Difference: FAQ (7 vs. 8)

Revision 82009-09-26 - ZhangXiaomei

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Usenet Frequently Asked Questions

1. How to get the create time and modified time of files in SE?

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There is a command in srm commmand lists called "srmls" which is able to do that, or simply use "ls -altr" when SE directory /pnfs is mounted. Examples:
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There is a command in srm commmand lists called "srmls" which is able to do that, or simply use "ls -altr" when SE directory /pnfs is mounted. Examples:
  srmls -l srm://srm.ihep.ac.cn:8443/pnfs/ihep.ac.cn/data/cms/zhangxm/test.123

35848192 /pnfs/ihep.ac.cn/data/cms/zhangxm/test.123

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2. How to specify job scheduler from the Beijing site?

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Since the Beijing site has not installed glite wmsproxy in our RB(resource broker), so please do the following selection:
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Since the Beijing site has not installed glite wmsproxy in our RB(resource broker), so please do the following selection:
  1. select other RB such as CERN, CNAF, you can choose glitecoll as scheduler. rb = CERN; scheduler = glitecoll;
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  scheduler = edg;
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3. How to use the T2 SE in the T3 farm?

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You can access the dataset in the T2 SE directly in the T3 local farm using dcap protocol. Dcap协议是由SE系统Dcache (cmsse01)提供的local(局域网)数据读取协议. 它与CMSSW软件使用直接结合,操作方便。避免了将T2数据拷贝到T3才能进行分析。Note:考虑到T2是提供给Global使用的,为了避免造成SE的过载,因此建议大家的同时运行的作业量不要超过100(随着SE性能不断改善,会进一步调整)。在T3上使用两个条件:

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You can access the dataset in the T2 SE directly in the T3 local farm using dcap protocol. Dcap协议是由SE系统Dcache (cmsse01)提供的local(局域网)数据读取协议. 它与CMSSW软件使用直接结合,操作方便。避免了将T2数据拷贝到T3才能进行分析。Note:考虑到T2是提供给Global使用的,为了避免造成SE的过载,因此建议大家的同时运行的作业量不要超过100(随着SE性能不断改善,会进一步调整)。在T3上使用两个条件:
 (1)在运行作业的UI 和Worknode上必须装有Dcap的客户端; (2)利用TFC(Trivial File Catalog)小型文件目录,简化dcap的写法。
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使用方法和步骤:

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使用方法和步骤:
  (1)初始化CMSSW的环境; (2)在pset.cfg中,填入所需要处理的数据集的逻辑名(也就是/pnfs/ihep.ac.cn/data/cms/<逻辑名>), 例如:

 
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