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Besides the journal, what are the differences between ext2 and ext3?

All my superblocks are corrupt!With full data journaling, why does data appear in the directory immediately?How are files laid out in ext2/ext3/ext4?What is the space overhead of different filesystems?What mount option to use for ext3 file system to minimise data loss or corruption?Unable to mount root filesystem rw with journal“write-once archive”: ext2 vs ext4^has_journal vsExt filesystem: what happens if a journal is replayed after a crash

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1

I just saw an answer question about filesystems for embedded hardware on another Stack Exchange site. The question was "What file system format should I use on flash memory?" and the answer suggested the ext2 filesystem, or the ext3 filesystem with journaling disabled a'la tune2fs -O ^has_journal /dev/sdbX

This made me wonder... What would the advantage be to using ext3 (with journaling disabled) over ext2? As far as I understood, the only real difference between the two was the journal. What other differences between ext2 and ext3 are there?

filesystems ext3 ext2

share|improve this question

edited 1 hour ago

Pang

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asked Jul 20 '12 at 12:37

JoshJosh

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add a comment | 

3

1

I just saw an answer question about filesystems for embedded hardware on another Stack Exchange site. The question was "What file system format should I use on flash memory?" and the answer suggested the ext2 filesystem, or the ext3 filesystem with journaling disabled a'la tune2fs -O ^has_journal /dev/sdbX

This made me wonder... What would the advantage be to using ext3 (with journaling disabled) over ext2? As far as I understood, the only real difference between the two was the journal. What other differences between ext2 and ext3 are there?

filesystems ext3 ext2

share|improve this question

edited 1 hour ago

Pang

19111 silver badge77 bronze badges

asked Jul 20 '12 at 12:37

JoshJosh

3,92777 gold badges4343 silver badges6565 bronze badges

add a comment | 

I just saw an answer question about filesystems for embedded hardware on another Stack Exchange site. The question was "What file system format should I use on flash memory?" and the answer suggested the ext2 filesystem, or the ext3 filesystem with journaling disabled a'la tune2fs -O ^has_journal /dev/sdbX

This made me wonder... What would the advantage be to using ext3 (with journaling disabled) over ext2? As far as I understood, the only real difference between the two was the journal. What other differences between ext2 and ext3 are there?

filesystems ext3 ext2

share|improve this question

edited 1 hour ago

Pang

19111 silver badge77 bronze badges

asked Jul 20 '12 at 12:37

JoshJosh

3,92777 gold badges4343 silver badges6565 bronze badges

share|improve this question

edited 1 hour ago

Pang

19111 silver badge77 bronze badges

asked Jul 20 '12 at 12:37

JoshJosh

3,92777 gold badges4343 silver badges6565 bronze badges

share|improve this question

edited 1 hour ago

Pang

19111 silver badge77 bronze badges

asked Jul 20 '12 at 12:37

JoshJosh

3,92777 gold badges4343 silver badges6565 bronze badges

edited 1 hour ago

Pang

19111 silver badge77 bronze badges

edited 1 hour ago

Pang

19111 silver badge77 bronze badges

asked Jul 20 '12 at 12:37

JoshJosh

3,92777 gold badges4343 silver badges6565 bronze badges

asked Jul 20 '12 at 12:37

JoshJosh

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2 Answers
2

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5

The journal is the difference. You can not have an ext3 filesystem without a journal. If you disable the journal, it becomes an ext2 filesystem again.

ext4 has a number of beneficial features and can run without a journal, making it a much better choice.

share|improve this answer

answered Jul 20 '12 at 12:55

psusipsusi

14.1k22 gold badges2828 silver badges4040 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  That's what I thought. I have used both ext3 and ext4 and know how much better ext4 is... I guess then the only benefit of ext3 sans journal would be that you could re-enable the journal later...
  
  – Josh
  Jul 20 '12 at 12:58
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Josh, as I said before, there is no such thing as "ext3 sans journal", that is simply ext2. You can add or remove the journal whether you started as ext3 or not.
  
  – psusi
  Jul 20 '12 at 13:01
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Oh, really? I didn't understand that, sorry for being dense. I mean I thought before I asked the question that the only difference was the journal, but I didn't realize you could just add a journal to an ext2 filesystem and bam! now it's ext3. That's pretty neat.
  
  – Josh
  Jul 20 '12 at 13:10
  

  
  
  
  

add a comment | 

1

• Online file system growth.


• Htree indexing for larger directories

share|improve this answer

answered Jul 20 '12 at 12:48

MatteoMatteo

7,14044 gold badges4040 silver badges6060 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Actually those features are part of ext2.
  
  – psusi
  Jul 20 '12 at 12:56
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @psusi Are you sure? ext2 Htree indexes were originally implemented for ext2 but the patch never made it to the official branch, so I would say that they are not in any standard ext2 implementation. I really did not find any reference of the online system growth other than by ext3.
  
  – Matteo
  Jul 20 '12 at 13:37
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yep.... see /etc/mke2fs.conf. It lists resize and dir_index as defaults, applied to all flavors, including ext2. The only one ext3 adds is the journal.
  
  – psusi
  Jul 20 '12 at 18:42
  

  
  
  
  

add a comment | 

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5

The journal is the difference. You can not have an ext3 filesystem without a journal. If you disable the journal, it becomes an ext2 filesystem again.

ext4 has a number of beneficial features and can run without a journal, making it a much better choice.

share|improve this answer

answered Jul 20 '12 at 12:55

psusipsusi

14.1k22 gold badges2828 silver badges4040 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  That's what I thought. I have used both ext3 and ext4 and know how much better ext4 is... I guess then the only benefit of ext3 sans journal would be that you could re-enable the journal later...
  
  – Josh
  Jul 20 '12 at 12:58
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Josh, as I said before, there is no such thing as "ext3 sans journal", that is simply ext2. You can add or remove the journal whether you started as ext3 or not.
  
  – psusi
  Jul 20 '12 at 13:01
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Oh, really? I didn't understand that, sorry for being dense. I mean I thought before I asked the question that the only difference was the journal, but I didn't realize you could just add a journal to an ext2 filesystem and bam! now it's ext3. That's pretty neat.
  
  – Josh
  Jul 20 '12 at 13:10
  

  
  
  
  

add a comment | 

5

The journal is the difference. You can not have an ext3 filesystem without a journal. If you disable the journal, it becomes an ext2 filesystem again.

ext4 has a number of beneficial features and can run without a journal, making it a much better choice.

share|improve this answer

answered Jul 20 '12 at 12:55

psusipsusi

14.1k22 gold badges2828 silver badges4040 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  That's what I thought. I have used both ext3 and ext4 and know how much better ext4 is... I guess then the only benefit of ext3 sans journal would be that you could re-enable the journal later...
  
  – Josh
  Jul 20 '12 at 12:58
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Josh, as I said before, there is no such thing as "ext3 sans journal", that is simply ext2. You can add or remove the journal whether you started as ext3 or not.
  
  – psusi
  Jul 20 '12 at 13:01
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Oh, really? I didn't understand that, sorry for being dense. I mean I thought before I asked the question that the only difference was the journal, but I didn't realize you could just add a journal to an ext2 filesystem and bam! now it's ext3. That's pretty neat.
  
  – Josh
  Jul 20 '12 at 13:10
  

  
  
  
  

add a comment | 

The journal is the difference. You can not have an ext3 filesystem without a journal. If you disable the journal, it becomes an ext2 filesystem again.

ext4 has a number of beneficial features and can run without a journal, making it a much better choice.

share|improve this answer

answered Jul 20 '12 at 12:55

psusipsusi

14.1k22 gold badges2828 silver badges4040 bronze badges

share|improve this answer

answered Jul 20 '12 at 12:55

psusipsusi

14.1k22 gold badges2828 silver badges4040 bronze badges

answered Jul 20 '12 at 12:55

psusipsusi

14.1k22 gold badges2828 silver badges4040 bronze badges

answered Jul 20 '12 at 12:55

psusipsusi

14.1k22 gold badges2828 silver badges4040 bronze badges

1

• Online file system growth.


• Htree indexing for larger directories

share|improve this answer

answered Jul 20 '12 at 12:48

MatteoMatteo

7,14044 gold badges4040 silver badges6060 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Actually those features are part of ext2.
  
  – psusi
  Jul 20 '12 at 12:56
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @psusi Are you sure? ext2 Htree indexes were originally implemented for ext2 but the patch never made it to the official branch, so I would say that they are not in any standard ext2 implementation. I really did not find any reference of the online system growth other than by ext3.
  
  – Matteo
  Jul 20 '12 at 13:37
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yep.... see /etc/mke2fs.conf. It lists resize and dir_index as defaults, applied to all flavors, including ext2. The only one ext3 adds is the journal.
  
  – psusi
  Jul 20 '12 at 18:42
  

  
  
  
  

add a comment | 

1

• Online file system growth.


• Htree indexing for larger directories

share|improve this answer

answered Jul 20 '12 at 12:48

MatteoMatteo

7,14044 gold badges4040 silver badges6060 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Actually those features are part of ext2.
  
  – psusi
  Jul 20 '12 at 12:56
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @psusi Are you sure? ext2 Htree indexes were originally implemented for ext2 but the patch never made it to the official branch, so I would say that they are not in any standard ext2 implementation. I really did not find any reference of the online system growth other than by ext3.
  
  – Matteo
  Jul 20 '12 at 13:37
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yep.... see /etc/mke2fs.conf. It lists resize and dir_index as defaults, applied to all flavors, including ext2. The only one ext3 adds is the journal.
  
  – psusi
  Jul 20 '12 at 18:42
  

  
  
  
  

add a comment | 

• Online file system growth.


• Htree indexing for larger directories

share|improve this answer

answered Jul 20 '12 at 12:48

MatteoMatteo

7,14044 gold badges4040 silver badges6060 bronze badges

share|improve this answer

answered Jul 20 '12 at 12:48

MatteoMatteo

7,14044 gold badges4040 silver badges6060 bronze badges

answered Jul 20 '12 at 12:48

MatteoMatteo

7,14044 gold badges4040 silver badges6060 bronze badges

answered Jul 20 '12 at 12:48

MatteoMatteo

7,14044 gold badges4040 silver badges6060 bronze badges