Unable to add new disk to one VG, but able to add to other VG

[Madhu_17]

Hi,

There was a bad disk in our server. Vendor has replaced the bad disk. When i try to add the new disk to the existing VG. i'm getting i/o error 'n' the new disk is showing as stale in lvdisplay.

But the same disk i could able to add to other VG successfully.

Can anybody suggest me?

Thanks,
Madhu

[Stf]

Hello,

Do a pvcreate -f on your new disk before adding it in the VG

could you send the exact error message please?

Stf ;-)

[RAC_1]

Shouldn't you add the disk to the VG it belonged to?? If it was not part of any VG, you can do pvcreate on it and add it to any VG you want. If disk belonged to a VG, after replacement, just do vgcfgrestore -n /dev/vgxx /dev/dsk/cxtxdx and do a vgsync

Anil

[Madhu_17]

I tried all these options.

i'm trying to add to the same old VG. but i've removed the entry related to this bad disk before the hdd replacement.

i'm getting the below error when i try to extend LV.

#lvextend -m 1 /dev/vg02/u02
The newly allocated mirrors are now being synchronized. This operation will
take some time. Please wait ....
lvextend: Couldn't re-synchronize stale partitions of the logical volume: I/O error
lvextend: Couldn't resynchronize logical volume "/dev/vg02/u02".

Initially i suspected disk problem. But i could able to add the same disk to other VG successfully.

Any expert suggetions???

[Stf]

What is the result of the command:

# lvdisplay -v /dev/vg02/u02

Stf

[Madhu_17]

lvdisplay is showing stale partitions for fully.
other disk(mirror copy) is showing current.

[Stf]

OK you have to do an

# lvreduce -m 0 /dev/vg02/u02
and then you can do an

# lvextend -m 1 /dev/vg02/u02

Stf ;-)

[Madhu_17]

stf,

i tried all those options. looks like VG is corrupted.

Can you pls suggest me some high funda commands.

[Fred Ruffet]

And what is output for pvdisplay on your new disk ?

Regards,

Fred

[Madhu_17]

right now i've detached the problematic disk from mirror. i think it was showing that this disk was related to vg02 VG

[Stf]

OK did your new disk have the same special files (/dev/dsk/cxtxdx) that the bad you have replaced?

If this is the case :

# vgcfgrestore -n /dev/vg02
# vgchange -a y /dev/vg02
# vgsync /dev/vg02

Stf ;-)

[Madhu_17]

Mr.stf,

I told clearly that i tried all the basic things like these.

Can anybody suggest me regarding VG corruptions and recovry.

[RAC_1]

lvreduce -m 0 -k /dev/vgxx/u02 /dev/dsk/cxtxdx
The disk is the disk which is faulty and has been replaced by you.

If that succeeds, then do lvextend -m 1 /dev/vgxx/u02

Anil

[Stf]

OK...

1. what is the path of your new disk that causes problem?

2. can you attach result of strings /etc/lvmtab?

3. can you attach result of strings /etc/lvmconf/vg02.conf?

Stf ;-)

[Madhu_17]

I tried all these options. Looks like VG got corrupted. Any ideas about VG corruption and recovery?

[RAC_1]

MAdhu,

Dont jump to a conclusion. You have decided that the vg corrupted. That is what is causing the problem.
Be open, listen to what people say. Did you try my last post??? (Use of -k for lvreduce)

Anil

[Madhu_17]

Dear Anil,

I used pvkey option very inititally, while removing the bad disk from the mirror, before the disk replacement.

The problem started like this.

disk was missing completely after the reboot. means ioscan was not showing the disk and the lvdisplay was showing this disk as stale. so, before calling vendor i removed this disk from LV. at that time i used -k option, as it was not showing the dev. file in lvdisplay. instead it was showing question mark ("???" ).

after lvreduce, i did vgreduce.

after the disk replacement i did following.

pccreate, vgextend and lvextend.

[RAC_1]

OK, what is status as of now?? Is the disk in vg??

Anil

[Madhu_17]

after adding to the existing vg, it was still showing stale. so, i tried adding the same disk to the other VG successfully to test the functionality of the disk.

here my question is, why i'm unable to add the disk to the old VG. but i'm able to add to the other VG.

[RAC_1]

Do a vgreduve -f /dev/vgxx (This will force to remove the PVs missing/has problems)

Now check /etc/lvmtab and vgdisplay -v output to check if disk is in vgxx or not. If not do a pvcreate on it anddo a vgextend.

Anil

[Fred Ruffet]

can't you send us result for "pvdisplay -v /dev/dsk/cXtYdZ | head -50" ? We can't get further without more info.

Regards,

Fred

[Madhu_17]

Fred,

I have already removed the disk from the mirrpr. I will give you the details of pvdisplay tomorrow.

Thanks,
Madhu

[Fred Ruffet]

It is a little bit confusing when you talk about "disk". Disk is physical, mirror is logical, PV is logical. Even if you used lvreduce to break the mirror, PV is still there. You can use pvdisplay on it.
Your problem can come from this point : Did you get the whole process when you try to add the disk to the LV (pvcreate, vgextend, lvextend) or did you miss the pvcreate step ?

Regards,

Fred

[Madhu_17]

Fred,

I am getting the below message:

pvdisplay -v /dev/dsk/cxtydz
pvdisplay: Couldn't find the volume group to which
physical volume "/dev/dsk/cxtydz" belongs.
pvdisplay: Cannot display physical volume "/dev/dsk/cxtydz".

i tried pvcreate -f <> also. even after that it's giving the same error.

[Madhu_17]

in lvmtab and /etc/lvmconf/vgxx.conf, there is no entry related to this problematic disk