Hi Heiko,
I am not saying cmsd.log is a quick way to check the health of the cluster. Xrdmapc or xrdfs are the right tools. But the info in cmsd.log can help you figure out why xrdmapc and xrdfs aren't telling your all the data nodes. A quick way is to restart cmsd on the redirector. Within a few minutes, all data servers should register themselves to cmsd, and the cmsd.log will reflect that.
Data nodes that do not show up in cmsd.log will obviously won't show up in xrdmapc and xrdfs.
Xrootd cluster uses a subscription model. So the redirector will not view a disappearing data node as abnormal (except when 50% of the nodes disappear in a short period of time - for example). Assume that the person who setup the cluster has a list of data servers, one can compare that to the output of xrdmapc and xrdfs.
regards,
--
Wei Yang | [log in to unmask] | 650-926-3338(O)
-----Original Message-----
From: schroete <[log in to unmask]>
Date: Monday, January 18, 2021 at 10:20 PM
To: Wei Yang <[log in to unmask]>, xrootd-dev <[log in to unmask]>
Cc: "[log in to unmask]" <[log in to unmask]>
Subject: Re: List all xroot nodes by name
root@glogin ~ # xrdfs glogin:1095 locate -m /data
glogin.iup.uni-bremen.de:1095 Server Read
yes, i know 4.10.0 is old. But it is still operational and we dont need
the bleeding edge features of the new releases.
Also i know that i can retrieve the information from the cmsd.log file,
but it would be more helpful in daily operations to get these via a
command directly without searching the logs.
Ok, to turn the qeustion around:
How can i determine a dead node with xrd tools ?
Regards
Heiko
Am 18.01.21 um 22:49 schrieb Yang, Wei:
> How many servers do you have that export /data ? Does you redirector's cmsd.log show all data servers log in? This info should appear in the log right after the cmsd process was started.
>
> You can also use the following command, though this command sometimes give you IP address rather than host names.
>
> xrdfs glogin:1095 locate -m /data
>
> Xrootd 4.10.0 is old and I no longer have a 4.10.0 to validate the output. But I would be a bit surprised if to see a bug in xrdmapc in 4.10.0 since it has been there for a long time.
>
> regards,
> --
> Wei Yang | [log in to unmask] | 650-926-3338(O)
>
> -----Original Message-----
> From: Heiko Schröter <[log in to unmask]>
> Date: Monday, January 18, 2021 at 2:52 AM
> To: Wei Yang <[log in to unmask]>, xrootd-dev <[log in to unmask]>
> Cc: "[log in to unmask]" <[log in to unmask]>
> Subject: Re: List all xroot nodes by name
>
> Thank you for the response, but still no listing of the nodes. Only the
> master mode (glogin) shows up.
>
>
> root@glogin ~ # xrdmapc --list all glogin:1095 /data
> 0*r** glogin.iup.uni-bremen.de:1095
> > Srv glogin.iup.uni-bremen.de:1095
>
>
> root@glogin ~ # xrdmapc --list all --refresh glogin:1095 /data
> 0*r** glogin.iup.uni-bremen.de:1095
> > Srv glogin.iup.uni-bremen.de:1095
>
>
> root@glogin ~ # xrdmapc --list all --refresh --verify glogin:1095 /data
> 0*rv* glogin.iup.uni-bremen.de:1095
> >+ Srv glogin.iup.uni-bremen.de:1095
>
> Anything i overlook ?
> xrootd version v4.10.0
>
> Regards
> Heiko
>
>
> Am 2021-01-18 um 11:13 schrieb Yang, Wei:
> > You can use xrdmapc
> >
> > regards,
> > --
> > Wei Yang | [log in to unmask] | 650-926-3338(O)
> >
> > -----Original Message-----
> > From: <[log in to unmask]> on behalf of Heiko Schröter <[log in to unmask]>
> > Date: Monday, January 18, 2021 at 2:11 AM
> > To: xrootd-dev <[log in to unmask]>
> > Cc: "[log in to unmask]" <[log in to unmask]>
> > Subject: List all xroot nodes by name
> >
> > Hello all,
> >
> > is there an option to list all active nodes by name with xrdfs or such ?
> >
> > I can only find the stats output which gives me the total number of nodes.
> >
> > Thanks and Regards
> > Heiko
> >
> >
> >
> > --
> > -----------------------------------------------------------------------
> > Dipl.-Ing. Heiko Schröter
> > Institute of Environmental Physics (IUP) phone: ++49-(0)421-218-62092
> > Institute of Remote Sensing (IFE) fax: ++49-(0)421-218-62070
> > University of Bremen (FB1)
> > P.O. Box 330440 email: [log in to unmask]
> > Otto-Hahn-Allee 1
> > 28359 Bremen
> > Germany
> > -----------------------------------------------------------------------
> >
> > ########################################################################
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> > To unsubscribe from the XROOTD-DEV list, click the following link:
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> >
> >
>
>
>
--
-----------------------------------------------------------------------
Dipl.-Ing. Heiko Schröter
Institute of Environmental Physics (IUP) phone: ++49-(0)421-218-62092
Institute of Remote Sensing (IFE) fax: ++49-(0)421-218-62070
University of Bremen (FB1)
P.O. Box 330440 email: [log in to unmask]
Otto-Hahn-Allee 1
28359 Bremen
Germany
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