lvmerge

[himacs]

Hi Admins,

We had a fc driver upgradation activity and before rebooting we had splitted the root LVs using lvsplit.After rebooting we found some issue with primary disk kernel and booted the server with secondary disk.NOw i have to merge the LVs using lvmerge.

As per the lvmerge concept new lv name obtained during lvsplit be given first with lvmerge

lvmerge /dev/vg00/lvol1b /dev/vg00/lvol1

As per my understanding /dev/vg00/lvol1b belongs to secondary disk and what lvmerge does is merging secondary LVs with primary.

Please correct me if i am wrong..

As said earlier my server runnning with secondary disk kernel since issue with primary disk.Sec disk having new data and primary disk has old data after rebooting.

In this case how i can execute lvmerge command..?

[Patricio Besteiro]

from man page:

/etc/lvmerge backup_lv_path master_lv_path

Data previously contained in the backup_lv_path is resynchronized
using the data in the master_lv_path. All new data on the
backup_lv_path is lost.

If I understood well you are using secondary disk because you had issues with primary, you can check that with a bdf, so now the backup_lv is your master_lv then the command should be:

lvmerge /dev/vg00/lvol1 /dev/vg00/lvol1b

regards,

[Kranti Mahmud]

Hi Himacs,

Check the below link:

http://docs.hp.com/en/B2355-90681/lvmerge.1M.html

Rgds-Kranti

[Adisuria Wangsadinata_1]

Hi himacs,

Good day to you !
As per 'lvmerge' manual, you can see the example of how to use 'lvmerge' command :

Merge /dev/vg00/lvol1b with /dev/vg00/lvol1.
Data in /dev/vg00/lvol1b will be overwritten by /dev/vg00/lvol1 and /dev/vg00/lvol1b will be removed.

# lvmerge /dev/vg00/lvol1b /dev/vg00/lvol1

For your case, since you would like to obtain the secondary LVs (/dev/vg00/lvol1b), so the command is like below :

# lvmerge /dev/vg00/lvol1 /dev/vg00/lvol1b

And to solve the problem on the old data on primary disk, please do the backup before merge the LVs.

Hope this information can help.

Regards,
Adi.