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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