Msg 3013, Level 16, State 1, Line 1

Hi,

I have sql server 2008 enterprise edition.

My log file is showing about to full the HDD and the database is in logshipping but it is paused due to some customer requirement.

I want to shrink the log file of source server because on restoring full backup on destination server asking the same space as source server.

I have used the:

Backup log dbname to disk='NULL';

but after completing 20% it is giving error:

Msg 3202, Level 16, State 1, Line 1
Write on "C:\Program Files\Microsoft SQL Server\MSSQL10_50.MSSQLSERVER\MSSQL\Backup\NULL" failed: 112(There is not enough space on the disk.)
Msg 3013, Level 16, State 1, Line 1
BACKUP LOG is terminating abnormally.

While c:\ drive has 30 GB free.

Thanks