Subsequent Backups Run Slower Than the First

ID: Q124159

The information in this article applies to:

Microsoft Windows NT Workstation version 3.5
Microsoft Windows NT Server version 3.5

SYMPTOMS

If you Windows NT Backup (NTBACKUP) or a third-party backup program, and your Exabyte 8505 drive is set for No Compression, the second time you back up files it takes longer than it did the first time. This problem occurs regardless of which backup software you use.

CAUSE

The Exabyte 8505 drive is initialized for compression on the first backup even though No Compression is selected. Subsequent backups are not be performed with compression. This problem occurs with high performance EISA or local bus SCSI controller cards which support high data transfer throughput.

WORKAROUND

To work around this problem, turn on hardware compression for all backups. If you are running NTBACKUP, select Hardware Compression in the Backup dialog box.

STATUS

Microsoft has confirmed this to be a problem in Windows NT version 3.5. This problem was corrected in Windows NT version 3.51.

Additional query words: prodnt ntbackup.exe backupexec

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