Updates

[bacula/docs] / docs / manual-de / tapetesting.tex

diff --git a/docs/manual-de/tapetesting.tex b/docs/manual-de/tapetesting.tex
index ad8786b67902e7b78eb263610917388d7920a1f7..b2ee2e83499657a382a0d9514a7b642a0954d304 100644 (file)
--- a/docs/manual-de/tapetesting.tex
+++ b/docs/manual-de/tapetesting.tex
@@ -102,6 +102,35 @@ bacula-users} email list, but specify which of the steps you have successfully
 completed. In particular, you may want to look at the 
 \ilink{ Tips for Resolving Problems}{problems1} section below. 
 
+\label{NoTapeInDrive}
+\subsubsection*{Problems When no Tape in Drive}
+\index[general]{Problems When no Tape in Drive}
+\addcontentsline{toc}{subsubsection}{Problems When no Tape in Drive}
+When Bacula was first written the Linux 2.4 kernel permitted opening the
+drive whether or not there was a tape in the drive. Thus the Bacula code is
+based on the concept that if the drive cannot be opened, there is a serious
+problem, and the job is failed.
+
+With version 2.6 of the Linux kernel, if there is no tape in the drive, the
+OS will wait 2 minutes (default) then return a failure, and consequently,
+Bacula version 1.36 and below will fail the job.  This is important to keep
+in mind, because if you use and option such as {\bf Offline on Unmount =
+yes}, there will be a point when there is no tape in the drive, and if
+another job starts or if Bacula asks the operator to mount a tape, when
+Bacula attempts to open the drive (about a 20 minute delay), it will fail
+and Bacula will fail the job.
+
+In version 1.38.x, the Bacula code partially gets around this problem -- at
+least in the initial open of the drive.  However, functions like Polling
+the drive do not work correctly if there is no tape in the drive.
+Providing you do not use {\bf Offline on Unmount = yes}, you should not
+experience job failures as mentioned above.  If you do experience such
+failures, you can also increase the {\bf Maximum Open Wait} time interval,
+which will give you more time to mount the next tape before the job is
+failed.
+
+
+
 \subsubsection*{Specifying the Configuration File}
 \index[general]{File!Specifying the Configuration}
 \index[general]{Specifying the Configuration File}