VG import/export

[SAM_24]

Hi,

I have two servers A and B which are connected to the same storage array. When server B goes down I want to import the volume group created on Server A. Let us assume I've imported VGs on Server A. When server B comes online will it try to import VGs? Will it corrupt data? How LVM of server B will react?

Thanks.

[SAM_24]

Sorry,there is a typo. I want to import volume group created from server B on server A.

Thanks.

[Rajeev Shukla]

Its is a good idea to have the volume groups on both the servers. Like you can export the volume groups on server A and import it on B and vis versa.
And when one server goes down, activate the volume group on the other, So now even if the server which failed come online and tries to activate the volume group it wont be able to since its active on other server.
So dont worry it wont corrupt your volume group or data because if the volume groups is active on one node the other node can not activate it.

Rajeev

[Karthik S S]

Hi,

If you already have MC Service Guard on these servers you could automate this by configuring packages.

Else you will have to manually import/export

Regards,
Karthik S S

[Rizwan Mohammed]

Hi

MC Service guard does the same ,it activates vg in one machine at the time ,if you activate on both the VG then there will be data corruption problem ,you can write the shell scritpts too to do the same ,safe to use MCSG

Rizwan

[Tom Geudens]

Hi,
Other than using a cluster, there is no solution for your problem. However, if you can guarantee that only one of the servers is running at a given time, you might benefit from keeping mapfiles handy that are made with a "vgexport -p -s". With these mapfiles (which you need on both servers) you can recreate the volumegroups on the other server without having to know the exact disks of the volumegroup. The "vgimport -s" command will automagically find them for you.

Regards,
Tom Geudens