Marcus Claesson wrote:
> Hi all,
>
> I want to allocate 140G of the free space in my VG and use it to
> extend /var (/dev/Volume00/LogVol01) from 97G to 240G. After I
> unmounted /var (which was impossible until I used a lazy 'umount -
> l /var'), I ran
>
> # lvextend -L 240G /dev/Volume00/LogVol01
> (unfortunately I was in single-user mode and wasn't able to save the
> output, but it basically said 'extension successful). I then re-
> mounted /var:
>
> # mount /dev/mapper/Volume00-LogVol01 /var/
> kjournald starting. Commit interval 5 seconds
> EXT3 FS on dm-2, internal journal
> EXT3-fs: mounted filesystem with ordered data mode.
>
> and ran a df to check:
>
> # df -h
> Filesystem Size Used Avail Use% Mounted on
> /dev/cciss/c0d0p2 49G 19G 27G 42% /
> /dev/cciss/c0d0p1 99M 9.8M 84M 11% /boot
> /dev/mapper/Volume00-LogVol00
> 97G 84G 8.1G 92% /home
> none 2.9G 0 2.9G 0% /dev/shm
> /dev/mapper/Volume00-LogVol02
> 20G 11G 8.4G 56% /usr/local
> sunrpc 97G 88G 3.6G 97% /var/lib/nfs/rpc_pipefs
> /dev/mapper/Volume00-LogVol01
> 97G 88G 3.6G 97% /var
>
> To my surprise /var hadn't been extended at all and a new sunrpc device
> had also been mounted! The lvm info is now:
>
> # vgdisplay
> --- Volume group ---
> VG Name Volume00
> System ID localhost.localdomain1077884666
> Format lvm1
> VG Access read/write
> VG Status resizable
> MAX LV 256
> Cur LV 3
> Open LV 3
> Max PV 256
> Cur PV 1
> Act PV 1
> VG Size 496.02 GB
> PE Size 4.00 MB
> Total PE 126981
> Alloc PE / Size 91560 / 357.66 GB
> Free PE / Size 35421 / 138.36 GB
> VG UUID H0hRDH-Ud2L-fYSG-j1mE-3QfB-5xMo-3Sb6Mf
>
> Thus 240G has been used up.
>
> # lvdisplay
> --- Logical volume ---
> LV Name /dev/Volume00/LogVol01
> VG Name Volume00
> LV UUID 000000-0000-0000-0000-0000-0000-000002
> LV Write Access read/write
> LV Status available
> # open 1
> LV Size 240.00 GB
> Current LE 61440
> Segments 1
> Allocation normal
> Read ahead sectors 10000
> Block device 253:2
>
> Thus new size as it should be.
>
> Also, the difference between the current and old VG is:
> # diff /etc/lvm/backup/Volume00 /etc/lvm/archive/Volume00_00004.vg
> 1c1
> < # Generated by LVM2: Tue May 16 12:27:42 2006
> ---
>> # Generated by LVM2: Tue May 16 12:24:15 2006
> 6c6
> < description = "Created *after* executing 'vgdisplay'"
> ---
>> description = "Created *before* executing 'lvextend -L 240G -
> v /dev/Volume00/LogVol01'"
> 9c9
> < creation_time = 1147778862 # Tue May 16 12:27:42 2006
> ---
>> creation_time = 1147778655 # Tue May 16 12:24:15 2006
> 83c83
> < extent_count = 61440 # 240 Gigabytes
> ---
>> extent_count = 25000 # 97.6562
> Gigabytes
>
> The whole new /etc/lvm/backup/Volume00 is
>
> # cat /etc/lvm/backup/Volume00
> # Generated by LVM2: Tue May 16 12:27:42 2006
>
> contents = "Text Format Volume Group"
> version = 1
>
> description = "Created *after* executing 'vgdisplay'"
>
> creation_host = "neo.ucc.ie" # Linux neo.ucc.ie 2.6.9-34.ELsmp #1 SMP
> Fri Feb 24 16:54:53 EST 2006 i686
> creation_time = 1147778862 # Tue May 16 12:27:42 2006
>
> Volume00 {
> id = "H0hRDH-Ud2L-fYSG-j1mE-3QfB-5xMo-3Sb6Mf"
> seqno = 0
> status = ["RESIZEABLE", "READ", "WRITE"]
> system_id = "localhost.localdomain1077884666"
> extent_size = 8192 # 4 Megabytes
> max_lv = 256
> max_pv = 256
>
> physical_volumes {
>
> pv0 {
> id = "xXbxiu-uog2-xSRe-dI2z-y2ZQ-9weE-ftY6YL"
> device = "/dev/cciss/c0d0p5" # Hint only
>
> status = ["ALLOCATABLE"]
> pe_start = 9472
> pe_count = 126981 # 496.02 Gigabytes
> }
> }
>
> logical_volumes {
>
> LogVol00 {
> id = "000000-0000-0000-0000-0000-0000-000000"
> status = ["READ", "WRITE", "VISIBLE"]
> allocation_policy = "normal"
> read_ahead = 10000
> segment_count = 1
>
> segment1 {
> start_extent = 0
> extent_count = 25000 # 97.6562
> Gigabytes
>
> type = "striped"
> stripe_count = 1 # linear
>
> stripes = [
> "pv0", 0
> ]
> }
> }
>
> LogVol02 {
> id = "000000-0000-0000-0000-0000-0000-000001"
> status = ["READ", "WRITE", "VISIBLE"]
> allocation_policy = "normal"
> read_ahead = 10000
> segment_count = 1
>
> segment1 {
> start_extent = 0
> extent_count = 5120 # 20 Gigabytes
>
> type = "striped"
> stripe_count = 1 # linear
>
> stripes = [
> "pv0", 25000
> ]
> }
> }
>
> LogVol01 {
> id = "000000-0000-0000-0000-0000-0000-000002"
> status = ["READ", "WRITE", "VISIBLE"]
> allocation_policy = "normal"
> read_ahead = 10000
> segment_count = 1
>
> segment1 {
> start_extent = 0
> extent_count = 61440 # 240 Gigabytes
>
> type = "striped"
> stripe_count = 1 # linear
>
> stripes = [
> "pv0", 50000
> ]
> }
> }
> }
> }
>
>
>
> How come the size extension didn't go through?
>
> Any hints are much appreciated!
It has been extended, you need to extend the filesystem too:
See the LVM HOWTO at
http://www.tldp.org/HOWTO/LVM-HOWTO/extendlv.html
--
patrick
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