I read the How-To. It doesn't talk about the specific case or being mounted at root, so I had to experiment. It is likely that commands were in the wrong order, but I don't know what the right order is.
I have attached the terminal session I used. In the end it did not work. There was still 66 GB free, and when I rebooted, the file system failed. The superblock was too big.
I obviously don't understand the difference between pvresize, lvreduce and vgreduce, and how resize2fs is related to these commands.
Hope you can help,
Lou.
On 10/21/09, Drew <drew.kay@gmail.com> wrote:
> The documentation wasn't specific. I believe the intent was simply to
> migrate the data to another logical volume to temporarily allow the source
> volume to be reduced and/or removed. But let's assume that has happened or
> that doesn't need to happen. So now we need to unmount LogVol00, reduce it
> to its original nunber of extents and then remount it (either before or
> after remount we remove the physical drive.) I assume you can't try this or
> you'll screw up your computer, but I have a system that I screw up and
> easily restore from a OS image. So no need to be too cautious.
I've done this on several occasions.
If you want to play with various scenarios in LVM, I'd recommend
reading the LVM How-To @ http://tldp.org/HOWTO/LVM-HOWTO/ . Sections
11 & 13 cover the most common tasks you'll encounter in LVM. Play
around, don't be afraid to break things, and if you have questions
feel free to give the list a shout.
--
Drew
"Nothing in life is to be feared. It is only to be understood."
--Marie Curie
[root@shoe ~]# vgdisplay
--- Volume group ---
VG Name VolGroup00
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 7
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 2
Act PV 2
VG Size 75.16 GB
PE Size 32.00 MB
Total PE 2405
Alloc PE / Size 2405 / 75.16 GB
Free PE / Size 0 / 0
VG UUID jvz6xK-OCTu-NUfb-5ssk-QHEI-KosC-PHiJff
[root@shoe ~]# pvdisplay /dev/hdd
--- Physical volume ---
PV Name /dev/hdd
VG Name VolGroup00
PV Size 38.02 GB / not usable 19.05 MB
Allocatable yes (but full)
PE Size (KByte) 32768
Total PE 1216
Free PE 0
Allocated PE 1216
PV UUID ggSPj8-N36N-dtC1-U5sL-pw23-ubGj-AdF9H3
[root@shoe ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
72G 2.2G 67G 4% /
/dev/hda1 99M 18M 76M 19% /boot
tmpfs 252M 0 252M 0% /dev/shm
[root@shoe ~]# pvdisplay -m
--- Physical volume ---
PV Name /dev/hda2
VG Name VolGroup00
PV Size 37.17 GB / not usable 12.24 MB
Allocatable yes (but full)
PE Size (KByte) 32768
Total PE 1189
Free PE 0
Allocated PE 1189
PV UUID vEuKec-0sYh-6H3u-30Ld-Aq1S-UyWN-i6vwEr
--- Physical Segments ---
Physical extent 0 to 1156:
Logical volume /dev/VolGroup00/LogVol00
Logical extents 0 to 1156
Physical extent 1157 to 1188:
Logical volume /dev/VolGroup00/LogVol01
Logical extents 0 to 31
--- Physical volume ---
PV Name /dev/hdd
VG Name VolGroup00
PV Size 38.02 GB / not usable 19.05 MB
Allocatable yes (but full)
PE Size (KByte) 32768
Total PE 1216
Free PE 0
Allocated PE 1216
PV UUID ggSPj8-N36N-dtC1-U5sL-pw23-ubGj-AdF9H3
--- Physical Segments ---
Physical extent 0 to 1215:
Logical volume /dev/VolGroup00/LogVol00
Logical extents 1157 to 2372
[root@shoe ~]# pvresize --setphysicalvolumesize 00G /dev/hdd
Physical volume "/dev/hdd" changed
1 physical volume(s) resized / 0 physical volume(s) not resized
[root@shoe ~]# pvdisplay -m
--- Physical volume ---
PV Name /dev/hda2
VG Name VolGroup00
PV Size 37.17 GB / not usable 12.24 MB
Allocatable yes (but full)
PE Size (KByte) 32768
Total PE 1189
Free PE 0
Allocated PE 1189
PV UUID vEuKec-0sYh-6H3u-30Ld-Aq1S-UyWN-i6vwEr
--- Physical Segments ---
Physical extent 0 to 1156:
Logical volume /dev/VolGroup00/LogVol00
Logical extents 0 to 1156
Physical extent 1157 to 1188:
Logical volume /dev/VolGroup00/LogVol01
Logical extents 0 to 31
--- Physical volume ---
PV Name /dev/hdd
VG Name VolGroup00
PV Size 38.02 GB / not usable 18.86 MB
Allocatable yes (but full)
PE Size (KByte) 32768
Total PE 1216
Free PE 0
Allocated PE 1216
PV UUID ggSPj8-N36N-dtC1-U5sL-pw23-ubGj-AdF9H3
--- Physical Segments ---
Physical extent 0 to 1215:
Logical volume /dev/VolGroup00/LogVol00
Logical extents 1157 to 2372
[root@shoe ~]# pvremove -ff /dev/hdd
Really WIPE LABELS from physical volume "/dev/hdd" of volume group "VolGroup00" [y/n]? y
WARNING: Wiping physical volume label from /dev/hdd of volume group "VolGroup00"
Can't open /dev/hdd exclusively - not removing. Mounted filesystem?
[root@shoe ~]# lvreduce -l -1216 /dev/mapper/VolGroup00-LogVol00
WARNING: Reducing active and open logical volume to 36.16 GB
THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce LogVol00? [y/n]: y
Reducing logical volume LogVol00 to 36.16 GB
Logical volume LogVol00 successfully resized
[root@shoe ~]# pvremove -ff /dev/hdd
Really WIPE LABELS from physical volume "/dev/hdd" of volume group "VolGroup00" [y/n]? y
WARNING: Wiping physical volume label from /dev/hdd of volume group "VolGroup00"
Labels on physical volume "/dev/hdd" successfully wiped
[root@shoe ~]# vgreduce --removemissing VolGroup00
Couldn't find device with uuid 'ggSPj8-N36N-dtC1-U5sL-pw23-ubGj-AdF9H3'.
Couldn't find device with uuid 'ggSPj8-N36N-dtC1-U5sL-pw23-ubGj-AdF9H3'.
Wrote out consistent volume group VolGroup00
--Its not clear why these messages come out. The PV is not there according to the LVM GUI.
[root@shoe ~]# vgdisplay
--- Volume group ---
VG Name VolGroup00
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 10
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 1
Act PV 1
VG Size 37.16 GB
PE Size 32.00 MB
Total PE 1189
Alloc PE / Size 1189 / 37.16 GB
Free PE / Size 0 / 0
VG UUID jvz6xK-OCTu-NUfb-5ssk-QHEI-KosC-PHiJff
[root@shoe ~]# lvdisplay
--- Logical volume ---
LV Name /dev/VolGroup00/LogVol00
VG Name VolGroup00
LV UUID Q1ygc0-I2zj-1hQU-gDAa-MdzK-tTaP-gLHzLt
LV Write Access read/write
LV Status available
# open 1
LV Size 36.16 GB
Current LE 1157
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
--- Logical volume ---
LV Name /dev/VolGroup00/LogVol01
VG Name VolGroup00
LV UUID PUGBXZ-RHX2-gdIR-kQSG-q8ct-2N1y-P555uJ
LV Write Access read/write
LV Status available
# open 1
LV Size 1.00 GB
Current LE 32
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:1
[root@shoe ~]# pvdisplay
--- Physical volume ---
PV Name /dev/hda2
VG Name VolGroup00
PV Size 37.17 GB / not usable 12.24 MB
Allocatable yes (but full)
PE Size (KByte) 32768
Total PE 1189
Free PE 0
Allocated PE 1189
PV UUID vEuKec-0sYh-6H3u-30Ld-Aq1S-UyWN-i6vwEr
[root@shoe ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
72G 2.2G 67G 4% /
/dev/hda1 99M 18M 76M 19% /boot
tmpfs 252M 0 252M 0% /dev/shm
--You can see that there is still something wrong here, because VolGroup00-LogVol00 is still marked as 67G Available and of course its not. How do we fix that.
_______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
