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XROOTD-L  February 2012

XROOTD-L February 2012

Subject:

Re: data only goes to first drive

From:

Andrew Hanushevsky <[log in to unmask]>

Reply-To:

Support use of xrootd by HEP experiments <[log in to unmask]>

Date:

Fri, 17 Feb 2012 16:46:21 -0800

Content-Type:

TEXT/PLAIN

Parts/Attachments:

Parts/Attachments

TEXT/PLAIN (134 lines)

Hi Keith,

Please send me your config file.

Andy

On Fri, 17 Feb 2012, Keith Beattie wrote:

> ok, I spoke too soon, this problem seems to be back.
>
> I've added data server nodes, now 13 of them, each with 3 drives and only the 
> first drive is getting populated with any data - except for 1 of them.  After 
> loading the cluster with lots of files, the first drive on all of them are at 
> 100% usage with the rest of the drives at 3-5% usage.  The one outlier's 2nd 
> drive is at 20% usage.  All these drives are 6-700 GB total size.
>
> Digging deeper on each data server node, on all of them (except for that 
> outlier) oss.localroot (/export/data/xrd/ns/) is not getting populated with 
> symlinks into the 'oss.space public' locations (/export/data*/xrd/data/) but 
> the data files are directly there. Further, there *are* lots of files under 
> the oss.space public locations (e.g. 
> /export/data2/xrd/data/public/1B/271B3B4FDB000000176%) but they are all 
> empty!
>
> On the one outlier there are symlinks to the 2nd drive, but that only 
> accounts for ~200 of the ~1000 entries under oss.localroot there.
>
> The config files for each of the data server nodes are identical.
>
> I tried duplicating the oss.space public lines in the configs, as was 
> previously suggested but that didn't seem to change anything.
>
> I'll try some other test, like using xrootd 3.0.5, different configs, but 
> these test take a while to complete, so I'm hoping this rings some bells here 
> as to what I might be missing.
>
> Thanks,
> ksb
>
> On 01/30/12 12:47, Keith Beattie wrote:
>> to follow up here...
>> 
>> I've tried it again, with the same configs, and now it works. To the
>> best of my knowledge nothing is different, except the absence of this
>> problem - both drives on all the clients are receiving data.
>> 
>> I'd rather know what fixed it, but I'll take it and move on.
>> 
>> Thanks for your help,
>> ksb
>> 
>> On 12/20/11 5:08 PM, Keith Beattie wrote:
>>> Here you go, attached. Both from xrootd and cmsd.
>>> 
>>> Thanks,
>>> ksb
>>> 
>>> On 12/16/11 11:55 PM, Wilko Kroeger wrote:
>>>> 
>>>> Hello Keith
>>>> 
>>>> I am using the release 3.1.0 at slac with cache systems (using oss.space
>>>> public ...) and files are placed in all cache systems.
>>>> Could you maybe post the startup message from the xrdlog?
>>>> 
>>>> Cheers,
>>>> Wilko
>>>> 
>>>> 
>>>> 
>>>> On Fri, 16 Dec 2011, Keith Beattie wrote:
>>>> 
>>>>> Hi Andy,
>>>>> 
>>>>> I'm using 3.1.0, built from source. I tried doubling the oss.cache
>>>>> lines and the servers failed to start. When using oss.space rather
>>>>> than oss.cache, doubling those lines isn't fatal, but regardless I get
>>>>> the same behavior - data only to the first entry.
>>>>> 
>>>>> Thanks,
>>>>> ksb
>>>>> 
>>>>> On 12/16/11 6:06 PM, Andrew Hanushevsky wrote:
>>>>>> Hi Keith,
>>>>>> 
>>>>>> You may not be missing anything, depending on what version you are
>>>>>> using. There was a bug that exhibited exactly this behaviour. The
>>>>>> bypass
>>>>>> (other than upgrading to atleast 3.0.2) is to list the oss.cache
>>>>>> entries
>>>>>> twice for each path.
>>>>>> 
>>>>>> Andy
>>>>>> 
>>>>>> On Fri, 16 Dec 2011, Keith Beattie wrote:
>>>>>> 
>>>>>>> Hello all,
>>>>>>> 
>>>>>>> This seems like I'm missing something simple but can't seem to find
>>>>>>> it.
>>>>>>> 
>>>>>>> On my data servers nodes, only the first 'oss.cache' entry is getting
>>>>>>> data, the following disks don't seem to ever get written to. Below is
>>>>>>> an example of what the config looks like on the data nodes (not santa
>>>>>>> where the manager is running). What am I missing?
>>>>>>> 
>>>>>>> ----
>>>>>>> all.role server
>>>>>>> all.manager santa 3121
>>>>>>> 
>>>>>>> all.export /
>>>>>>> oss.localroot /data/ns
>>>>>>> oss.cache public /data/xrddata
>>>>>>> oss.cache public /data1/xrddata
>>>>>>> ----
>>>>>>> 
>>>>>>> i.e. /data/xrddata gets filled, /data1/xrddata does not.
>>>>>>> 
>>>>>>> Thanks,
>>>>>>> ksb
>
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