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

[Gerry O'Brien]

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

-- 
Gerry O'Brien

Systems Manager
School of Computer Science and Statistics
Trinity College Dublin
Dublin 2
IRELAND

00 353 1 896 1341