[Gluster-users] GlusterFS failover with UCarp

[Matthew Temple]

We tried using this model with last year with VMWare, and found it to
fail.   We were using UCARP.   I found a number of places on the web
indicating that UCARP, Gluster, and NFS would work for VMWare storage, but
further discussion really convinced me that the people who proposed it as a
solution could only say that it /should/ work, not that it /would/ work.
The same article proliferated all over the net.
So I wonder if anyone has used it successfully.   With that said, CTDB
/looks/ like it should work for that, but does it?   Has anyone used it?

Matt Temple

------
Matt Temple
Director, Research Computing
Dana-Farber Cancer Institute.



On Mon, Oct 22, 2012 at 7:23 PM, Runar Ingebrigtsen <runar at rin.no> wrote:

> On ma. 22. okt. 2012 kl. 20.02 +0200, Runar Ingebrigtsen wrote:
>
>> On ma. 22. okt. 2012 kl. 19.11 +0200, Brian Candler wrote:
>>
>>> On Thu, Oct 18, 2012 at 06:48:42PM +0200, Runar Ingebrigtsen wrote:
>>>
>>>>     The connection break behavior is to be expected - the TCP
>>>> connection
>>>>     doesn't handle the switch of host. I didn't expect the NFS
>>>> client to go
>>>>     stale.
>>>>
>>>
>>> I can't answer this directly but I did notice something in the 3.3.1
>>> change
>>> log which might be relevant:
>>>
>>> <http://www.gluster.org/**community/documentation/index.**
>>> php/GlusterFS_3.3.1<http://www.gluster.org/community/documentation/index.php/GlusterFS_3.3.1>
>>> >
>>>
>>>
>>>    "nfs: make NFS filehandles deterministic
>>>
>>> If you're not on 3.3.1 already, it could be worth trying.
>>>
>>
>> Thank you. I have just realized that there's a built-in NFS server -
>> but I set this up with the /etc/exports.
>>
>> I'll try to use the built-in and see if the problem persists, then try
>> 3.3.1 if it does.
>>
>
> So I tried to use the default NFS settings, with no luck.
> Then I upgraded to 3.3.1, still with no luck.
>
> Seems like the NFS connection is unable to perform a failover. I would
> really love to hear if someone have this working.
>
> The reason I want this is to use glusterfs to store virtual machines for
> VMware.
>
> --
> Best Regards
> Runar Ingebrigtsen
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