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ciao andrew, understood & it makes sense, thanks. But then. I need a different solution for stageout. As you explained to me here, all.manager meta all xrootd.infn.it+ 1213 (probably wrong since gmail is playing with the text, but nevermind ... it is what you wrote ;) needs xrootd.infn.it to be the list of all possible redirectors, regardless of their state. Fine. On the other hand, for CMSSW fallback I need to specify something like if file /store/file.root not locally available --> try root:// xrootd.infn.it//store/file.root in this case, instead, I want xrootd.infn.it to resolve only to those redirectors which are _currently_ ok, right? then I am afraid I need 2 DNS aliases - xrootd-fulllist.infn.it : the machines which are installed as redirector, from which nagios never removes anything - xrootd.infn.it : the subset of the previous with only currently working redirectors, to be used in the fallback statement. Is this correct? thanks again! tom On Fri, Mar 28, 2014 at 8:41 PM, Andrew Hanushevsky <[log in to unmask]>wrote: > Hi Tommaso, > > See below... > > > On Fri, 28 Mar 2014, Tommaso Boccali wrote: > > Let's say we prepare 2 regional redirectors, 1.1.1.1 and 2.2.2.2, and we >> punt them in the DNS as xrootd.infn.it (no round robin: "host >> xrootd.infn.it" >> will return 2 IP addresses). >> Since we want to use xrootd.infn.it as fallback, we plan to have a nagios >> test which checks 1.1.1.1 and 2.2.2.2 periodically, and in case one is NOT >> ok, it is removed from the DNS. >> > You shuld never remove anuthing from DNS, it will break all the > recoverability aspects of xrootd. Even if it's broken it should remian in > DNS. Hence, you don't need anything special. Just leave both servers in DNS > all teh time. > > > So, question was: > >> let's say that site ABCD needs to restart the xrootd local servers, which >> are configured as >> >> all.manager meta all *xrootd.infn.it <http://xrootd.infn.it>*+ 1213 >> > Uhm, tyhe above won't work/ Perhaps you really wanted to say > > > all.manager meta all xrootd.infn.it+ 1213 > >> what happens if AT THE RESTART MOMENT xrootd.infn.it only resolves to >> 1.1.1.1 (since eventually 2.2.2.2 is broken)? And even more, what if 2 >> hours later 2.2.2.2 enters again the DNS resolution for >> > It won't re-resolve. That's why you always leave both addresses in DNS. > > Andy > -- Tommaso Boccali INFN Pisa ######################################################################## 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