as additional info, the DNS seems to do well its RR job: from the same machine
-bash-3.2$ host xrootd-cms.infn.it
xrootd-cms.infn.it has address 193.205.76.83
xrootd-cms.infn.it has address 90.147.66.75
-bash-3.2$ host xrootd-cms.infn.it
xrootd-cms.infn.it has address 90.147.66.75
xrootd-cms.infn.it has address 193.205.76.83
-bash-3.2$ host xrootd-cms.infn.it
xrootd-cms.infn.it has address 90.147.66.75
xrootd-cms.infn.it has address 193.205.76.83
-bash-3.2$ host xrootd-cms.infn.it
xrootd-cms.infn.it has address 90.147.66.75
xrootd-cms.infn.it has address 193.205.76.83
-bash-3.2$ host xrootd-cms.infn.it
xrootd-cms.infn.it has address 193.205.76.83
xrootd-cms.infn.it has address 90.147.66.75
So each time the order returned is random, in case xrootd would need to depend on this
BUT: inside xrdcp log, the order seems always to be the same (*)
is some caching done inside xrdcp killing the RR?
tom
*:
-bash-3.2$ grep DNS log
140415 12:32:21 001 Xrd: ConvertDNSAlias: resolving xrootd-cms.infn.it
140415 12:32:21 001 Xrd: ConvertDNSAlias: found host xrootd-redic.pi.infn.it with addr 193.205.76.83
140415 12:32:21 001 Xrd: ConvertDNSAlias: found host xrootd.ba.infn.it with addr 90.147.66.75
140415 12:32:21 001 Xrd: ConvertDNSAlias: resolving xrootd-cms.infn.it
140415 12:32:21 001 Xrd: ConvertDNSAlias: found host xrootd-redic.pi.infn.it with addr 193.205.76.83
140415 12:32:21 001 Xrd: ConvertDNSAlias: found host xrootd.ba.infn.it with addr 90.147.66.75
140415 12:32:26 001 Xrd: ConvertDNSAlias: resolving xrootd-cms.infn.it
140415 12:32:26 001 Xrd: ConvertDNSAlias: found host xrootd-redic.pi.infn.it with addr 193.205.76.83
140415 12:32:26 001 Xrd: ConvertDNSAlias: found host xrootd.ba.infn.it with addr 90.147.66.75
140415 12:32:31 001 Xrd: ConvertDNSAlias: resolving xrootd-cms.infn.it
140415 12:32:31 001 Xrd: ConvertDNSAlias: found host xrootd-redic.pi.infn.it with addr 193.205.76.83
140415 12:32:31 001 Xrd: ConvertDNSAlias: found host xrootd.ba.infn.it with addr 90.147.66.75
140415 12:32:36 001 Xrd: ConvertDNSAlias: resolving xrootd-cms.infn.it
140415 12:32:36 001 Xrd: ConvertDNSAlias: found host xrootd-redic.pi.infn.it with addr 193.205.76.83
140415 12:32:36 001 Xrd: ConvertDNSAlias: found host xrootd.ba.infn.it with addr 90.147.66.75
140415 12:32:41 001 Xrd: ConvertDNSAlias: resolving xrootd-cms.infn.it
140415 12:32:41 001 Xrd: ConvertDNSAlias: found host xrootd-redic.pi.infn.it with addr 193.205.76.83
140415 12:32:41 001 Xrd: ConvertDNSAlias: found host xrootd.ba.infn.it with addr 90.147.66.75
140415 12:32:46 001 Xrd: ConvertDNSAlias: resolving xrootd-cms.infn.it
140415 12:32:46 001 Xrd: ConvertDNSAlias: found host xrootd-redic.pi.infn.it with addr 193.205.76.83
140415 12:32:46 001 Xrd: ConvertDNSAlias: found host xrootd.ba.infn.it with addr 90.147.66.75
140415 12:32:51 001 Xrd: ConvertDNSAlias: resolving xrootd-cms.infn.it
140415 12:32:51 001 Xrd: ConvertDNSAlias: found host xrootd-redic.pi.infn.it with addr 193.205.76.83
140415 12:32:51 001 Xrd: ConvertDNSAlias: found host xrootd.ba.infn.it with addr 90.147.66.75
140415 12:32:56 001 Xrd: ConvertDNSAlias: resolving xrootd-cms.infn.it
140415 12:32:56 001 Xrd: ConvertDNSAlias: found host xrootd-redic.pi.infn.it with addr 193.205.76.83
140415 12:32:56 001 Xrd: ConvertDNSAlias: found host xrootd.ba.infn.it with addr 90.147.66.75
On 15 Apr 2014, at 12:33, Tommaso Boccali <[log in to unmask]> wrote:
> Ciao,
> as from a previous discussion, we have setup an aliased DNS xrootd redirector,
>
> which is
>
> -bash-3.2$ host xrootd-cms.infn.it
> xrootd-cms.infn.it has address 90.147.66.75
> xrootd-cms.infn.it has address 193.205.76.83
>
> I was playing with some crash tests, and I do not get the result.
>
> So: I switched off the redirector 193.205.76.83, while keeping it into the alias, and I issued a
>
> xrdcp -d 10 root://xrootd-cms.infn.it//store/data/Run2013A/MinimumBias/RECO/PromptReco-v1/000/212/188/00000/6C246B92-C67B-E211-BE02-003048D2BC62.root .
>
> I was assuming that the client would have recognized the alias, and eventually tried a second host if the first was not available.
>
> In the log ( https://www.dropbox.com/s/zmp9uyreqm4qwhg/xrootd.log )
> I see eventually the client recognizes the situation:
>
> 140415 12:25:11 001 Xrd: ConvertDNSAlias: found host xrootd-redic.pi.infn.it with addr 193.205.76.83
> 140415 12:25:11 001 Xrd: ConvertDNSAlias: found host xrootd.ba.infn.it with addr 90.147.66.75
> 140415 12:25:11 001 Xrd: ShowUrls: The converted URLs count is 2
> 140415 12:25:11 001 Xrd: ShowUrls: URL n.1: root://xrootd-redic.pi.infn.it:1094//store/data/Run2013A/MinimumBias/RECO/PromptReco-v1/000/212/188/00000/6C246B92-C67B-E211-BE02-003048D2BC62.root.
> 140415 12:25:11 001 Xrd: ShowUrls: URL n.2: root://xrootd.ba.infn.it:1094//store/data/Run2013A/MinimumBias/RECO/PromptReco-v1/000/212/188/00000/6C246B92-C67B-E211-BE02-003048D2BC62.root.
>
> but then
>
> 140415 12:25:46 001 Xrd: Open: Trying to connect to xrootd-redic.pi.infn.it:1094. Connect try 8
> 140415 12:25:46 001 Xrd: XrdClientConn: Trying to connect to 193.205.76.83:1094
> 140415 12:25:46 001 Xrd: Connect: Creating a logical connection...
> 140415 12:25:46 001 Xrd: Connect: Physical connection not found. Creating a new one...
> 140415 12:25:46 001 Xrd: Connect: Connecting to [xrootd-redic.pi.infn.it:1094]
> 140415 12:25:46 001 Xrd: ClientSock::TryConnect_low: Trying to connect to xrootd-redic.pi.infn.it(193.205.76.83):1094 Windowsize=0 Timeout=120
> 140415 12:25:46 001 Xrd: ClientSock::TryConnect_low: Connection toxrootd-redic.pi.infn.it:1094 failed. (-1)
> 140415 12:25:46 001 Xrd: Connect: can't open connection to [xrootd-redic.pi.infn.it:1094]
> 140415 12:25:46 001 Xrd: PhyConnection: Disconnecting socket...
> 140415 12:25:46 001 Xrd: Connect: Connect(xrootd-redic.pi.infn.it, 1094) returned -1
> 140415 12:25:46 001 Xrd: XrdNetFile: Error creating logical connection to xrootd-redic.pi.infn.it:1094
> 140415 12:25:46 001 Xrd: Open: Disconnecting.
> 140415 12:25:46 001 Xrd: Cache: Cache Status --------------------------
> 140415 12:25:46 001 Xrd: Cache: -------------------------------------- fTotalByteCount = 0
> Last server error 10000 ('')
> Error accessing path/file for root://xrootd-cms.infn.it//store/data/Run2013A/MinimumBias/RECO/PromptReco-v1/000/212/188/00000/6C246B92-C67B-E211-BE02-003048D2BC62.root
>
> so no attempt is done on the other. What is wrong here? all in all it tries 8 times to connect to the SAME server, and 0 times to the other ...
>
>
> thanks a lot
>
> tom
>
> --
> Tommaso Boccali
> INFN Pisa
>
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