.kessels.com/Jkdefrag/. Note that this is a 3rd party tool that Kaseya does not support or imply any warranty for.

APPLIES TO
Backup tab
Offsite server

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