Software :: LVM - Using Physical Volume On Command Line

Jun 11, 2010

I have kind of test partition, but I need lv_root on it. So I have:

Code:
Using physical volume(s) on command line
PV VG Fmt Attr PSize PFree Start SSize LV Start Type PE Ranges /dev/sda6 VolGroup lvm2 a- 29.73g 440.00m 0 6859 lv_root 0 linear /dev/sda6:0-6858
/dev/sda6 VolGroup lvm2 a- 29.73g 440.00m 6859 128 lv_swap 0 linear /dev/sda6:6859-6986
/dev/sda6 VolGroup lvm2 a- 29.73g 440.00m 6987 512 lv_root 6859 linear /dev/sda6:6987-7498
/dev/sda6 VolGroup lvm2 a- 29.73g 440.00m 7499 2 lv_swap 128 linear /dev/sda6:7499-7500
/dev/sda6 VolGroup lvm2 a- 29.73g 440.00m 7501 110 0 free
I want to move "lv_swap" to the end of VG. I want to delete its segment, and rest of VG to use for "lv_root".

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I use F13. How can I control the volume of my desktop ssh'ing into it from my laptop?

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I was running through a fairly routine Gentoo install on a 160G hard disk. My intention was to have two partitions on the disks: one for boot, and one to be an LVM physical volume. In a stroke of absent-mindedness, however, I forgot to create the boot partition and only created the LVM physical volumend didn't realize ituntil the end of the installation.Anyway, I just want to shrink the physical volume partition and add in another partition with fdisk. However, this doesn't seem to be working the way I intend. I ran

Code:
livecd dev # pvresize --setphysicalvolumesize 159G /dev/hda1
WARNING: /dev/hda1: Overriding real size. You could lose data.

[code]....

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So I got a bad physical volume inisde my logical volume. I want to do this safely rather than tinkering around, how can I get the bad physical disk out and look at the data on the other 2 drives to see if I can save anything? Its just the standard fedora setup where it combines all the disks, nothing fancy.

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General :: LVM Removing A Physical Volume Safely

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Let's assume I have a volume group (VG) with six physical volumens (PV) - sdb1, sdb2, sdb3, sdc1, sdc2, sdc3..I want to remove one of the PVs from the group in order to use its space elsewhere - how can I know if it's safe? How can I do that without losing data and without first "pvmove"ing it elsewhere?Reading a bit more, my guess is using the result of pvscan, but I thought I'd ask before removing keeping it safe as I'm not an LVM expert.

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WHat is the physical volume in LVM's? Why do we need to create a physical volume first before creating LVM's? I mean, LVM's are created from physical disks, so why do we need to specify it? Didnt get it. Anybody want to help me with this?

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Nov 9, 2010

Maybe I'm missing something obvious but I do not see it listed in vgdisplay.

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Apr 11, 2011

I have a 500GB hard disk, /dev/sda. On it, there is /dev/sda1 for /boot, /dev/sda2 for an LVM PV (physical volume), and /dev/sda3 for another /boot (multiple Linux distros, one boot partition for grub legacy, another for grub2). so the LVM2 partition, /dev/sda2, is taking up ~465GiB. I want to add another OS (non-Linux), so I resized the *lvm2 physical volume* to 320GiB, successfully, using pvresize.

However, I now need to resize the partition so the lvm2 physical volume only just fits on it, ie to 320GiB. My plan of action is to use gparted (the partition table is GUID, so fdisk won't work), to first delete the partition from the partition table, then re-add it but this time with a smaller value (~320GiB). The problem is that I need to know exactly how many MiB/cylinders the physical volume is taking up. So, I run:

Code:

root@sysresccd /root % pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name vg0

[code]....

What one of these values do I need to set the new lvm2 replacement partition to?

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Jul 10, 2011

When I installed Ubuntu, I created an 52 gb encrypted partition which shows up in the disk utility, and in the window that opens when I click on the "home folder" icon. I get my normal windows partition, and under that the 52 GB LVM2 partition. But when I try to access it, I get this error.

Unable to mount 52 GB LVM2 Physical Volume - not a mountable file system

This is what fdisk -l shows

Device Boot Start End Blocks Id System
/dev/sda1 * 1 52 409600 27 Unknown
Partition 1 does not end on cylinder boundary.
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[Code]....

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Quote:
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Could I get 50GB from /dev/sdb1 and add it to /dev/sda1 ???

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Hi,

I am experiencing problems in creating a physical volume on RAID 1 system.

Here is what I did.

#/usr/sbin/pvcreate /dev/md0

the message reads:
"Device /dev/md0 not found (or ignored by filtering)."

The /dev/md0 has a partition type 8e for linux LVM

Can anyone enlighten me?

Thanks

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Apr 26, 2010

How to create multiple Logical Groups out of a single Physical Volume? Here is the Physical Volume I have created:

Code:
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--- Physical volume ---
PV Name /dev/sda9
VG Name myVG1
PV Size 54.88 MB / not usable 2.88 MB
Allocatable yes
PE Size (KByte) 4096
Total PE 13
Free PE 11
Allocated PE 2
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This is how I am creating a Logical Group out of the above Physical Volume:

Code:
# vgcreate myVG1 -s 4m /dev/sda9
Display:

Code:
# vgdisplay
--- Volume group ---
VG Name myVG1
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 5
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 1
Max PV 0
Cur PV 1
Act PV 1
VG Size 52.00 MB
PE Size 4.00 MB
Total PE 13
Alloc PE / Size 2 / 8.00 MB
Free PE / Size 11 / 44.00 MB
VG UUID O6ljYC-bflz-EUTd-nf34-8gYe-Fh39-Bh3cOg

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Code:
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Code:
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