Week Fourteen Student name: Mike Gallagher Open source topic : Wireshark Student name: Shanell Looney Open source topic : Kee Pass Student name: Zachary Chamberlain Open source topic : VMWare Player Student name: James O'Keeffe Open source topic : Boot and Nuke Student name: Josh Fields Open source topic : OpenVPN

UNIX Operating System The dumpe2fs command prints the super block and blocks group information for the filesystem present on a device. Lab Assignment 12-1 can be submitted using the dumpe2fs command. The dumpe2fs command must be used on Knoppix software because the Unix / Linux filesystem blocks.

UNIX Operating System Blocks are used for two different purposes: Most blocks stores user data aka files (user data). Some blocks in every file system store the file system's metadata. So what is metadata? In simple words Metadata describes the structure of the file system. Most common metadata structure the superblock, inode and directories.

UNIX Operating System Superblock: Each file system is different and they have a type like ext2, ext3 etc. Further each file system has size like 5 GB, 10 GB and status such as mount status. In short each file system has a superblock, which contains information about file system such as: 1. File system type 2. Size 3. Status 4. Information about other metadata structures

UNIX Operating System If this information lost, you are in trouble (data loss) so Linux maintains multiple redundant copies of the superblock in every file system. This is very important in many emergency situations, for example you can use backup copies to restore damaged primary super block. Following command displays primary and backup superblock location on /dev/sda3: # dumpe2fs /dev/hda3 | grep -i superblock

UNIX Operating System primary superblock is present on block group 0, back up superblock is present on block group 1, 3, 5, 7, 9.

UNIX Operating System The cs.franklin.edu machine requires root permission to execute the dumpe2fs command. tune2fs command is helpful to manipulate the filesystem parameters of a ext2, or ext3, or ext4 type file system.

UNIX Operating System All lab assignments due 4/19/14