[Users] add NFS storage domain fails on mount timeout via ovirt

Bob Doolittle bob at doolittle.us.com
Wed Dec 11 17:18:21 UTC 2013

Be aware that I've also had issues where v4 failed but v3 worked. This 
happened when trying to export storage from the non-root partition. v4 
is fussier in that regard although I'm sure it's configurable somehow.

So the most general case I've found is to stick with v3, but make sure 
the firewall is properly configured on the storage server (or turn it off).

In summary, the advantages (I've found) of each:

NFSv3: requires no NFS configuration to export storage from non-root 
partitions (useful if you might want to upgrade your OS some day, 
although oVirt will have to deliver the feature for importing existing 
domains simply).

NFSv4: requires no firewall configuration (although I thought oVirt 
handled this automatically - did you change your firewall config after 

Good luck,

On 12/11/2013 12:02 PM, Einav Cohen wrote:
> Thanks Bob/Joop - checking the "Override Default Options"
> checkbox and selecting "V4" in the "NFS Version" drop-down
> within the "Advanced Parameters" section before hitting "OK"
> in the 'New Domain' dialog did the trick.
> ----
> Regards,
> Einav
> ----- Original Message -----
>> From: "Bob Doolittle" <bob at doolittle.us.com>
>> To: "Joop" <jvdwege at xs4all.nl>
>> Cc: "users" <users at ovirt.org>
>> Sent: Wednesday, December 11, 2013 11:20:01 AM
>> Subject: Re: [Users] add NFS storage domain fails on mount timeout via ovirt
>> Yes. In my experience when v4 works and v3 does not it's because of firewall
>> issues on the server.
>> -Bob
>> On Dec 11, 2013 11:17 AM, "Joop" < jvdwege at xs4all.nl > wrote:
>> Einav Cohen wrote:
>> Hi,
>> When trying to add an NFS Export domain via oVirt-engine, it fails on
>> "Problem while trying to mount target". when checking the vdsm.log, it seems
>> that the problem is mount time-out.
>> when I tried to manually run the mount command, in the exact same manner as
>> vdsm, it indeed failed on Connection timed out after ~3 minutes or so:
>> [root at localhost vdsm]# /usr/bin/mount -t nfs -o soft,nosharecache,timeo=600,
>> retrans=6,nfsvers=3 export/engine/storage/195/
>> iscsi-dc/export /rhev/data-center/mnt/ 11.2.3. 4:_home_ecohen_public_export_
>> engine_storage_195_iscsi-dc_ export mount.nfs: Connection timed out
>> but - when trying to run the mount command again, with the exact same mount
>> source and mount target, but without any additional parameter, it succeeded
>> (after ~10 seconds): [root at localhost vdsm]# /usr/bin/mount
>> public/export/engine/storage/ 195/iscsi-dc/export
>> /rhev/data-center/mnt/10.18. 57.137:_home_ecohen_public_
>> export_engine_storage_195_ iscsi-dc_export
>> My guesss its NFSv3 vs NFSv4
>> Joop
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