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Old 09-07-2009, 01:01 AM   #1
james2b
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Smile ext4 new file system mounting compatibility with the older ext3 type


How well is the ext4 new file system mounting compatibility with the older ext3 previous Linux installations ? I refer to Ubuntu 9.04 and the new Fedora 11 which have the option to install with the ext4 file format. Will it be better if I install with the older ext3, so that I will be able to mount all other Linux from each other in a multi-boot system ?
 
Old 09-07-2009, 01:06 AM   #2
j_jerry
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fedora 11 still won't boot from ext4. The primary boot partition should be something other than ext4
 
Old 09-07-2009, 01:14 AM   #3
vishesh
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Other than boot partition, you can format other partition as ext4. There are a number of performance benefit with ext4. http://kernelnewbies.org/Ext4 list features of ext4. You can mount on other system using samba or nfs, so there is no concern of ext3 or ext4.

thnks
 
Old 09-07-2009, 01:53 AM   #4
james2b
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Unhappy

So with that new ext4 file system, the grub boot loader is unable to boot those partitions formatted as ext4 then, and from booted into ext3 Linux partitions, it is not possible to mount any ext4 partitions ? But it may be more backwards compatible, so that from ext4 I can mount ext3 ? I did see from an online search that you can convert ext3 Linux to the ext4, and not need to reinstall or lose data, correct ?
 
Old 09-07-2009, 02:11 AM   #5
j_jerry
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Quote:
Originally Posted by james2b View Post
So with that new ext4 file system, the grub boot loader is unable to boot those partitions formatted as ext4 then, and from booted into ext3 Linux partitions, it is not possible to mount any ext4 partitions ? But it may be more backwards compatible, so that from ext4 I can mount ext3 ? I did see from an online search that you can convert ext3 Linux to the ext4, and not need to reinstall or lose data, correct ?
Newer OSs support mounting ext4 except for the bootsector partition. That is you can install bootloader in an ext3 and all your data in ext4 partitions
 
Old 09-07-2009, 02:40 AM   #6
vishesh
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yes you can easily convert ext3 to ext4. and you can mount ext3 partition as well from ext4.

Even grub can support ext4 but for that you have to update grub with patch

thnks
 
Old 09-08-2009, 05:57 PM   #7
james2b
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Smile

Thanks for the help, and I did end up installing Fedora 11 as the default ext4 onto one root partition, which is on my internal IDE drive where I have the main grub located, and Ubuntu 9.04 as ext3 onto my new external SATA drive, and added it to the main grub boot menu.lst file. After some effort and several grub errors, I can now boot both new Linux from my main grub. Next I will try to mount the ext4 Fedora partition from a ext3 other Linux partition.
 
  


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