[Important] About suspension of TSUBAME service for cleaning of cooling system (11/6-11/7)


 To clean the cooling system, we will stop TSUBAME 3.0 service as follows. At the same time, we also make various change which can not be done during usual operation.

1. Period

11/6/2018 9:00 - 11/7/2018 17:00
* The suspension period may be around.

2.Services to be stopped

 Batch queue (All computation nodes will be stopped and can not be used)
 TSUBAME portal (Can be used intermittently, or not)
 login (login0,1)
 Storage service (/home,/gs/hs0,/gs/hs1,/gs/hs2)


3.Services not to be stopped

 GSIC hosting (known as TSUBAME hosting)
 TSUBAME Computing Service Web (this site)
 License server (TSUBAME3.0 software referring to lice0, including in-campus distributed software reffering to lice0)
 Educational computer system (iMac terminal managed by GSIC)


4.Operation content and purpose

 Cleaning of rooftop cooling tower.
 Cleaning of chiller system cooling facility.
    Organization of test modules that shouldn't be open to users but have been available. 
    Delete data of group disks created in 2017 and not yet purchased.  
    Update certificates for GSI-SSH server.
 (10/19 added)(10/22 update)Changes in the number of simultaneous executions for equalization of opportunities of use of compute nodes during high season (Oct.-Mar.).

  変更前 変更後
Number of concurrently executable jobs per person 150 jobs 50 jobs
Total number of slots that can be simultaneously executed per person 2016 slots  1792 slots
Maximum parallelism per job 72 nodes 64nodes 72 nodes(*1)

*1…The maximum degree of parallelization remains at 72 nodes, but due to constraints on the number of slots, for example, 72 nodes can not be parallelized on f_node (in this case 64 parallels are the maximum).