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From Dag Sonstebo <>
Subject Re: Hosts can not connect to secondary storage(NFS)
Date Fri, 30 Sep 2016 08:31:24 GMT
Hi Gumingda,

This is most likely to be caused by either lack of network connectivity between the hosts
and your NFS head (which I guess you will have checked) or permissions set in your /etc/exports
file on your NFS server.

If you have checked and ruled out both of these also check the UIDs of the users on your working
and non working hosts – if these are different you may find that the permissions on your
NFS server file system need to be relaxed – i.e. you may need to chmod to 0770 rather than

Dag Sonstebo
Cloud Architect


On 30/09/2016, 02:14, "明 达" <> wrote:

    Hi, Community
    We have a small production environment consists of 5 hosts (KVM, Ubuntu 14.04) and the
secondary storage is NFS running on an separated management host.
    Days ago,  we wrongly put one host in 'maintenance'  which caused all the VMs running
on that host to migrate to other available hosts.  but these hosts turned into 'alert' or
'disconnected' state on ACS UI, and meanwhile from the kernel log, we can see the repeated
message ' kernel: [3270144.284365] nfs: server not responding, timed out' .
    It seems all the hosts can not mount or unmount the NFS storage.  We have to use 'unmount
-lf' to forcely unmount the NFS and get the host state back to normal by restarting the libivrt
and cloudstack agent.  But the issue still sits there, all the hosts can not mount NFS with
the solid error 'nfs: server not responding, timed out'.
    To isolate this issue,  we added a fresh new host into the environment,  it can communicate
with NFS with no problem. So the issue seems only happens with the existing 5 hosts.   We
guess it could be fixed by restarting the hosts but we can not afford that as of now since
they are all running production apps now.
    Can anyone share some advice or hints to get the secondary storage back?   Thanks a lot
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