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Support use of xrootd by HEP experiments

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Subject:
From:
"Yang, Wei" <[log in to unmask]>
Reply To:
Support use of xrootd by HEP experiments <[log in to unmask]>
Date:
Thu, 19 Jan 2012 15:12:49 -0800
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text/plain
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Hi Stephane,

Andy's statement described a model that is used by Babar (and may be by WT2 in the future), that is, a backend tape (or tape like) system holds all data, and disk are just frontend cache. So if a storage node with disk is down, other nodes will server the request from jobs  by fetching the data from tape backend. This may not be the case for you.

I think so far the method described in Patrick McGain's respond is probably the best option to drain a storage node.

regards,
Wei Yang  |  [log in to unmask]  |  650-926-3338(O)


On Jan 19, 2012, at 1:36 PM, Stephane Willocq wrote:

> Hi Andy,
> 
>   I was interested in your answer:
> 
> On 1/9/12 3:41 AM, Andrew Hanushevsky wrote:
>> P.S. The current model is that missing files from a faulty data server
>> would be automatically copied in on other servers when so requested.
>> That is a reasonable model is you assume that te ailure rate is
>> relatively small.
> 
> You mention an automatic copy to other servers can be requested. How do 
> we request this?
> 
> 
> Stephane.
> 
> 
>> On Sat, 7 Jan 2012, Doug Benjamin wrote:
>> 
>>> Hello,
>>> 
>>> Are there any xrootd commands to drain a faulty data server of files
>>> and distribute them across the
>>> rest of the data servers in the storage system.
>>> 
>>> Thanks,
>>> 
>>> Doug Benjamin
>>> 
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> 
> -- 
> -----------------------------------------------------------------
> Stephane Willocq                            Office (413) 545-0525
> Department of Physics                       Fax    (413) 545-0648
> University of Massachusetts
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