[one-users] What is the best way to reboot a storage server in order to cause the least amount of disruption to running VMs?

[Michael]

Hi Gerry,

While I don't have any recommendations on the reboot process, if you're 
using KVM I'd certainly recommend Ceph as a solution for high 
availability storage. We've gone as far as rolling linux distribution 
upgrades to our storage cluster with no loss of VM connectivity.

-Michael

On 29/04/2014 16:50, Gerry O'Brien wrote:
> Hi,
>
>     Our OpenNebula Debian Wheezy storage server has been running for 
> 466 days and needs to be rebooted as there have been many kernel 
> patches during this time. It exports the datastores to the hosts using 
> NFS.
>
>     What is the best way to reboot the server in order to cause the 
> least amount of disruption to running VMs? I've thought about 
> suspending all running VMs, rebooting the storage server and resuming 
> the VMs after the storages serveris back. Would this work? Obviously, 
> any VMs that have to maintain real time connections would be in 
> trouble, e.g. iSCSI mounts, but would an ordinary machines resume 
> successfully after the storage server reboots. The host NFS mounts are 
> as here: /datastores                     nfs 
> vers=4,bg,rw,_netdev,fsc,rsize=32768,wsize=32768,intr,noatime
>
>     In general, is there a recommended way of providing HA storage to 
> hosts?
>
>             Regards,
>                 Gerry
>