Maintenance plan backups fail

Hi, I have a scheduled maintenance plan that backs up my database (SQL 2000). The db is 108 Meg. Usually the backup files are around 89 Meg and the transaction log backups are around 4.5 Megs.

The problem is that every once a while the backup fails with the following error:

[Microsoft SQL-DMO (ODBC SQLState: 42000)] Error 3202: [Microsoft][ODBC SQL Server Driver][SQL Server]Write on 'C:\Program Files\Microsoft SQL Server\MSSQL\BACKUP\CRM_db_200312230100.BAK' failed, status = 112. See the SQL Server error log for more details.
[Microsoft][ODBC SQL Server Driver][SQL Server]BACKUP DATABASE is terminating abnormally.

What usually happens is that the last backup that has failed has a size of 9 or 8 Gigs!

My guess is that a backup file gets corrupt (the size increases to 8 Gigs) and the server runs out of space and wont be able to do more backups. However I cant figure out why the backup file size increases to and gets corrupt.

Can anyone help me?What does the error log say...

did you a dbcc checkdb?|||Thanks for your reply, the error log says:

1.Source:Backup
BACKUP failed to complete the command BACKUP DATABASE [MYDB] TO DISK = N'C:\Program Files\Microsoft SQL Server\MSSQL\BACKUP\MYDB_db_200312230100.BAK' WITH INIT , NOUNLOAD , NOSKIP , STATS = 10, NOFORMAT

2.Source:spid54
BackupMedium::ReportIoError: write failure on backup device 'C:\Program Files\Microsoft SQL Server\MSSQL\BACKUP\MYDB_db_200312230100.BAK'. Operating system error 112(There is not enough space on the disk.).

3.Source:spid54
Internal I/O request 0x12844D98: Op: Write, pBuffer: 0x12C40000, Size: 983040, Position: 14752256, UMS: Internal: 0x103, InternalHigh: 0x0, Offset: 0xE11A00, OffsetHigh: 0x0, m_buf: 0x12C40000, m_len: 983040, m_actualBytes: 0, m_errcode: 112, BackupFile: C:\Program Files\Microsoft SQL

It looks like somthing happended to the last backup and the size increased to 8 Gigs and the disk ran out of space, but I can't figure why this happenes every once in a while.

Thanks



Originally posted by Brett Kaiser
What does the error log say...

did you a dbcc checkdb?|||You can't just assume that the backup gets corrupted without trying to restore it. Have you tried to do that?|||I havn't but there must be somthing wrong with it, since its 8 gig instead of 80 Megs, plus when I deleted it and made a backup manualy the size of the new backup was the regular 80 megs

Originally posted by rdjabarov
You can't just assume that the backup gets corrupted without trying to restore it. Have you tried to do that?