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Hi Eric,

The error message is printed when the client is saying that it tried the 
server that the redirector told it to use but could not find the file 
there or got an I/O error. Since you have configured a Distributed File 
System as the source of the data then any error on one server would, 
presumably, be the same error on any other server (it is a DFS which 
should be the same for every server). The redirector, by default, allows 
this to happen twice. On the third attempt it issues the error message 
because clearly there is no progress in resolving the problem by picking 
another data server.

To find out what the error actually is, look at the data server log files 
around the time the redirector issues the message and it will show what 
the problem is at the server level.

Andy

On Tue, 3 Jan 2017, Gough, Erik S wrote:

> Hello,
>
> I see an error in the Purdue xrootd logs that causes me some concern.
> After a scan of the logs I see it can occur up to 100k times a day. Here
> an example log entry from xrootd.log on our redirector:
>
> 170103 03:29:56 64059 Decode xrootd gave
> uscms407.30510:[log in to unmask] err -2 'Too many
> attempts to gain dfs read access to the
> file' /store/data/Run2016G/Charmonium/AOD/23Sep2016-v1/70000/8087EC19-1496-E611-B526-008CFA0008C4.root
> 170103 03:29:56 64161 uscms407.30510:[log in to unmask]
> XrootdResponse: sending err 3011: Too many attempts to gain dfs read
> access to the file
>
> I was thinking this could be related to the 'limit' option for cms.dfs
> configuration on the redirector, but we don't have that option set which
> from my understanding makes there be no limit.
>
> Here is the cms.dfs configuration line:
> cms.dfs lookup distrib mdhold 10m redirect immed
>
> I attached our whole configuration file as well.
>
> Any thoughts on what could be causing this error?
>
> Thanks,
> -Erik
>
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>
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