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usgsOffline
Post subject: ext4 and ext3 compatibility  PostPosted: 03.10.2010, 03:45



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In one desktop tower I'll install Aptosid using ext4. In another desktop tower I have MEPIS 8.5 installed and I use ext3 in this computer. Will I have any compatibility problems if I transfer files either way between these two computers? If there are incompatibilties between ext3 and ext4, how do I work around them in transferring files either way between the two computers?


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devilOffline
Post subject: RE: ext4 and ext3 compatibility  PostPosted: 03.10.2010, 05:23



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there is no incompatibilities. both are basically ext2 + journaling.
you could even convert ext3 to ext4.

greetz
devil
 
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DonKultOffline
Post subject: RE: ext4 and ext3 compatibility  PostPosted: 03.10.2010, 06:24
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Don't worry, even if they would be incompatible (but they are not, ext4 can read ext3 without problems for example) this doesn't make a difference for moving/copying files around.

It only makes a difference in cases like in which two different systems (e.g. aptosid and mepis) should read/write on the same partition, e.g. an usbstick. For reading/writing these systems need support for the filesystem the usbstick is formated in.

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mikekgrOffline
Post subject: Re: RE: ext4 and ext3 compatibility  PostPosted: 03.10.2010, 17:36



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      devil wrote:
there is no incompatibilities. both are basically ext2 + journaling.
you could even convert ext3 to ext4.

greetz
devil


Hello devil,
would you like to guide me how to convert my ext3 installation to ext4? Is there any drawback in this process??

Thanks and best regards
 
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x-un-i
Post subject: Re: RE: ext4 and ext3 compatibility  PostPosted: 03.10.2010, 18:23
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      mikekgr wrote:
would you like to guide me how to convert my ext3 installation to ext4? Is there any drawback in this process??


Just follow the Debian Wiki

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myloOffline
Post subject: RE: Re: RE: ext4 and ext3 compatibility  PostPosted: 03.10.2010, 21:45



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just my experience:

I have two equal hd's à 250 GB, three data partitions on each, one bears aptosid and swap additionally.

I started converting smoothly with gparted, have actually one partition per disk on ext 4, the rest is awaiting to be converted from ext 3 to 4 by time.

No probs so far!

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Linux 3.1-6.slh.1-aptosid-amd64 x86_64[2010-03 Ἀπάτη (201012262151)]
Intel Core2 Duo E6550 @ Cache/Ram 4MB/4GB nVidia G72 7300 nouveau 2*250GB
 
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mikekgrOffline
Post subject: RE: Re: RE: ext4 and ext3 compatibility  PostPosted: 04.10.2010, 10:22



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Thanks guys for the guide and the experience you have.

Best Regards
Mike Kranidis
 
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broweOffline
Post subject: RE: Re: RE: ext4 and ext3 compatibility  PostPosted: 04.10.2010, 14:22



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As everyone has said, ext3 & ext4 work fine together and preserve all file permissions. Mepis also supports ext4 and I encourage you to upgrade to it. One way to try it out without commiting to ext4 is to edit /etc/fstab and replace ext3 with ext4 (edit the file then force a reboot with filesystem check).

      Code:

# pico /etc/fstab
# touch /forcefsck
# shutdown -r now


I used this method on my machine and it worked flawlessly. This allows you to test it and if there are any issues change it back to ext3. See this article for more info:

http://wiki.archlinux.org/index.php/Ext4
 
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LanziOffline
Post subject: RE: Re: RE: ext4 and ext3 compatibility  PostPosted: 04.10.2010, 14:34



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also very positive feedback from me.
ext4 is running here since January. No problems at all.

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