Question about vgsplit and vgmerge

[dark-sun]

Hello,
I just try (for testing) a vgsplit and vgmerge.
I split the lvol4.
vgdisplay -v show me a lvol4 and lvol4b

After fsck lvol4b is mountable, OK.

Than I try a worse case, f.e. lvol4 will be bad.
So I have to use the saved/splittet data from lvol4b =>
# lvmerge /dev/vg00/lvol4 /dev/vg00/lvol4b

Logical volume "/dev/vg00/lvol4" has been successfully merged
with logical volume "/dev/vg00/lvol4b".
Logical volume "/dev/vg00/lvol4" has been successfully removed.
Warning: Can not determine all Physical Volumes on which mirrored copies of
the Logical Volume are located. "/etc/lvmtab" is missing Physical Volumes.
Volume Group configuration for /dev/vg00 has been saved in /etc/lvmconf/vg00.conf
----------
# lvdisplay -v /dev/vg00/lvol4
lvdisplay: "/dev/vg00/lvol4": No such file or directory
-----------
# lvdisplay -v /dev/vg00/lvol4b
--- Logical volumes ---
LV Name /dev/vg00/lvol4b
VG Name /dev/vg00
LV Permission read/write
LV Status available/syncd
Mirror copies 1
Consistency Recovery MWC
Schedule parallel
LV Size (Mbytes) 24
Current LE 3
Allocated PE 6
Stripes 0
Stripe Size (Kbytes) 0
Bad block on
Allocation strict
IO Timeout (Seconds) default

--- Distribution of logical volume ---
PV Name LE on PV PE on PV
/dev/dsk/c2t2d0 3 3
/dev/dsk/c1t2d0 3 3

--- Logical extents ---
LE PV1 PE1 Status 1 PV2 PE2 Status 2
00000 /dev/dsk/c2t2d0 00319 current /dev/dsk/c1t2d0 00319 current
00001 /dev/dsk/c2t2d0 00320 current /dev/dsk/c1t2d0 00320 current
...
----------------------

Whats wrong?
Why "/etc/lvmtab is missing Physical Volumes"?
lvmtab seems OK, shows to devices (c1+c2)
How can I restore (working) lvol4b into lvol4, so I have at the end a lvol4 and no lvol4b in the VG?

Michael

[RK_7]

Hi Michael,

The command used to merge lv is different.
You should use like this..

lvmerge /dev/vg00/lvol4b /dev/vg00/lvol4

Now the data in lvol4 will get mirrored to lvol4b and only lvol4 will be present.

Rgds,

[dark-sun]

Hello RK,
lvol4b is the good one and lvol4 is the "bad" one,

Your syntax will copy lvol4 (bad) into lvol4b (good).
But you are right, than I have a lvol4 (but with bad data ;-)

I found out, that I can umount the FS and use move the lvol and rlvol to a new name!

But how can I fix the error-messages:
"Warning: Can not determine all Physical Volumes on which mirrored copies of
the Logical Volume are located. /etc/lvmtab is missing Physical Volumes."

[IT_2007]

move /etc/lvmtab to /tmp and do vgscan -av to recreate new lvmtab.