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Hi Andy,

Thank you for your help. Could you please tell how to tell XRootD redirector to "send the client to the dCache XRootD redirector" first? Right now, the two local XRootD redirectors:

  *   EOS XRootD redirector
  *   dCache XRootD redirector

join the upper level redirector using:
# tail xrootd-disk.cfg
.....
all.manager cmsxrootd-site3.fnal.gov:1213

----------
# tail xrootd-disk.cfg
.....
all.manager cmsxrootd-site3.fnal.gov:1213
--------------------

So, users access the files via cmsxrootd-site3.fnal.gov, e.g.,

>xrdcp -d 3 -f root://cmsxrootd-site3.fnal.gov//store/mc/myfile /dev/null

Could you please tell how to configure cmsxrootd-site3 XRooTD redirector to use xrootd-disk first?

Thanks again for your advice.


Regards,
Yujun




________________________________
From: Andrew Hanushevsky <[log in to unmask]>
Sent: Friday, April 22, 2022 3:20 PM
To: Yujun Wu <[log in to unmask]>
Cc: [log in to unmask] <[log in to unmask]>; David A Mason <[log in to unmask]>
Subject: Re: Specify the file location order/priorities

Hi Yujun,

The way you solve this problem is to visit the preferred places first. So,
in this case you would send the client to the dCache XRootD redirector and
if it does not have the file it would send the client to the EOS XRootD
redirector. Now, I am assuming that this is the way it is setup. If not,
then we may need a different plan.

Andy


On Fri, 22 Apr 2022, Yujun Wu wrote:

> Good morning.
>
> Could XRootD developers/experts help us with a special situation?
>
> We have two xrootd redirectors reporting to a higher-level redirector:
>
>
>  1.  Level 1: EOS XRootD redirector
>  2.                dCache XRootD redirector
>
>     2. Level 2: Site redirector
>
> User requests contact our site redirector and then the site redirector redirects the requests to either EOS XRootD redirector or dCache XRootD redirector. When a file is located in either EOS or dCache side, things are working as expected. However, when a file is located on both EOS and dCache, it seems EOS redirector is always chosen instead of dCache redirector. This is not ideal for us as we want to the files to be accessed from dCache XRootD redirector first.
>
> Could you please tell if there is a way in XRootD configuration file(s) to specify the order/priority when a user request comes in?
>
> Thanks in advance for any advice on this.
>
>
> Regards,
> Yujun
>
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