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Support use of xrootd by HEP experiments

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23 Mar 2005 12:05:41 -0800Wed, 23 Mar 2005 12:05:41 -0800
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Hi all,

Suggestion on config simplification would be welcome here. I can propose two 
simplification to avoid "feature interaction":

a) Default all paths exported by the old to be r/w. That means if you want 
an explicit r/o path, you will have to declare it as such. If you don't 
write operations will be redirected to r/o servers and the operation will 
fail at that point.

b) In the absence of an oss.cache directive, the olb would infer file 
systems from the olb.path directive (if any) to figure out for which file 
systems it must report space usage.

What do people think of that? I'm really looking for suggestions on 
simplification here. without them, I'm sort of at a loss to make things 
simpler.

Andy

----- Original Message ----- 
From: "Wilko Kroeger" <[log in to unmask]>
To: "Derek Feichtinger" <[log in to unmask]>
Cc: "xrootd mailing list" <[log in to unmask]>
Sent: Wednesday, March 23, 2005 8:54 AM
Subject: Re: writing via redirector



Hello Derek

In our test setup writing through the redirector is working.
As far as I can tell your problem is that the oss part is not configured.
I have to talk to Andy to find out if it is possible to get away without
the oss part.
Anyhow, I appended the two config files for our data servers
(xrootd-ddev_1.cf) and redirector (xrootd-ddev_1rdr.cf).
I hope that helps.

Cheers,
  Wilko



On Wed, 23 Mar 2005, Derek Feichtinger wrote:

> Hi,
>
> I tried writing files via a redirector (using xrootd-20050321-0425). 
> Although
> I get now a much better error message from the logs and from xrdcp using 
> this
> version, the write via redirector still does not work (but I can write to
> every data server with xrootd if I address it directly). Is this currently
> not supported?
>
> Thanks,
> Derek
>
> --
> Dr. Derek Feichtinger                   Tel:   +41 22 767 10 07
> LCG/ARDA Group                            email: [log in to unmask]
> CERN 
> http://people.web.psi.ch/feichtinger
> CH-1211 Genève 23
>
>
> Error msgs:
> -----------------
> Error accessing path/file for root://redir:1094//tmp/xrootd/test10.txt
>
> odc_Locate: dfeich.13455:12@pcarda10 given error msg 'No servers have 
> write
> access to the file' by lxn5219 path=/tmp/xrootd/test10.txt
> 050323 11:20:05 6747 dfeich.13455:12@pcarda10 XrootdResponse: 0000 sending 
> err
> 3005: No servers have write access to the file
>
>
> Configs:
> -------------
> #
> # dataserver.cf
> #
> # xrootd
> xrootd.fslib /opt/xrootd/xrootd-20050321-0425/lib/arch/libXrdOfs.so
> xrootd.export /tmp/xrootd
> odc.manager  redir
> # olbd
> olb.port 3121
> olb.subscribe redir 3121
>
>
> #
> # redirector.cf
> #
> # xrootd
> xrootd.fslib /opt/xrootd/xrootd-20050321-0425/lib/arch/libXrdOfs.so
> xrootd.export /tmp/xrootd
> odc.manager redir 3121
> #odc.trace redirect
> odc.trace all debug
> ofs.trace all debug
> # olbd
> olb.port 3121
> #olb.ping 30 5 5
> olb.allow host redir.cern.ch
> olb.allow host slave1.cern.ch
> olb.allow host slave2.cern.ch
> olb.trace all debug
>
> 




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