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Old 02-11-2006, 10:22 AM   #1
digatle
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Registered: Feb 2006
Posts: 2

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Resize Partition


I'm new to CentOS and used the defaults pretty much all the way. But now I'm needing a relatively small partition (1 gig or so) and I want to take it from my huge 16 gig / system. Here's my info:

lvscan:
ACTIVE '/dev/VolGroup00/LogVol00' [15.34 GB] inherit
ACTIVE '/dev/VolGroup00/LogVol01' [512.00 MB] inherit

lvm vgscan reveals that VolGroup00 is using metadata type lvm2.

fdisk -l shows the following:

Device B S END BLOCKS Id System
/dev/hda1 * 1 13 104391 83 Linux
/dev/hda2 14 2088 16667437+ 8e Linux

Now I've already tried to use systemrescuecd but when I look at my large partition that I want to resize it doesn't recognize it as anything. Like it isn't even formatted.

Am I missing something here?
 
Old 02-11-2006, 08:03 PM   #2
haertig
Senior Member
 
Registered: Nov 2004
Distribution: Debian, Ubuntu, LinuxMint, Slackware, SysrescueCD, Raspbian
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You are dealing with "partitions" and "logical volumes" here. Before recommending anything I want to make sure you know the difference. I can't tell for sure if you know this by your questions. No offense intended ... I just don't want to send you down the wrong path by making an assumption.

---

Your disk has two partitions, one that's 100Mb and one that's 16Gb. The larger one is an LVM physical volume, type 8e. The smaller one is Linux native (ext2, ext3, reiser, etc.), type 83.

That 16Gb partition is divided up into two logical volumes, one that's 512Mb and on that's 15.34Gb.

Just judging by sizes, my guess is that hda1 is mounted as /boot, LogVol01 is mounted as /swap, and LogVol00 is mounted as /

If all the above is not 100% understandable, it would be best to tell us exactly what you plan to use that 1Gb new space for, and also provide the output from the following commands:
Code:
# fdisk -l
# mount
# df
# pvdisplay
# vgdisplay
# lvdisplay
---

If the above is all obvious to you and you already understand LVM, then the answer to your original question on how to make a new 1Gb partition would be: (1) reduce the filesystem on the larger LV, then (2) reduce your larger LV, then (3) reduce your VG, then (4) reduce the partition containing the VG, then (5) create your new partition.

It's considerably simpler if you only want a new 1Gb logical volume. Steps (1) and (2) as above, then (3) create a new LV.
 
Old 02-11-2006, 08:20 PM   #3
digatle
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Registered: Feb 2006
Posts: 2

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I cheated. It was so early in the build I rebuilt it. It turned out to be faster than a reply. Thank you however for all of your information!
 
  


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