Using tape Library PV114x or other with Linux

It is dead simple, make sure that when you plug in SAS cable the light on the SAS card comes up, I spent hours in struggling on Linux when drives did not appear and finally when i push the SAS connector bit inside all flashes 🙂

You only need a software name mt and tar which most of Linux OS already have.. It works same on Ubuntu and or Centos /Redhat flavours.

Replace /dev/st0 with your actual tape drive name.  Usually it is name like /dev/st0 /dev/st1 and so on ..

Rewind tape drive:

Backup any folder:

Display list of files on tape drive:

Restore /anyfolder directory:


Unload the tape:

Display status information about the tape unit:

Erase the tape:

You can go BACKWARD or FORWARD on tape with mt command itself:

(a) Go to end of data:

(b) Goto previous record:

(c) Forward record:

To compare tape backup, enter:

To restore tape in case of data loss or hard disk failure:


d : find differences between archive and file system
x : extract files from an archive
l : list the contents of an archive
p : ignore umask when extracting files
M : create/list/extract multi-volume archive (multiple tapes)
z : Compress backup using gzip
v : verbosely list files processed
f /dev/st0 : Tape device name
/anyfolder : Backup /anyfolder file system

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Node cannot be added to the GPFS cluster


There is an indication leading you to the conclusion that a node cannot be added to a cluster and steps to follow to correct the problem.

That indication is:

  • You issue the mmcrcluster or mmaddnode command and receive the message:
    Node nodeName was not added to the cluster. The node appears to already belong to a GPFS™ cluster.
Steps to follow if a node cannot be added to a cluster:

  1. Run the mmlscluster command to verify that the node is not in the cluster.
  2. If the node is not in the cluster, issue this command on the node that could not be added:
    mmdelnode -f
  3. Reissue the mmaddnode command.

Command line view webcam from ubuntu to browser

This took hours to figure out. I was trying to install MJPG-streamer and running VLC command lines and all this crap but nothing worked.

First install motion:

~> sudo apt-get install motion

Then create a config file:

~> mkdir ~/.motion
~> nano ~/.motion/motion.conf

In it, the bare minimum to run a web server and view it on other computers:

webcam_port 8081
webcam_localhost off

Then run motion:

~> motion

Now you can view the webcam at http://hostname:8081 If it doesn’t work, try rebooting between steps or something.

Bonnie++ cannot open file

bonnie++ Can’t open file


While running bonnie++ , you may face this error :



# ./bonnie++ -d /mnt -s 8056M -n 0 -m TEST_IO -f -b -u username

Using uid:1000, gid:1000.

Can’t open file ./Bonnie.3497.000


You need to add -u root:root , to the command line like :


./bonnie++ -d /mnt -s 8056M -n 0 -m TEST_IO -f -b -u root:root