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Ext2(Extended 2 file system )
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Ext3(Extended 3 file system )
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Ext4(Extended 4 file system )
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This was developed to overcome the limitation of the original ext file system.
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The main benefit of ext3 is that it allows journaling. Journaling has a dedicated area in the file system, where all the changes are tracked. When the system crashes, the possibility of file system corruption is less because of journaling.
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The ext4 file system has major improvements in terms of performance, scalability, and reliability.
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Maximum individual file size can be from 16 GB to 2 TB
Overall ext2 file system size can be from 2 TB to 32 TB
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Maximum individual file size can be from 16 GB to 2 TB
Overall ext2 file system size can be from 2 TB to 32 TB
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support files and file systems of up to 16 terabytes in size
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You can’t convert a ext2 file system to ext3 file system
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You can convert a ext2 file system to ext3 file system directly (without backup/restore).
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You can convert a ext3 file system to ext4 file system directly
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Ext2 faster than ext3
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prevent filesystem corruption in the case of an unclean shutdown, That makes ext3 a bit slower than ext2
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. Ext4 uses extents , which improves performance when using large files and reduces metadata overhead for large files
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it has sparse super blocks feature which increase file system performance
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But ext3 gets more reliability and a better performance
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The ext4 file system, often waits several seconds to write out changes to disk, allowing it to combine and reorder writes for better disk performance than ext3
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Ext2 will not provide a fast recovery from disk problems
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allows fast recovery from disk problems
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ext4 also labels unallocated block groups and inode table sections accordingly, which allows them to be skipped during a file system check. This makes for quicker file system checks, which becomes more beneficial as the file system grows in size.
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