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Ordered — Only metadata is saved in the journal.

Metadata are journaled only after writing the content to disk. This is the default.

Writeback — Only metadata is saved in the journal. Metadata might be journaled either before or after the content is written to the disk.

Ext4 Ext4 stands for fourth extended file system. Supports huge individual file size and overall file system size.

Directory can contain a maximum of 64, subdirectories as opposed to 32, in ext3 You can also mount an existing ext3 fs as ext4 fs without having to upgrade it. Several other new features are introduced in ext4: multiblock allocation, delayed allocation, journal checksum.

All you need to know is that these new features have improved the performance and reliability of the filesystem when compared to ext3. You will lose your data!

But, I feel better doing the conversion offline. Validate a zip archive Hack Tar Command Basics Hack Repeat previous command quickly using 4 different methods Hack Execute a specific command from history Hack Execute previous command that starts with a specific word Hack Clear all the previous history using option -c Hack Substitute words from history commands Hack Substitute a specific argument for a specific command Hack Partition using fdisk Hack Format a partition using mke2fsk Hack Mount the partition Hack Fine tune the partition using tune2fs Hack Create a swap file system.

Create a new user Hack Create a new group and assign to an user Hack Use ssh-copy-id along with ssh-agent Hack Crontab Hack Pass different httpd. Use a temporary DocumentRoot without modifying httpd.

Increase the Log Level temporarily Hack Display the modules inside Apache Hack Heres an example:. Debug a shell script Hack Bash Shell Variables The following example starts apache only if it is not already running.

Du Command Hack Since the tar command was added to the hash table without executing it, the hits will be 0 for the tar command as shown below. But, I feel better doing the conversion offline.