Hi,
Problem Description:
====================
I am trying to migrate from environment having lvm on top of SD
to environment having lvm on top of MD and MD on top of SD device.
The migration is successful however output of pvscan and vgscan
shows that particular vg is still in inactive and exported state
Please refer attached diagram for migration details.
The migration steps that i am following are as follows for detail please
refer console logs given below :
1. Unmount logical volume
2. Deactivate volume group
3. Export volume group by command vgexport
4. Edit /etc/raidtab to have entry for MD device on top of cooresponding SD
5. Create md device using mkraid command
6. Run vgscan command
7. Vgimport on md device
8. Mount logical volume
Here pvscan and vgscan output shows vg in inactive and exported state.
However if i run following commands after step #8 the pvscan and vgscan
output is proper
9. Unmount logical volume
10. Deactivate vg
11. raidstop all md devices beneath vg
12. raidstart all md devices beneath vg
13. Activate vg
Inputs Expected:
================
1. Please let us know why pvscan and vgscan shows vg in exported and in
inactive state even though it is imported and accessible through logical
volume.
(vgdisplay -v output is proper)
2. After migration (Steps #1 to #8) if i try to run lvscan, vgchange
command it gives output as below
linux:~ # lvscan
lvscan -- ERROR: VGDA in kernel and lvmtab are NOT consistent; please run
vgscan
3. Please let us know whether the steps mentioned above are correct or not.
4. Why execution of steps #9 to #13 after step #8 solving problem.
**Please refer console logs for details of steps carried out: *****
===========================================================
linux:~ # fdisk -l /dev/sdd
Disk /dev/sdd: 255 heads, 63 sectors, 652 cylinders
Units = cylinders of 16065 * 512 bytes
Device Boot Start End Blocks Id System
/dev/sdd1 1 200 1606468+ 8e Linux LVM
/dev/sdd2 201 400 1606500 8e Linux LVM
/dev/sdd3 401 652 2024190 8e Linux LVM
linux:~ # pvcreate /dev/sdd1 /dev/sdd2 /dev/sdd3
pvcreate -- physical volume "/dev/sdd1" successfully created
pvcreate -- physical volume "/dev/sdd2" successfully created
pvcreate -- physical volume "/dev/sdd3" successfully created
linux:~ # pvscan
pvscan -- reading all physical volumes (this may take a while...)
pvscan -- inactive PV "/dev/sdd1" is in no VG [1.53 GB]
pvscan -- inactive PV "/dev/sdd2" is in no VG [1.53 GB]
pvscan -- inactive PV "/dev/sdd3" is in no VG [1.93 GB]
pvscan -- total: 3 [4.99 GB] / in use: [0] / in no VG: 3 [4.99 GB]
linux:~ # vgcreate vgtest /dev/sdd1 /dev/sdd2 /dev/sdd3
vgcreate -- INFO: using default physical extent size 4 MB
vgcreate -- INFO: maximum logical volume size is 255.99 Gigabyte
vgcreate -- doing automatic backup of volume group "vgtest"
vgcreate -- volume group "vgtest" successfully created and activated
linux:~ # vgscan
vgscan -- reading all physical volumes (this may take a while...)
vgscan -- found active volume group "vgtest"
vgscan -- "/etc/lvmtab" and "/etc/lvmtab.d" successfully created
vgscan -- WARNING: This program does not do a VGDA backup of your volume
group
linux:~ # pvscan
pvscan -- reading all physical volumes (this may take a while...)
pvscan -- ACTIVE PV "/dev/sdd1" of VG "vgtest" [1.53 GB / 1.53 GB free]
pvscan -- ACTIVE PV "/dev/sdd2" of VG "vgtest" [1.53 GB / 1.53 GB free]
pvscan -- ACTIVE PV "/dev/sdd3" of VG "vgtest" [1.93 GB / 1.93 GB free]
pvscan -- total: 3 [4.99 GB] / in use: 3 [4.99 GB] / in no VG: [0]
linux:~ # lvcreate -L 100M -n lvtest vgtest
lvcreate -- doing automatic backup of "vgtest"
lvcreate -- logical volume "/dev/vgtest/lvtest" successfully created
linux:~ # lvscan
lvscan -- ACTIVE "/dev/vgtest/lvtest" [100 MB]
lvscan -- 1 logical volumes with 100 MB total in 1 volume group
lvscan -- 1 active logical volumes
linux:~ # mke2fs /dev/vgtest/lvtest
mke2fs 1.28 (31-Aug-2002)
Filesystem labelOS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
25688 inodes, 102400 blocks
5120 blocks (5.00%) reserved for the super user
First data block=1
13 block groups
8192 blocks per group, 8192 fragments per group
1976 inodes per group
Superblock backups stored on blocks:
8193, 24577, 40961, 57345, 73729
Writing inode tables: done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 35 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
linux:~ # mount /dev/vgtest/lvtest /mnt/
linux:~ # mount
/dev/hda7 on / type ext3 (rw)
proc on /proc type proc (rw)
devpts on /dev/pts type devpts (rw,mode=0620,gid=5)
/dev/hda8 on /boot type ext3 (rw)
shmfs on /dev/shm type shm (rw)
usbdevfs on /proc/bus/usb type usbdevfs (rw)
/dev/vgtest/lvtest on /mnt type ext2 (rw)
linux:~ # touch /mnt/file
linux:~ # ls -al /mnt/
total 17
drwxr-xr-x 3 root root 1024 Oct 30 13:40 .
drwxr-xr-x 24 root root 4096 Oct 30 09:08 ..
-rw-r--r-- 1 root root Oct 30 13:40 file
drwx------ 2 root root 12288 Oct 30 13:39 lost+found
************************* MIGRATION STEPS START **************************
linux:~ # umount /mnt/
linux:~ # vgchange -a n vgtest
vgchange -- volume group "vgtest" successfully deactivated
linux:~ # vgexport vgtest
vgexport -- volume group "vgtest" sucessfully exported
linux:~ # vgscan
vgscan -- reading all physical volumes (this may take a while...)
vgscan -- found exported volume group "vgtestPV_EXP"
vgscan -- "/etc/lvmtab" and "/etc/lvmtab.d" successfully created
vgscan -- WARNING: This program does not do a VGDA backup of your volume
group
linux:~ # pvscan
pvscan -- reading all physical volumes (this may take a while...)
pvscan -- inactive PV "/dev/sdd1" is in EXPORTED VG "vgtest" [1.53 GB /
1.43 GB free]
pvscan -- inactive PV "/dev/sdd2" is in EXPORTED VG "vgtest" [1.53 GB /
1.53 GB free]
pvscan -- inactive PV "/dev/sdd3" is in EXPORTED VG "vgtest" [1.93 GB /
1.93 GB free]
pvscan -- total: 3 [4.99 GB] / in use: 3 [4.99 GB] / in no VG: [0]
linux:~ # cat /etc/raidtab
raiddev /dev/md0
raid-level linear
nr-raid-disks 1
persistent-superblock 1
chunk-size 32
device /dev/sdd1
raid-disk 0
raiddev /dev/md1
raid-level linear
nr-raid-disks 1
persistent-superblock 1
chunk-size 32
device /dev/sdd2
raid-disk 0
raiddev /dev/md2
raid-level linear
nr-raid-disks 1
persistent-superblock 1
chunk-size 32
device /dev/sdd3
raid-disk 0
linux:~ # mkraid -R /dev/md0 /dev/md1 /dev/md2
DESTROYING the contents of /dev/md0 in 5 seconds, Ctrl-C if unsure!
handling MD device /dev/md0
analyzing super-block
disk 0: /dev/sdd1, 1606468kB, raid superblock at 1606400kB
DESTROYING the contents of /dev/md1 in 5 seconds, Ctrl-C if unsure!
handling MD device /dev/md1
analyzing super-block
disk 0: /dev/sdd2, 1606500kB, raid superblock at 1606400kB
DESTROYING the contents of /dev/md2 in 5 seconds, Ctrl-C if unsure!
handling MD device /dev/md2
analyzing super-block
disk 0: /dev/sdd3, 2024190kB, raid superblock at 2024064kB
linux:~ # cat /proc/mdstat
Personalities : [linear]
read_ahead 1024 sectors
md2 : active linear sdd3[0]
2024064 blocks 32k rounding
md1 : active linear sdd2[0]
1606400 blocks 32k rounding
md0 : active linear sdd1[0]
1606400 blocks 32k rounding
unused devices: <none>
linux:~ # pvscan
pvscan -- reading all physical volumes (this may take a while...)
pvscan -- inactive PV "/dev/md0" is in EXPORTED VG "vgtest" [1.53 GB /
1.43 GB free]
pvscan -- inactive PV "/dev/md1" is in EXPORTED VG "vgtest" [1.53 GB /
1.53 GB free]
pvscan -- inactive PV "/dev/md2" is in EXPORTED VG "vgtest" [1.93 GB /
1.93 GB free]
pvscan -- total: 3 [4.99 GB] / in use: 3 [4.99 GB] / in no VG: [0]
linux:~ # vgimport vgtest /dev/md0 /dev/md1 /dev/md2
vgimport -- doing automatic backup of volume group "vgtest"
vgimport -- volume group "vgtest" successfully imported and activated
linux:~ # vgscan
vgscan -- reading all physical volumes (this may take a while...)
vgscan -- found inactive volume group "vgtestPV_EXP"
vgscan -- "/etc/lvmtab" and "/etc/lvmtab.d" successfully created
vgscan -- WARNING: This program does not do a VGDA backup of your volume
group
linux:~ # pvscan
pvscan -- reading all physical volumes (this may take a while...)
pvscan -- inactive PV "/dev/md0" is in EXPORTED VG "vgtest" [1.53 GB /
1.43 GB free]
pvscan -- inactive PV "/dev/md1" is in EXPORTED VG "vgtest" [1.53 GB /
1.53 GB free]
pvscan -- inactive PV "/dev/md2" is in EXPORTED VG "vgtest" [1.93 GB /
1.93 GB free]
pvscan -- total: 3 [4.99 GB] / in use: 3 [4.99 GB] / in no VG: [0]
linux:~ # vgdisplay -v
--- Volume group ---
VG Name vgtest
VG Access read/write
VG Status available/resizable
VG # 0
MAX LV 256
Cur LV 1
Open LV 0
MAX LV Size 255.99 GB
Max PV 256
Cur PV 3
Act PV 3
VG Size 4.98 GB
PE Size 4 MB
Total PE 1275
Alloc PE / Size 25 / 100 MB
Free PE / Size 1250 / 4.88 GB
VG UUID p63Nem-1fai-k30T-B9wQ-bD7f-3f5T-bfmyS1
--- Logical volume ---
LV Name /dev/vgtest/lvtest
VG Name vgtest
LV Write Access read/write
LV Status available
LV # 1
# open 0
LV Size 100 MB
Current LE 25
Allocated LE 25
Allocation next free
Read ahead sectors 1024
Block device 58:0
--- Physical volumes ---
PV Name (#) /dev/md0 (1)
PV Status available / allocatable
Total PE / Free PE 391 / 366
PV Name (#) /dev/md1 (2)
PV Status available / allocatable
Total PE / Free PE 391 / 391
PV Name (#) /dev/md2 (3)
PV Status available / allocatable
Total PE / Free PE 493 / 493
linux:~ # vgchange -a y vgtest
vgchange -- ERROR: VGDA in kernel and lvmtab are NOT consistent; please
run vgscan
linux:~ # vgchange -a n vgtest
vgchange -- ERROR: VGDA in kernel and lvmtab are NOT consistent; please
run vgscan
linux:~ # lvscan
lvscan -- ERROR: VGDA in kernel and lvmtab are NOT consistent; please run
vgscan
linux:~ # vgscan
vgscan -- reading all physical volumes (this may take a while...)
vgscan -- found inactive volume group "vgtestPV_EXP"
vgscan -- "/etc/lvmtab" and "/etc/lvmtab.d" successfully created
vgscan -- WARNING: This program does not do a VGDA backup of your volume
group
linux:~ # lvscan
lvscan -- ERROR: VGDA in kernel and lvmtab are NOT consistent; please run
vgscan
==================================================================
Thanks in advance.
Thanks & Regards,
Santosh RokadeAttachment:
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