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In Red Hat Linux the default file system is ext3, which an enhanced version of ext2 file system. Few of the ext3 features are as follows:
Consistency:
The ext3 file system provides the journaling, which means that e2fsck type of system checking is not necessary after improper system shut down. Actually e2fsck program used to check each mounted ext2 file system, which was a very time consuming process. And moreover, during this time any data on those volumes could not be accessed. Time taken in recovering an ext3 file system after improper shut down depends on the size of journal used to maintain consistency. It takes only one second to recover the default journal size.
Throughput:
Ext3 file system has higher speed than ext2, because the hard disk head motion is optimized now.
Integrity:
In ext3 file system you can select the level and type of protection, the data should receive. Its volumes are configured for high level of data protection
Partition types
We have three types of partitions, which can be configured on any hard disk. These are:
1. Primary partition- These are made up as the starting point for any O.S. to boot, as it stores the boot loader such as GRUB or LILO. We can make up to four primary partitions on a single hard disk, and only one out of these can be made active, to boot from.
2. Extended partition- This partition is made for increasing the number of partitions on the hard disk. We can make only one extended partition on the disk. We can neither use this partition directly nor make it active. We will have to make at least one partition within it, then only it can be used.
3. Logical partition- These are the partitions made within the extended partition. We can make maximum of 11 logical partitions on SCSI disk and maximum of 12 logical partitions on IDE disk.
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