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Xenserver pool master server for maintanance

Hi,

I have 3 xen servers in a pool. I am planning to upgraded al 3 server's memory. I planned to do one by one at a time. when i do for pool master (xen1) i will move all vm's into xen2 and xen2, then i will shutdown the pool master and upgrade the RAM and start the pool master server. Is it the right way.

My doubt is, If I down the pool master for memory upgrade, will VM's in other server work?

Thanks

ASKER CERTIFIED SOLUTION

Ayman Bakr

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kolathaya123

ASKER

Thanks a lot.

One more question.

I don't have full resource to move all vm's into other server's . only 50% of VM's I can move. In this case. first I can shutdown 50% of VM's in the pool master, the put the pool master in maintenance more, so other 50% VM's will move to other hosts and new pool master will be elected right. Then I will switch of pool master, upgrade memory, start pool master, exit maintenance mode.

Is this correct?

Ayman Bakr

Yep, you are right. The idea is not to have any VM running on the xenserver you want to bring down. So whether you would like 100% migration, 50% migration or 0% migration of VMs, you need to ensure that the VMs are not running on that XenServer and thus you need to shut down those that are not migrated.

Then when you enter maintenance mode, you are telling the system to disable the XenServer from accepting any VM to start on it, migrate VMs if any exist to other XenServers, and if the XenServer is a pool master, trigger an election for another server to be the pool master.

Next you shut down, do the upgrade, bring it up, test that VMs can start on it, working fine and continue with the rest of the XenServers.

kolathaya123

ASKER

Thank you very much..

kolathaya123

ASKER

Hi,

One more question:

if my pool master is down due to power, I can restore the pool master role to another server in the pool using xe pool-emergency-transition-to-master. But how to bring the VM's from the dead pool master? will they come automatically into the new pool ?

Ayman Bakr

The attached file should help you.

XenServer-System-Recovery-Guide-.pdf