Why vgchgid?

[SAM_24]

Hi,

I didn't get why vgchgid is required if I mount the file systems from BCV disks on BCV host?

I have system A & B , both are connected to EMC box. On A production FS are mounted. I do establish and split. Can I mount the bcv disks on system B without changing disk group id?

Thanks.

[Stefan Farrelly · Accepted solution]

If you mount the BCV disks on the SAME HP server they were split off from (ie. are a copy of disks on that server) then you must run vgchgid first or else you will be trying to import a volume group which has exactly identical VG/LVM header info as a VG already in use on your server. As you can see this would undoubtedly confuse your HP server.

If you mount the BCV's on a different HP server to where they were copied from then you dont need to run it.

[Animesh Chakraborty]

hi,
If your bcv devices are attached to a different server then no need to change the vgid.
I do bcv sync and split on regular basis without changing any vgid.

[Ashwani Kashyap]

Only if you mount it on the same server do you need to do vgchgid to change the VG headers . It you ,ount it on another server you don't need to do it . you can directly import the VG's .

[John Poff]

Hi,

One other consideration is if system A and system B are nodes in ServiceGuard. If the production file systems on system A could failover and be mounted on system B, then you would want the BCV volumes on system B to have the vgchgid run on them before importing and mounting them, so that there would be no complaint during a failover.

JP

[MANOJ SRIVASTAVA]

You ahve to do a vgchgid if you are chaning the servers appratnly there is a server id writern in VG information and if u trty to do a vgimport on the server B it will ask you tod o a vgchid or it way complaing like the this vg belongs to another machine


Do a vgchgid and then doa vgimport .


Manoj Srivastava