system-config-lvm

anilbh · 08-17-2006, 12:37 PM

I had an unused partition /dev/hdb3 of about 7 gb .

I wanted to learn a bit about LVM .
Is system-config-lvm ALL that is required to have LVM functioning .
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I initialized it and also added it to the volgroup .

One item does not seem to work, it refers to extents . When you click on remove extents it says 'select some first before removing ' . Now there is no provision for selecting extents. It shows 238 unused extents for the new /dev/hdb3 partition .
More ...
The logical view shows a red cyclinder and blue cylinde . Clicking on them shows stripes and the number of extents.. However I cant find a way of selecting extents.

Also there is no indication which file will be written there . What if I decide to remove this from th e volume group later ?

acid_kewpie · 08-17-2006, 01:48 PM

system-config-lvm is just a gui, everything it does is done via shelling out to real tools, e.g. pvcreate, lvextend etc... i'm not really sure what you're trying to ask here... is it just an oddity you're seeing in an annoying gui tool? personally i'd say there's nothing better than understanding LVM correctly in the first place and using the real tools. additionally no "ile" is written to, LVM has no config file, it's all held on the partitions itself.

anilbh · 08-17-2006, 09:45 PM

Quote:

Originally Posted by acid_kewpie

system-config-lvm is just a gui, everything it does is done via shelling out to real tools, e.g. pvcreate, lvextend etc... i'm not really sure what you're trying to ask here... is it just an oddity you're seeing in an annoying gui tool? personally i'd say there's nothing better than understanding LVM correctly in the first place and using the real tools. additionally no "ile" is written to, LVM has no config file, it's all held on the partitions itself.

I agree with you . However I did think the GUI did make things very simple . But for a newbie it did not help much . Since there is no help and comments anywhere . I will look up the command line instructions.
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One specific question I would appreciate an answer to .
Supposing something does get written to the new Volume . After that is it possible to remove it from the main group ?

acid_kewpie · 08-18-2006, 02:47 AM

something gets written? what does that mean? what is the "main group"?

anilbh · 08-18-2006, 08:11 AM

By Main group I mean VolGroup00. And by Volume I meant the new partition I added . Now since this is all one Volume . How does one know how much is written on the the added volume ? Not necessary but if it is merely mounted as say /mnt/hdb3 then it is easy to see the files on that drive ...
The object of learning about this is to judge if there is a real benefit of this in the home environment . If it can just minimize the periodic reinstallation , that would be good enough ..

anilbh · 08-18-2006, 08:14 AM

I am hardly an expert in this so do ignore if I dont get all the terms right .

acid_kewpie · 08-18-2006, 09:20 AM

erm, ok... once you hav a volume in a volume group then you can think of it just like a real physical partition. you can't see how much of it is used, same as for a real partition. i get the idea that i'm not understanding that question, but can't see what you really mean if that's the case.

anilbh · 08-18-2006, 09:43 PM

I used webmin and went to the LVM section .

This is what I dont understand . There is something called a VolGroup, A Physical Volume , and then a Logical volume . The partition I added is there in the physical volume. It is also shown incorporated in the Volume Group . That is a total of about 13 gb . But it is NOT added to the Logical Volume group .

There is also a message that no new volume can be added as the Volume group is currently in use . Do I need to read an entire book to get this working ?

I am NOT new to Linux but I am certainly new to LVM .
During boot up there is a message which recognizes the /boot volume group but not this.