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Migrate from ext3 to jfs on root.

Installation - May 20 2010
Question:I have my root partition with ext3. But I've some power troubles and every time after sudden power lost it is bad fs consistency. I decided to set up my root on jfs partition.
I can back up all the data on it and reformat ext3->jfs. But restore as copying files back is bad way:(
Can anyone help with converting partition from ext3 to jfs?
I've done the same with my home, but that was easy just for one user home-folder...

Migrate from ext3 to jfs on root.  

Answer:Not sure what the problem with ext3 is because ext3 is a journaling filesystem. (It is essentially an ext2 system with journal.) Try reading 'man tune2fs' and look for the -j switch.

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 ext4 to xfs

 by mikejames183 on: May 31 2010
Score 50%

is it posible to change my root ext4 filesystem to XFS with out losing data?

wort wort wort!
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 Re: ext4 to xfs

 by Karmel on: Jun 17 2010
Score 50%

Simply answer without long explanation: NOT GOOD IDEA (and execution ;).


XFS is designed to handling really big files like multimedia. To achieve full potential in Linux, XFS needs additional ground sections settings.

XFS was created for very well-designed SGI machines, where power supplies and motherboards + supervision of the SGI operating system provide additional milliseconds for correct response of all system to the disappearance of power current.

On usual PC with XFS, UPS is mandatory.

If not, each hard system restart will reset end of opened (before moment of hard restart) and not saved file.

Cohesion of XFS will be correct, but you probably will lose some of not saved data.

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 RE: "Migrate from ext3 to jfs"

 by Karmel on: Jun 17 2010
Score 50%

Hi, you can't convert ext3 to jfs like from ext2 to ext3. You have to create new file system, and for first - you can enable full journaling mode (data + metadata) on your ext3 partition, for second - you can simply disable HDD cache.

Each HDD have some cache space ~ few MB - like buffer, for "smoother" HDD behavior.

HDD cache is totally invisible for disc file system - no matter what operational system or file system you actually have (Linux ext family, jfs, xfs etc.) on your machine.

If system take unclear restart when some data are transported from RAM to HDD, then HDD cache will be automatically wiped... with few MB of data. Not good... may create FS consistency problems, especially for XFS 8)

If you disable HDD cache, then file system will have direct access to HDD space - little less HDD performance (according to HDD cache enabled) but this is more safe option.

I suggest to enable ext3 full journaling mode & disable HDD cache.

Anyway, you have to check S.M.A.R.T. reports. Your HDD probably have to many bad blocks, much more then has been allocated by HDD manufacturer (about several dozen) for invisible HDD behavior (file system check don't report any problem). Above this value HDD report problems to file system.

Even if HDD have 1 bad block, you have to be very carefully with this HDD.

For enable ext3 full journal mode, necessarily unmount that partition.
For operation, you can use typical Linux LiveCD. In terminal, from su or sudo (generally as root) run:

tune2fs -l /dev/xxx

You will see file system status.

Then run:

tune2fs -o journal_data /dev/xxx

"xxx" - sda or hda with partition number - like: /dev/sda1

Check changes:

tune2fs -l /dev/xxx

Then simply restart machine and boot system from this HDD.

You can back to default, ordered journaling mode by running this:

tune2fs -o journal_data_ordered /dev/xxx

For disabling HDD cache, on running system (yes, here you can do that) run as root:

hdparm -W0 /dev/xxx

Check result:

hdparm -I /dev/xxx

You will see something like "cache disabled".

You can create file in "/etc/init.d" directory, name it as you like, maybe: disabling-sda-cache

this file must contain:

#! /bin/sh
echo "Disabling cache of /dev/xxx..."
hdparm -W0 /dev/xxx
echo "Cache of /dev/xxx is disabled."

Then as root run in terminal:

update-rc.d disabling-sda-cache defaults

After that, that script will run and will disable HDD cache after each system start.

Manual file is very helpful:
man hdparm

JFS is very good, but first you have to find problems source - probably something going on with HDD.



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