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Support use of xrootd by HEP experiments

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Subject:
From:
Andrew Hanushevsky <[log in to unmask]>
Date:
26 Jun 2007 19:34:41 -0700 (PDT)Tue, 26 Jun 2007 19:34:41 -0700 (PDT)
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Hi Al,

Technically, your config file should have worked since the "olb.path" 
directive would be used along with the local root should you not have 
specified the cache directive (which you did not). So, this indicates that 
there is a problem with that default action. What Wilko says is true but 
it's simply easier to designate the cache as the local root path which 
makes it possible to not create the cache0 directory. He is correct that 
if you do that you should use the inplace option to avoid using the cache.

Andy

On Tue, 26 Jun 2007, Wilko Kroeger wrote:

>
> Hello Andreas
>
> I think you have to specify a cache system.
>
> try to add:
> oss.cache /export/gka1900/babar10/kanga/cache0
> oss.path /store inplace
> oss.path /prod inplace
>
> In this case (inplace) the files are not put into the cache.
> (The cache dir must exists)
>
> I think in the new version the configuration of the path should be easier but 
> I have to check it as i am not quite sure if Andys improvements made it into 
> the latest production release.
>
> Cheers,
>   Wilko
>
>
> On Tue, 26 Jun 2007, Andreas Petzold wrote:
>
>> 	Hi Wilko and Andy,
>> 
>> 
>> On Friday 22 June 2007 17:11:44 Wilko Kroeger wrote:
>>> Hello Andreas
>>> 
>>> You should just need
>>> olb.path w /store
>>> in the config for the redirector.
>>> 
>>> You can checkout the configuration used at slac:
>>> # redirector-config
>>> http://www.slac.stanford.edu/~wilko/xrd/xrootd.cf_rdr
>>> 
>>> # dataserver config
>>> http://www.slac.stanford.edu/~wilko/xrd/xrootd.cf_srv
>>> 
>>> Which xrootd version are you using?
>>> The latest productions version 20070321-1251p1 makes the configuration a
>>> little bit easier.
>> 
>> we still haven't gotten it to work :-(. We've switched to the latest
>> production version on one of our dataservers, but now the olb on the
>> dataserver complains that there are no writable file systems.
>> 
>> 070626 15:40:54 001 [log in to unmask] phase 1 server 
>> initialization
>> suceeded.
>> 070626 15:40:54 001 [log in to unmask] phase 2 server 
>> initialization
>> started.
>> 070626 15:40:54 001 olb_Meter: Warning! No writable filesystems found; 
>> write
>> access and staging prohibited.
>> 070626 15:40:54 001 [log in to unmask] phase 2 server 
>> initialization
>> completed.
>> 070626 15:40:54 001 olbd [log in to unmask]:54571 initialization
>> completed.
>> 
>> The config we are using on this sever looks like this:
>> 
>> all.manager l01-001-110.gridka.de 3121
>> all.role manager if l01-001-110.gridka.de
>> all.role server if f01*.gridka.de
>> 
>> olb.path r /store
>> olb.path w /prod
>> olb.port 3121
>> olb.sched cpu 100
>> 
>> oss.alloc * * 80
>> oss.fdlimit * max
>> oss.localroot /export/gka1900/babar10/kanga/EventStore
>> 
>> xrd.protocol xrootd *
>> 
>> xrootd.async off
>> xrootd.chksum crc32 /home/xrootd/bin/getCRC32.sh
>> xrootd.export /prod
>> xrootd.export /store
>> xrootd.fslib /home/xrootd/software/gpfs/current/lib/libXrdOfs.so
>> xrootd.monitor all dest files info user babar2:9930
>> 
>> The /prod and /store areas are actually on the same file system:
>> 
>> ls -l /export/gka1900/babar10/kanga/EventStore
>> total 64
>> drwxrwxr-x  5 babaradm babar 32768 Jun 26 14:32 prod
>> drwxrwxr-x  7 babaradm babar 32768 Apr 16 09:56 store
>> 
>> The user that is running xrootd belongs to the group 'babar' so we don't 
>> think
>> it is a permissions problem.
>>
>> 	Cheers,
>>
>> 		Florian,
>> 		Jan Erik,
>> 		Andreas
>> 
>>> 
>>> Cheers,
>>>     Wilko
>>> 
>>> On Fri, 22 Jun 2007, Andreas Petzold wrote:
>>>> 	Hi,
>>>> 
>>>> I have a redirector and a few dataservers. The servers export a file
>>>> system /prod with write permissions:
>>>> 
>>>> olb.path r /store
>>>> olb.path w /prod
>>>> olb.port 3121
>>>> olb.sched cpu 100
>>>> olb.subscribe l01-001-110.gridka.de
>>>> olb.wait
>>>> 
>>>> ofs.redirect target
>>>> 
>>>> oss.alloc * * 80
>>>> oss.fdlimit * max
>>>> oss.localroot /home/xrootd/disk
>>>> 
>>>> xrd.protocol xrootd *
>>>> 
>>>> xrootd.async off
>>>> xrootd.chksum crc32 /home/xrootd/bin/getCRC32.sh
>>>> xrootd.export /prod
>>>> xrootd.export /store
>>>> 
>>>> No I have the following problem. I want to copy a file to the server
>>>> pool, but the redirector claims that no server is available for writing
>>>> the file:
>>>> 
>>>> xrdcp -d 2 ap_skims.lst root://babar.gridka.de:1094//prod/
>>>> [snip]
>>>> 070622 15:42:19 10305 Xrd: SendGenCommand: Server declared: No servers
>>>> are available to write the file.(error code: 3005)
>>>> 
>>>> Interestingly enough, I seem to be able to delete files from the servers
>>>> via xrootd.
>>>> 
>>>> How should I configure the dataservers so that I'm able to write to the
>>>> through the redirector?
>>>>
>>>> 	Cheers,
>>>>
>>>> 		Andreas
>> 
>> 
>> 
>



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