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Old 7th July 2008
abdo88 abdo88 is offline
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Default Resizing /usr

Hey all

My current situation is as follows:

windows 20GB
free 20GB
FreeBSD 7.XXGB
-- / 500MB
-- /tmp 300MB
-- /usr 6GB
-- /var 500MB
Ubuntu 30GB

As the title suggests, I want to resize my /usr partition to occupy the free 20GB.

Please note:

1) I have no other drive to backup FreeBSD to
2) I am not connected to any other machine to which I can send the data
3) This is my laptop, and I'm willing to experiment anything that may lead to loss of data, as long as it might work
4) I am NOT willing to reinstall, I have just built too much from source and it has taken a long time..
5) I'm kinda new to FreeBSD...

I've searched around for a while, but found nothing interested..

Any help?

Thanks

Last edited by abdo88; 7th July 2008 at 04:12 PM. Reason: Adding partitions in FreeBSD slice
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Old 7th July 2008
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Why would you like to resize /usr
Why not to use free space to create /home ?

p.s. I'm new to freebsd as well, but i don't think you can resize drive without using another drive to backup data....
Otherwise
you could use dump and restore (haven't tried to use it for resizing, but i think it should work)
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Old 7th July 2008
abdo88 abdo88 is offline
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Thanks for the reply... From your reply, you probably work on Linux... I'm not having any problem with home... However, my major concern is with /usr (this is where all the action goes on...) especially that I'm intending to build X and KDE..

About dumping, dump to where? I have no other hard disks and no network connections...
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Old 7th July 2008
abdo88 abdo88 is offline
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Default Easier problem...

OK, here is an easier problem.... If I archive /etc, /boot and /usr and burn the archives to CDs/DVDs... If I reinstall and paste these back, will my exact same system be back the way it was??

Last edited by abdo88; 7th July 2008 at 05:27 PM.
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Old 7th July 2008
richardpl richardpl is offline
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You can use geom(8) gconcat(8) utility for adding aditional free space to /usr label.

Explore GEOM and its modules for more information.

Note that philosophy is different than what is currently provided in other alternative operating systems.
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Old 7th July 2008
abdo88 abdo88 is offline
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Was that a reply to my first or second question ?

In either case, could you please elaborate a bit more?
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Old 7th July 2008
richardpl richardpl is offline
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For your first question, second one is dumb.

Read both manual pages, provided as link in my previous post. Than read other manual pages listed in SEE ALSO in every manual page.
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Old 7th July 2008
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Quote:
Originally Posted by abdo88 View Post
Thanks for the reply... From your reply, you probably work on Linux... I'm not having any problem with home... However, my major concern is with /usr (this is where all the action goes on...) especially that I'm intending to build X and KDE..

In situation like this I move /usr/ports (and if necessary /var/tmp) to /home and make symbolic link to them...
This is how i compiled OpenOffice on my PC
After that i move them back

/ 512M
/tmp 512M
/usr 12GB (ain't enough to compile OpenOffice, only 5.3GB is free)
/var 3GB

Note that if you do like i did, then later recompiling some other apps, make sure to remove work (or what was the correct name) directory, otherwise there will be problems during compilation

Last edited by graudeejs; 7th July 2008 at 06:29 PM.
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Old 7th July 2008
abdo88 abdo88 is offline
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That's actually quite a nice idea!! It never occurred to me... So one more question how do I enlarge the FreeBSD slice (partition magic et al. won't recognize it)?

Last edited by abdo88; 7th July 2008 at 06:45 PM.
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Old 7th July 2008
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How much you free space you got on Ubuntu drive????
If it's enough, you could use it to store /usr backup...
you will need 1 to 6 GB free space (depends if you will or not compress backup).... hmm, but restore works only on UFS, so you might need to use tar, but that might make some problems (with links maybe, idk, read man tar)

Last edited by graudeejs; 7th July 2008 at 06:36 PM.
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Old 7th July 2008
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*My Personal Opinion*

Use the free 20GB to create a new slice with several partitions, where ever your 'bulges' will be and mount them or create a big slice/1partition and symlink them from a diff mount point.


It is less trouble then relabing the disk and having to go through updating stuff, especially since you have so little backup options and extra disk space available for it.



e.g.

freespace -> ad0sX
ad0sXa -> /usr/local
ad0sXb -> /usr/src
ad0sXd -> /usr/obj
ad0sXe -> /usr/ports

or

ad0sXa -> /where/ever

and create sym links to /usr/{obj,src,ports,local} to /where/ever/{obj,src,ports,local}.




For example, my file server recently got a second hard drive.


I dumped the contents of /usr/local, deleted the old, formated a slice with a partitioin for it and mounted it on /usr/local and then restored the files.
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Old 7th July 2008
abdo88 abdo88 is offline
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Default Great idea! Thanks

Thanks a lot! This seems so far like the (almost) optimal solution...

However, I have 2 questions in mind:

1) Can I change the partition mounted as /usr ?
2) If yes, can the new /usr partition be on a different slice?

If the answer to the above 2 is yes, I am thinking of making the 20GB free space into a /usr and using the 6 for smthg else (e.g. /home)...

EDIT: that is make the 20GB another 1-slice partition..
EDIT: in case this works, will it hurt the performance? if yes, to what extent?

Last edited by abdo88; 7th July 2008 at 11:37 PM.
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Old 8th July 2008
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yeah as long as you update the /etc/fstab file correctly.


basically some thing like this would *probably* work:

Code:
# fdisk ad0
   ... use fdisk to create the partition from the free space, hence forth called ad0sX
# bsdlabel -e ad0sXa
     ... create the disk label for the new slice
# newfs /dev/ad0sXa
# mount /dev/ad0sXa /mnt
# tar -cf - -C /usr . | tar -xvpf - -C /mnt
   ... copies files over
vi /etc/fstab
   ... change the device being mounted on /usr
   ... if you have a preferred screen editor instead of vi, feel free to use it
reboot
if the free space partition is ad0s2a (ad0sXa in the above) and your old /usr partition is ad0s3e you would change the ad0s3e to ad0s2a in your /etc/fstab file.

Code:
# mount /dev/ad0sYz /mnt
   .. where ad0sYz was your old /usr partition (e.g. ad0s3e in the above)
# rm -rvf /mnt/*
and do whatever you want with the old partition.



It's not exactly how I would do it but close enough. The reason for the reboot is because you may have programs stored in /usr that are running while doing this and it is best not to delete the data files while running the programs! Rebooting is not necessary but, you could say makes the process simpler to follow without bringing the system to single user mode (which would generally be best imho).



Note: I have not used FreeBSDs 'bsdlabel' in ages and of course assume no responsibility for the accuracy or inaccuracy of any of this.


If your not familiar with using bsdlabel you can always use the -n switch to it which will do a 'dry run' that won't *actually* write changes out, e.g. bsdlabel -ne ad0
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Last edited by TerryP; 8th July 2008 at 12:18 AM.
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Old 8th July 2008
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Thanks a lot for the help... Unfortunately, I had to just give up and reinstall BSD... since I cannot create more than 4 primary slices :S...

Anyways, thanks a lot to all those who helped...
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Old 12th July 2008
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Just for record

I just found this in FreeBSD handbook by accident...
  • Important: FreeBSD features the growfs(8) command, which makes it possible to increase the size of file system on the fly, removing this limitation.
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Old 12th July 2008
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Quote:
Originally Posted by richardpl View Post
You can use geom(8) gconcat(8) utility for adding aditional free space to /usr label.

Explore GEOM and its modules for more information.

Note that philosophy is different than what is currently provided in other alternative operating systems.
That's the answer. Making symbolic links is just a way of getting around a possible persisting problem.
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