Celtic Coding Solutions Blog

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SQL Server Database Backup Failure Operating system error 665

Had a SQL Server 2005 FULL Backup failure each night for the largest database (around 45GB).  Looking at the SQL Server Logs I notice the following error:-

BackupMedium::ReportIoError: write failure on backup device 'D:\BACKUP\SERVER_DATABASE_FULL_20160103_202215.bak'. Operating system error 665(error not found).

Looking at possible solutions:-
  • Backup HD drive is heavily fragmented, but as this is a SAN then that is not really possible.
  • Drive is compressed
Checking the drive and yes it was compressed so the network guys turned this off and bingo all we managed a full nightly backup.
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