Hi Antonio,
Only problematic issue im aware of a mixing environment of UMD-2 / UMD-3
its the cream-ce's not directly related with cream itself but related
to APEL services which uses different clients.
Cheers
joao Pina
On 02/12/2014 10:30 AM, Antonio Delgado Peris wrote:
> Hi,
>
> Thanks Peter.
>
> Mixing EMI-2 and EMI-3 WNs is an interesting use case for us, because it
> avoids a complete downtime of the site for the upgrade, though we will
> certainly schedule one if it is required.
>
> However, since we do not support MPI jobs at CIEMAT, let me ask for more
> information regarding your comment: are there any other specific
> problems related to the mix of WN from different versions, or just MPI?
> Well, even if you tell me that there are no precise issues but that the
> configuration was not tested or is in general suspected to cause
> problems, we will consider it enough to avoid risking it :-)
>
> Cheers,
> Antonio
>
>
>> Dear Antonio,
>>
>> EGI UMD verifiers tested, although not extensively, a mixed
>> configuration with CREAM and WN from different EMI versions.
>> CREAM EMI-3 and WN EMI-2 are compatible. And also the other way around.
>>
>> What is not advisable is to have some WN from EMI-2 and other from
>> EMI-3 in the same subcluster, because some applications such as MPI do
>> not work properly with different WN versions together.
>>
>> Regards
>> Peter
>>
>>
>> On 11 February 2014 18:47, Antonio Delgado Peris
>> <[log in to unmask]> wrote:
>>> Dear all,
>>>
>>> We have recently received a message regarding the UMD-2/EMI-2
>>> decommissioning calendar, notifying us about the need to start
>>> planning the
>>> upgrade to EMI/UMD-3 services.
>>>
>>> Thinking about a possible gradual upgrade, I would like to ask about
>>> compatibility issues when mixing EMI/UMD-2 and EMI/UMD-3 services, in
>>> particular in what regards WNs, glexec, CREAMs, Argus and BDII. E.g.:
>>> can we
>>> mix different WNs from both releases and different CREAMs from both
>>> also?
>>>
>>> Given that I've found no warning against this, my first idea is that all
>>> combinations should be possible (except for the case of APEL**), but
>>> I would
>>> like to be sure.
>>>
>>> ** Warned here:
>>> https://wiki.egi.eu/wiki/UMD-3:UMD-3.0.0#emi.apel.sl6.x86_64
>>>
>>> Thanks a lot for any comments!
>>>
>>> Cheers,
>>>
>>> Antonio
>>
>>
>
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