[ovirt-users] storage issue's with oVirt 3.5.1 + Nexenta NFS

[Maikel vd Mosselaar]

Hi Juergen,

The load on the nodes rises far over >200 during the event. Load on the 
nexenta stays normal and nothing strange in the logging.

For our storage interfaces on our nodes we use bonding in mode 4 
(802.3ad) 2x 1Gb. The nexenta has 4x 1Gb bond in mode 4 also.

Kind regards,

Maikel


On 04/21/2015 02:51 PM, InterNetX - Juergen Gotteswinter wrote:
> Hi,
>
> how about Load, Latency, strange dmesg messages on the Nexenta ? You are
> using bonded Gbit Networking? If yes, which mode?
>
> Cheers,
>
> Juergen
>
> Am 20.04.2015 um 14:25 schrieb Maikel vd Mosselaar:
>> Hi,
>>
>> We are running ovirt 3.5.1 with 3 nodes and seperate engine.
>>
>> All on CentOS 6.6:
>> 3 x nodes
>> 1 x engine
>>
>> 1 x storage nexenta with NFS
>>
>> For multiple weeks we are experiencing issues of our nodes that cannot
>> access the storage at random moments (atleast thats what the nodes think).
>>
>> When the nodes are complaining about a unavailable storage then the load
>> rises up to +200 on all three nodes, this causes that all running VMs
>> are unaccessible. During this process oVirt event viewer shows some i/o
>> storage error messages, when this happens random VMs get paused and will
>> not be resumed anymore (this almost happens every time but not all the
>> VMs get paused).
>>
>> During the event we tested the accessibility from the nodes to the
>> storage and it looks like it is working normal, at least we can do a normal
>> "ls" on the storage without any delay of showing the contents.
>>
>> We tried multiple things that we thought it causes this issue but
>> nothing worked so far.
>> * rebooting storage / nodes / engine.
>> * disabling offsite rsync backups.
>> * moved the biggest VMs with highest load to different platform outside
>> of oVirt.
>> * checked the wsize and rsize on the nfs mounts, storage and nodes are
>> correct according to the "NFS troubleshooting page" on ovirt.org.
>>
>> The environment is running in production so we are not free to test
>> everything.
>>
>> I can provide log files if needed.
>>
>> Kind Regards,
>>
>> Maikel
>>
>>
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