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TB-SUPPORT  February 2012

TB-SUPPORT February 2012

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Subject:

Re: Ticket summary - 20th Feb 12

From:

Alessandra Forti <[log in to unmask]>

Reply-To:

Testbed Support for GridPP member institutes <[log in to unmask]>

Date:

Tue, 21 Feb 2012 14:30:28 +0000

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (130 lines)

We all know this will not happen. Infact so far the max attention this 
problem has grabbed is today because someone else has to justify the 
situation.

cheers
alessandra



On 21/02/2012 13:43, John Gordon wrote:
> I agree with this but add that we should escalate the DPM issue/bug/feature.
>
>> -----Original Message-----
>> From: Testbed Support for GridPP member institutes [mailto:TB-
>> [log in to unmask]] On Behalf Of Jeremy Coles
>> Sent: 21 February 2012 13:19
>> To: [log in to unmask]
>> Subject: Re: Ticket summary - 20th Feb 12
>>
>>> I commented because it needed to be noted that, as with the CE tests
>> (which everyone kind of fudges by getting them special queues or
>> whatever), the tests here are encouraging suboptimal behaviour in the
>> service of passing a metric.
>>
>> Living in a 'community' means that technically optimal solutions are
>> not always appropriate, though they might be our aim eventually. Even
>> if you are driving in the wrong direction for your destination, it is
>> still better to adopt the driving rules reached by consensus because
>> they are there for a reason.
>>
>> The metrics based on ops tests are useful; the escalation in this case
>> (noted several times in this thread) is whether we should raise a
>> discussion about the rule making the current selection of SE tests
>> critical. While we have that discussion (perhaps in the storage group?)
>> and feedback our views (I agree with John that) it would seem sensible
>> to implement the workaround and reduce the negative impact the result
>> is having.
>>
>> Jeremy
>>
>>
>>
>> On 21 Feb 2012, at 12:30, Sam Skipsey wrote:
>>
>>>
>>> On 21 February 2012 12:08, Daniela Bauer
>> <[log in to unmask]>  wrote:
>>> But the ops tests have been around for *ages* and the consequences
>>> known, so I don't think it'll suit us well to feign surprise right
>>> now. Just give ops 500 GB and be done with it.
>>>
>>>
>>> Who's surprised? This has come up before as a complaint about
>> centralised testing with a "non useful" VO, and there have been various
>> efforts at working around it
>>> (packaging tests in randomly selected job wrappers, for example).
>>>
>>> I commented because it needed to be noted that, as with the CE tests
>> (which everyone kind of fudges by getting them special queues or
>> whatever), the tests here are encouraging suboptimal behaviour in the
>> service of passing a metric.
>>> It is, of course, the case that this fact isn't going to change
>> anything, but it seemed that someone should note it, again.
>>> [Again, Glasgow, for example, passes Ops storage tests partly because
>> the ops tests don't talk to the same filesystems that ATLAS use. The
>> ops tests, therefore, do not actually test
>>> the functionality of the overwhelmingly most important filesystems
>> for the availability of Glasgow as a functional site.]
>>> Sam
>>>
>>>
>>> Daniela
>>>
>>> On 21 February 2012 12:05, Sam Skipsey<[log in to unmask]>
>> wrote:
>>>>
>>>> On 21 February 2012 11:45, Stephen Burke<[log in to unmask]>
>> wrote:
>>>>> Testbed Support for GridPP member institutes [mailto:TB-
>>>>>> [log in to unmask]] On Behalf Of John Gordon said:
>>>>>> If this has been a long-standing DPM issue then I will ask to
>> have this
>>>>>> test (SRMput ?) removed from the SRMV2 set of tests so that it
>> isn't
>>>>>> included in availability.
>>>>> Even if there really was no free space for ops, does that make the
>> SE
>>>>> unavailable? Any VO may fill up its space, that doesn't mean the
>> site is
>>>>> broken. Probably the intention is that the test is just supposed
>> to verify
>>>>> the functionality and no-one has considered the possibility of it
>> being
>>>>> full. (CE tests are similar if the queues are full - there I think
>> most
>>>>> sites do have an explicit reservation just to let the ops tests
>> run.)
>>>> This is a valid point, and what I was getting at with my nagios
>> test
>>>> comment: the test doesn't test if the storage is available, it
>> tests if ops
>>>> can write to the storage. (Now, obviously, there's a point at which
>> you have
>>>> to consider that a test has to test *something*...). ATLAS,
>> meanwhile, can
>>>> happily write to the storage; and even ops tests are happy talking
>> to the
>>>> storage, and it is responding in a reasonable and sane way.
>>>>
>>>> I note that Manchester is an almost entirely ATLAS site. It seems
>> reasonable
>>>> that their availability be determined by their being available for
>> the
>>>> entities that they are supposed to be supporting in the main,
>> surely?
>>>> Sam
>>>>
>>>>> Stephen
>>>>
>>>
>>>
>>> --
>>> -----------------------------------------------------------
>>> [log in to unmask]
>>> HEP Group/Physics Dep
>>> Imperial College
>>> Tel: +44-(0)20-75947810
>>> http://www.hep.ph.ic.ac.uk/~dbauer/
>>>

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