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Support use of xrootd by HEP experiments


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Alden Stradling <[log in to unmask]>
22 Sep 2010 08:36:22 -0500Wed, 22 Sep 2010 08:36:22 -0500
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On Sep 22, 2010, at 8:34 AM, Lukasz Janyst wrote:

> Hi Alden,
>   I haven't run this stuff before on MacOS but it's mostly the same
> code that runs on Linux (where we don't see problems) and the platform
> specific stuff is pretty well isolated so if there is a memory leak it
> should be fairly easy to spot. Can you describe your access pattern?

> Do you usually copy files via xrdcp or do you access the files via
> root with long standing sessions, etc?

Both xrdcp (for file import), then direct access inside of pyroot sessions (batch mode, long duration). 

> What is the authentication
> plug-in you use?

Nothing, so far. :S



> Cheers,
>   Lukasz
> On Sat, Sep 18, 2010 at 3:32 PM, Alden Stradling
> <[log in to unmask]> wrote:
>> Four Mac Pros -- one internal 6 TB RAID each (Data_1), and between 0 and 4 external drives added to the pool (Data_2 through Data_5). The machines are also being used as compute nodes. An independent Linux redirector is also set up.
>> So -- a computing cluster, with xrd as the file access mechanism.
>> Thanks,
>> Alden
>> On Sep 18, 2010, at 6:49 AM, Lukasz Janyst wrote:
>>> Hi Alden,
>>>   could you describe in more details what you're trying to do? In
>>> particular from your email it's not really clear to me whether you're
>>> running an XRootD storage cluster or a computing cluster and using
>>> xroot's client software to access data.
>>> Cheers,
>>>   Lukasz
>>> On Fri, Sep 17, 2010 at 8:01 PM, Alden Stradling
>>> <[log in to unmask]> wrote:
>>>> Is there anyone on this list who has experience building and running xrd on OS X machines?
>>>> I have a small cluster of Mac Pros -- and they are having tremendous problems under load (and what appear to be memory leaks). This may be entirely my fault -- I may have built the binaries wrong, or configured things stupidly.
>>>> I'm hoping someone with practical experience might be able to point me in the right direction.
>>>> Thanks,
>>>> Alden