The percentage of unavailable node hour in this fiscal year, which excludes scheduled maintenance, is 1.14%.

Description

• If one processor of the Processor Node (PN) is in failure, the PN will be excluded from operation.
• If a job is aborted because of PN failure, the job will be restarted using another node automatically.
• The disk system employs RAID5 configuration. Most of the disk failures have no influence on user program execution.

Number of components

Processor Nodes and Internode Crossbar Switch

• Processor Node (PN) : 160 nodes
• Internode Crossbar Switch (IXS)

Hard disks

• User disks (about 1.5 PB)
• Work disks (about 500 TB)

Login server, etc.

• Login servers
• Remote servers
• Various other servers, network devices

* ES2 finished operations in February 2015 .