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[bacula/docs] / docs / manuals / fr / problems / tapetesting.tex

diff --git a/docs/manuals/fr/problems/tapetesting.tex b/docs/manuals/fr/problems/tapetesting.tex
index 7281f34e2f098a191264df9b50cf1129c0ceab1f..8b1bdee6552ce0e6a7b85202bbc11eced85e7720 100644 (file)
--- a/docs/manuals/fr/problems/tapetesting.tex
+++ b/docs/manuals/fr/problems/tapetesting.tex
@@ -778,9 +778,12 @@ the other modes that Bacula needs to function properly.
 \index[general]{Tape Hardware Compression and Blocking Size}
 \index[general]{Size!Tape Hardware Compression and Blocking Size}
 
-As far as I can tell, there is no way with the {\bf mt} program to check if
-your tape hardware compression is turned on or off. You can, however, turn it
-on by using (on Linux): 
+You should be able to verify the tape compression status with sysfs on Linux.
+\begin{verbatim}
+cat /sys/class/scsi_tape/nst0/default_compression
+\end{verbatim}
+
+You can, turn it on by using (on Linux): 
 
 \footnotesize
 \begin{verbatim}
@@ -1251,6 +1254,38 @@ certain tape modes and MTEOM.
 
 \end{description}
 
+\section{Tape Performance Problems}
+\index[general]{Tape Performance}
+If you have LTO-3 or LTO-4 drives, you should be able to
+fairly good transfer rates; from 60 to 150 MB/second, providing
+you have fast disks; GigaBit Ethernet connections (probably 2); you are 
+running multiple simultaneous jobs; you have Bacula data spooling
+enabled; your tape block size is set to 131072 or 262144; and
+you have set {\bf Maximum File Size = 5G}.
+
+If you are not getting good performance, consider some of the following
+suggestions from the Allen Balck on the Bacula Users email list:
+
+\begin{enumerate}
+\item You are using an old HBA (i.e. SCSI-1, which only does 5 MB/s)
+
+\item There are other, slower, devices on the SCSI bus. The HBA will
+   negotiate the speed of every device down to the speed of the
+   slowest.
+
+\item There is a termination problem on the bus (either too much or
+   too little termination). The HBA will drop the bus speed in an
+   attempt to increase the reliability of the bus.
+
+\item Loose or damaged cabling - this will probably make the HBA "think"
+   you have a termination problem and it will react as in 3 above.
+\end{enumerate}
+
+See if /var/adm/messages (or /var/log/messages) tells you what the sync
+rate of the SCSI devices/bus are. Also, the next time you reboot, the
+BIOS may be able to tell you what the rate of each device is.
+
+
 \section{Autochanger Errors}
 \index[general]{Errors!Autochanger}
 \index[general]{Autochanger Errors}