Importing a VG with Reduced Number of PVs

[Narender Kumar]

I am having A VG with 4 PV.All the logical volumes are mirrored in such a way that 2PV are copy of the remaining two.
My question is can i export the VG and reimport using only 2 PV.Means reimport using a single copy of the data?

Thanks in Advance

Narender Kumar

[Torsten.]

It's better to reduce the mirror first.

see man lvreduce.

[Prashanth.D.S]

Hi Kumar,

Agreed with above statement..you can do the above mentioned activity follow the below procedure..

1. lvreduce
2. vgreduce
3. vgexport
4. vgimport

Best Regards,
Prashanth

[James R. Ferguson]

Hi:

Once you do the 'lvreduce -m 0 lv_path pv_path' for the physical volumes that you want to remove, then simply, 'vgreduce' the physical volumes that (now) lack logical extents. There is no need to 'vgexport' and 'vgimport'.

Regards!

...JRF...

[Narender Kumar]

I forgot to mention i wanted to keep the other copy intact.

Means do not want to lvreduce and vgreduce.

Just export with 4pv and reimport with 2pv.

Regards
Narender

[Torsten.]

Please explain your plan!

Do you want to preserve one copy?

In this case you should have a look at the lvsplit command.

man lvsplit

[Narender Kumar]

I want to keep both the copies in tact.And import the Vg with one copy without destroying the second copy.

So taht in case second copy is required the Vg can be imported with second copy.

Narender

[Siju Vadakkan · Accepted solution]

Hi,

export the vg without -s option.

vgexport -v -p -m

while importing specify the disks u want to use.,

vgimport -v -m

[nanan]

Hi
You can do that
No problem, do like above comments.

1. vgexport -v -p -m vgmap.map

2. vgimport -v -m vgmap.map vgname /dev/dsk/cXtYdZ /dev/dsk/cxtydz

Before you do 2nd step u have to create vg directory and mknod

Regards
nanan

[IT_2007]

You have to use lvsplit command so that your data on mirror disk won't be deleted.