User Questions on Computing at CERN cluster and IFIC cluster

Link to CERN Computing Cluster

The IFIC Tier3 Computing Cluster

Questions:

• Question 1: When i try to log in valtical25, I always encounter a 'permission denied' problem, what's wrong? (from Amandar)
  • Answer : It's a problem related with kerberos security, solved by recreating the keytab file (lcm --configure krb5clt afsclt srvtab ).

• Question 2: Sometimes gmake can't include the latest modified file (somewhre under /work) on ticalui02, but on ticalui01 Ihave never encounter such problem, why? (from Juan)
  • Answer: /work is a disk mounted on ticalui01 and accessed by ticalui02 via NFS. on ticalui01, when the file is modified and saved, the saving actions almost takes effect immediately. But when you save the file on ticalui02, it's via NFS which will take a bit longer time but usually should also be very fast. But in case NFS server is very busy or the client/server communication is not so good, then the time could be much longer, in this case, you need to wait a few seconds before run the gmake.

-- Main.avalero - 13 Sep 2010