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Hi Sam, You hit the nail in the head. The local cmsd needs to do a stat() on the file unless it knows specifically that all of the servers it's managing a true proxy servers. So, if you give me the config file you think should work I'll look at it and send you back an annotated version that really should work. Andy On Mon, 1 Jun 2020, Sam Skipsey wrote: > Hi, > > A few months ago, I tried setting up an xrootd redirector in front of > some xrootd proxy cache servers, and despite considerable to and fro > here from several people, we never managed to work out why it didn't > work. So, I dropped this as there were more pressing issues to deal > with at the time. > > Now I'm back, and have a more directed question after more testing: > > I have a node with xrootd 4.12.1 installed on it. > > Things that work: > 1. (xrootd+cmsd) redirector in front of (xrootd+cmsd) server attached > to local filesystem. > 2. xrootd server using xrootdceph plugin attached to ceph cluster. > 3. xrootd proxy cache in front of xrootd server from [2] > > Things that don't work: > A. (xrootd+cmsd) redirector in front of [2] > B. (xrootd+cmsd) redirector in front of [3] > > In both of the failing cases, the redirector complains that > [ERROR] Server responded with an error: [3011] No servers have read > access to the file (source) > > which is obviously false, since I can copy happily from both the > server itself and the cache in front of it. > > So, I think the problem here is somewhere in how the cmsds get > information about what files are available, and how this interacts > with the XrootdCeph plugin? > Obviously, the ceph instance has a *lot* of objects in it, and it's > not clear to me if there's something special that needs to be done to > help everything sync up. > > [I also note that it's not clear to me how you configure a cmsd for an > xrootd server which is using a plugin for ofs. Since the cmsd is very > upset if I include ofs directives in the part of the config file it > can read, I assume it shouldn't be able to see those, so my config > file explicitly wraps them in an "if exec xrootd" block. Is that what > I should be doing?] > > Any help appreciated, > > Sam > > ######################################################################## > Use REPLY-ALL to reply to list > > To unsubscribe from the XROOTD-L list, click the following link: > https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-L&A=1 > ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the XROOTD-L list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-L&A=1