[linux-lvm] Problems activating VG (2.4.0-test1 / raid 0.9)

[stk at rmi.de]

Hello everyone,

at the moment im experimenting with lvm on top of raid1 (v0.9)
but ran into a problem with the pv and vg activation. That is
that I'm able to create md0, a pv on md0 a vg in that pv and
some lv's in the vg, also no problem with making (reiser) 
filesystems in the logical volumes. But after a vgchange -a n 
it is not possible to activate the vg again. pvchange -a y 
exits with errorcode 0 (wich should be fine) but a vgdisplay -D
will always report the vg (or pv) as inactive. Nethertheless vgscan 
is still detecting the volume group.

Any ideas on this? I have read the documentation and faq, butI may 
have overlooked something, have I ?

Hopefully someone can comment on this, attached are (some) of the 
details, if needed i will provide even more of them :)

thanx in advance
Stefan


Now here are the details:

Linux 2.4.0-test1 (with reiserfs patch)
raidtools 0.9
lvm_0.8final (+ patch2)


[root at host42 /etc]# pvcreate /dev/md0 -ff
pvcreate -- really INITIALIZE physical volume "/dev/md0" of volume group "vg01" [y/n]? y
pvcreate -- WARNING: forcing physical volume creation on "/dev/md0" of volume group "vg01"
pvcreate -- removing lvmtab entry
pvcreate -- physical volume "/dev/md0" successfully created

[root at host42 /etc]# vgscan
vgscan -- reading all physical volumes (this may take a while...)
vgscan -- no volume groups found

[root at host42 /etc]# vgcreate vg01 /dev/md0
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 "vg01"
vgcreate -- volume group "vg01" successfully created and activated

[root at host42 /etc]# vgdisplay 
--- Volume group ---
VG Name               vg01
VG Access             read/write
VG Status             available/resizable
VG #                  0
MAX LV                256
Cur LV                0
Open LV               0
MAX LV Size           255.99 GB
Max PV                256
Cur PV                1
Act PV                1
VG Size               18.45 GB
PE Size               4 MB
Total PE              4724
Alloc PE / Size       0 / 0
Free  PE / Size       4724 / 18.45 GB


[root at host42 /etc]# cat /proc/lvm 
LVM module version 0.8final  (15/02/2000)

Total:  1 VG  1 PV  0 LVs (0 LVs open)
Global: 3089 bytes malloced   IOP version: 6   0:01:43 active

VG:  vg01  [1 PV, 0 LV/0 open]  PE Size: 4096 KB
  Usage [KB/PE]: 19349504 /4724 total  0 /0 used  19349504 /4724 free
  PV:  [AA] md0                   19349504 /4724           0 /0       19349504 /4724  
    LVs: none

[root at host42 /root]# vgchange -a n 
vgchange -- volume group "vg01" successfully deactivated

[root at host42 /root]#  cat /proc/mdstat 
Personalities : [raid1] 
read_ahead 1024 sectors
md0 : active raid1 hdc3[1] hda3[0]
      19350208 blocks [2/2] [UU]
      
unused devices: <none>

[root at host42 /root]# vgscan
vgscan -- reading all physical volumes (this may take a while...)
vgscan -- found inactive volume group "vg01"
vgscan -- "/etc/lvmtab" and "/etc/lvmtab.d" successfully created
vgscan -- WARNING: you may not have an actual VGDA backup of your volume group

[root at host42 /root]# cat /proc/lvm 
LVM module version 0.8final  (15/02/2000)

Total:  0 VGs  0 PVs  0 LVs (0 LVs open)
Global: 143 bytes malloced   IOP version: 6   0:00:19 active


[root at host42 /root]# vgchange -a y

[root at host42 /root]# echo $?
0

[root at host42 /root]# cat /proc/lvm 
LVM module version 0.8final  (15/02/2000)

Total:  0 VGs  0 PVs  0 LVs (0 LVs open)
Global: 143 bytes malloced   IOP version: 6   0:02:58 active

[root at host42 /root]# vgdisplay -D
--- Volume group ---
VG Name               vg01
VG Access             read/write
VG Status             NOT available/resizable
VG #                  0
MAX LV                256
Cur LV                0
Open LV               0
MAX LV Size           255.99 GB
Max PV                256
Cur PV                1
Act PV                1
VG Size               18.45 GB
PE Size               4 MB
Total PE              4724
Alloc PE / Size       0 / 0
Free  PE / Size       4724 / 18.45 GB


[root at host42 /root]# pvdisplay /dev/md0
--- Physical volume ---
PV Name               /dev/md0
VG Name               vg01
PV Size               18.45 GB / NOT usable 704 KB [LVM: 197 KB]
PV#                   1
PV Status             NOT available
Allocatable           yes
Cur LV                0
PE Size (KByte)       4096
Total PE              4724
Free PE               4724
Allocated PE          0



-- 
 Stefan K                                       email:     stk at rmi.de
 Aix-la-Chapelle                                fax/data: +49-241-533353