2026.04.01Periodic maintenance
According to the following schedule, we are planning to perform scheduled maintenance on each system.
We apologize for any inconvenience this may cause our users.
Supercomputer and Application Server
Schedule: 9:00 – 13:00, May 11, Jul 13, Nov 9, 2026, Jan 12, 2027.
During the maintenance, there will be a possibility that connection to these servers will be failed and that a connected session will be broken.
Batch jobs that will be queued or running on Supercomputer will not be affected by the maintenance.
Please note that the interactive jobs will be terminated forcibly.
Cloud Storage (Nextcloud)
Schedule: 9:00 – 13:00, May 12, Jul 14, Nov 10, 2026, Jan 13, 2027.
During the maintenance, you will not have access to your data.
Research Cloud
Schedule: 9:00 – 13:00, May 13, Jul 15, Nov 11, 2026, Jan 14, 2027.
Service is not available during the maintenance.
2026.05.25Regarding Temporary Restrictions on Certain Functions Due to Supercomputer Vulnerability Mitigation
Due to the implementation of temporary mitigation measures addressing a vulnerability in the supercomputer, some services are currently restricted until further notice.
The following tools are currently unavailable on the supercomputer’s compute nodes, login nodes, and application servers:
gdb, strace, VTune, Advisor, Inspector
These restrictions are expected to be lifted once the official countermeasures for this issue are implemented.
However, the exact timing for restoration has not yet been determined.
We sincerely apologize for any inconvenience this may cause and appreciate your kind understanding and cooperation.
2026.05.08[Completed] Notice of Supercomputer Compute Node Maintenance (May 25, 2026)
Services were resumed at 11:31 a.m.
Maintenance will be performed on the supercomputer compute nodes during the following period:
Date & Time : Monday, May 25, 2026, from 9:00 to 12:0011:31
During the maintenance period, neither batch jobs nor interactive jobs will be available on both the Shared Course and the Exclusive Course.
Jobs that do not complete before the start of the maintenance will be placed on hold and will resume sequentially after the service is restored.
Please note that there will be no impact on the login nodes or application servers.
We sincerely apologize for any inconvenience this may cause and appreciate your kind understanding and cooperation.
2026.05.01[Completed] Notice of Emergency Supercomputer Maintenance (May 1, 2026)
Services were resumed at 11:15 a.m.
Thank you very much for your cooperation.
Due to the identification of a critical vulnerability in our supercomputer system, we will conduct emergency maintenance during the following period:
Date & Time: Friday, May 1, 2026, from 9:00 a.m. to 12:00 p.m. 11:15 a.m.
During the maintenance period, all sessions on the login nodes and application servers will be disconnected, and users will not be able to log in.
Please note that batch jobs already submitted to or running on the supercomputer will not be affected; however, interactive jobs (interactive sessions) will be forcibly terminated.
We sincerely apologize for any inconvenience this may cause and appreciate your kind understanding and cooperation.
2026.03.21[Restored] Regarding the Failure of the Interdisciplinary Large-Scale Computing System
At approximately 3:50 a.m. on March 21, 2026, an instantaneous voltage dip—presumed to have been caused by strong winds—occurred, resulting in electrical system irregularities that have affected portions of the computing system and the cooling infrastructure.
We are currently conducting a detailed assessment of the situation and implementing necessary countermeasures; however, at this time, we are unable to provide an estimate for full restoration.
We will provide further updates as soon as there is any significant progress.
(Added on March 21, 2026, 19:00)
Due to this incident, a number of compute nodes within the supercomputing system (both CPU and GPU nodes) were brought offline.
The cooling system has already been fully restored, and we are currently proceeding with the recovery of the affected nodes as well as verifying the extent of the impact.
Once restoration is complete and the scope of the impact has been determined, the Center will contact individual users whose running jobs were affected.
Please note that the impact of this incident is limited strictly to the supercomputing system; the Research cloud and Nextcloud services have not been affected.
Login access to the supercomputer and the submission of new jobs remain available; however, jobs will begin executing sequentially on nodes as they are restored.
We sincerely apologize for the inconvenience this incident has caused to all users.
We kindly ask for your patience and understanding as we work toward complete recovery.
Service was restored at 12:45 a.m. on March 24.
2026.02.17[Completed] Notice of Service Suspension Due to End-of-Year Maintenance in Fiscal Year 2025
Due to year-end processing and maintenance, our service will stop as follows.
Thank you for your understanding.
Supercomputer and Application server
Service stop: Thursday, March 26, 2026, 3:00 PM – Wednesday, April 1, 2026, 1:00 PM (resumed)
- During the above period, connection to Supercomputer and Application server will be unavailable (including Supercomputer File System).
- The download version of Mathematica cannot be used.
- If it is predicted that a submitted or queued job will not be completed by 3/26 3PM, the job will be cancelled.
- And the remaining tokens will not be carried-over next fiscal year.
- If you wish to continue using your current user number (supercomputer login account) next year, you are required to submit a renewal application. Data for accounts without a renewal application will be inaccessible after March 30, 2026. We strongly recommend backing up any necessary data before the service interruption time.
Research cloud
Service stop: Thursday, March 26, 2026, 3:00 PM – Wednesday, April 1, 2026, 1:00 PM (resumed)
- Please be aware that Research Cloud is provided on an annual basis and data transfer to the following year is not supported. We kindly request all users to back up any necessary data before the service interruption time.
Cloud storage (Nextcloud)
Service stop: Monday, March 30, 2026, 5:00 PM – Wednesday, April 1, 2026, 9:00 AM (resumed)
- If you wish to continue using your current user number (Nextcloud account) next year, you are required to submit a renewal application. Data for accounts without a renewal application will be inaccessible after March 30, 2026. We strongly recommend backing up any necessary data before the service interruption time.
User portal
Service stop: Thursday, March 26, 2026, 3:00 PM – Wednesday, April 1, 2026, 1:00 PM (resumed)
2026.02.12[Restored] Failure of the supercomputer job scheduler
On Wednesday afternoon through evening, February 11, 2026, a temporary issue occurred that prevented submitted jobs on the supercomputer from running.
We are currently investigating the impact on any jobs that were running at the time.
If your job was affected, we will contact you individually.
We apologize for any inconvenience this may have caused.
2025.12.23[Restored] Regarding the Failure of Supercomputer Computing Nodes (23/12/2025)
At 10:00 on 23 December 2025, an issue with the supercomputer’s cooling system caused a failure, resulting in downtime for some compute nodes.
Due to this impact, we have also temporarily suspended the execution of new jobs on all compute nodes (both exclusive and shared).
We are currently investigating the situation, but the estimated restoration time is currently unknown.
We will provide an update as soon as there is progress.
We sincerely apologise for any inconvenience caused to our users.
We kindly ask for your patience until the system is restored.
(Updated 2025/12/23 13:25)
Service has been restored, and the suspension of job execution was lifted at 13:15.
We will contact users whose jobs were forcibly terminated due to this outage separately.
We sincerely apologize for any inconvenience caused to users.
2025.11.17[Finished] Notice Regarding FieldView and Pointwise Maintenance
Due to license renewal work for FieldView and Pointwise, these applications will be unavailable during the following period:
Service stop: Monday, December 1, 2025, 0:00 AM to 5:00 PM
We apologize for any inconvenience this may cause and appreciate your understanding.
2025.08.12[Finished] Temporary suspension of service due to the planned power outage
Due to the planned power outage in Hokkaido University and related maintenance, our service will stop as follows. Thank you for your understanding.
Supercomputer and Application server
Service stop: Sep. 12th (Fri), 17:00 – Sep. 17th (Wed), 13:00
- During the above period, connection to Supercomputer and Application server will be unavailable (including Supercomputer File System).
- If it is predicted that a submitted job will not be completed by the service stop, the job will be queued (not start) and start after the service restarting.
- Application software that needs license activation will be unavailable during the above service stop period.
Research cloud
Service stop: Sep. 12th (Fri), 17:00 – Sep. 17th (Wed), 13:00
- Pods will be deleted when the Research Cloud system is shut down.
- Data within Pods will also be lost upon deletion. Therefore, please ensure that necessary data is stored in Persistent Volumes.
- After the service is restored, Pods using Deployments/StatefulSets will automatically restart. However, Pods not utilizing these will require recreation.
Nextcloud
Service stop: Sep. 11th (Thu), 17:00 – Sep. 16th (Tue), 9:00
User portal
Service stop: Sep. 11th (Thu), 17:00 – Sep. 17th (Wed), 13:00
- Since you will not be able to log in to the portal during this time, please complete any necessary operations, such as registering an SSH public key or downloading applications, before the service is stopped.
2025.07.01Periodic maintenance
According to the following schedule, we are planning to perform scheduled maintenance on each system.
We apologize for any inconvenience this may cause our users.
Supercomputer and Application Server
Schedule: 9:00 – 13:00, Jul. 22, Nov. 17, 2025, Jan. 19, 2026.
During the maintenance, there will be a possibility that connection to these servers will be failed and that a connected session will be broken.
Batch jobs that will be queued or running on Supercomputer will not be affected by the maintenance.
Please note that the interactive jobs will be terminated forcibly.
Cloud Storage (Nextcloud)
Schedule: 9:00 – 13:00, Jul. 23, Nov. 18, 2025, Jan. 20, 2026.
During the maintenance, you will not have access to your data. The work on Nov.18 has been canceled.
Research Cloud
Schedule: 9:00 – 13:00, Jul. 24, Nov. 19, 2025, Jan. 21, 2026.
Service is not available during the maintenance. The work on Jan.21 has been canceled.