topic Re: How to move storage from MCSG-RAC to LVM mirror Should I just do it like this? in Operating System - HP-UX

How to move storage from MCSG-RAC to LVM mirror Should I just do it like this?

zero1022 — Mon, 29 Apr 2024 08:46:54 GMT

If the MCSG-RAC Rawdevice Volume Group is vg01

I want to change PV of vg01 to another storage, so I'm working on it.
New Storage: Newdisk#1, #2, #3
Old Storage: Old disk#1, #2, #3

<Node#1>
Add Newdisk #1, #2, and #3 (PV) to VG01 while online.
#lvextend -m 1 /dev/vg01/(raw device) /dev/disk/Newdisk#1 /dev/disk/Newdisk#2 /dev/disk/Newdisk#3
When the mirror is complete.

<Node#2>

Node#2 Service Down on Oracle RAC

#cmhaltnode Node#2

<Node#1>
#lvreduce -m 0 /dev/vg01/(raw device) /dev/disk/Olddisk#1 /dev/disk/Olddisk#2 /dev/disk/Olddisk#3

#vgreduce /dev/vg01 /dev/disk/Olddisk#1 /dev/disk/Olddisk#2 /dev/disk/Olddisk#3

#vgexport -v -p -s -m /tmp/vg01.map /dev/vg01

Move the /tmp/vg01.map file to Node#2

<Node#2>
#vgexport /dev/vg01
#mkdir /dev/vg01
#mknod /dev/vg01/group c 64 0x010000
#vgimport -v -s -N -m /tmp/vg01.map /dev/vg01
#chown oracle:dba /dev/vg01/r*
#vgchange -a s /dev/vg01
#cmrunnode

Node#2 Service Startup on Oracle RAC

Is there a problem with the above procedure?

Re: How to move storage from MCSG-RAC to LVM mirror Should I just do it like this?

georgek_1 — Thu, 25 Apr 2024 09:02:20 GMT

Hello zero1022,

It seems you have the vg activated in shared mode (running multinode package), if that's the case , then you wont be able to perform lvextend while the active in shared mode .

//from # man lvextend

Shared Volume Group Considerations
For volume group version 1.0 and 2.0, lvextend cannot be used if the
volume group is activated in shared mode. For volume groups version
2.1 (or higher), lvextend can be performed when activated in either
shared, exclusive, or standalone mode.

Please check the vg version and proceed .

If vg version 2.1 or higher, you may proceed with activity online , no need to halt the package .

Else , plan the downtime , halt the package and activate the vg in normal node perform lvextend,lvreduce,vgreduce export & import as you mentioned .

I work for HPE/ I am an HPE Employee (HPE Community)

Re: How to move storage from MCSG-RAC to LVM mirror Should I just do it like this?

zero1022 — Mon, 29 Apr 2024 00:35:01 GMT

That's the part I missed
Thanks to this, I was able to prepare well for the work.
Thank you.

Re: How to move storage from MCSG-RAC to LVM mirror Should I just do it like this?

Sunitha_Mod — Mon, 29 Apr 2024 06:08:58 GMT

Hello @zero1022,

That's Excellent!

We are extremely glad to know the problem has been resolved.