Main differences between TSUBAME 2.5 and TSUBAME 3.0 (Portal / Login / Payment)

This article describes the main difference between the TSUBAME2.5 and TSUBAME3.0.
Please refer to "TSUBAME 3.0 User's Guide" and "TSUBAME portal User's Guide" from here for details.

The flat-rate option has been abolished

Two options were selectable for TSUBAME 2.5: "flat-rate usage (campus only)" and "measured-rate usage (purchase of TSUBAME points)".

For TSUBAME 3.0, flat rate was abolished. No matter wheather in-campus or not, the option has been unitized into measured rate.

Payment method has been unified into prepayment

There were two payment methods in the measured-rate option for TSUBAME 2.5: "prepayment" and "automatic charging (campus only)" .

For TSUBAME 3.0, automatic charging has been abolished. No matter wheather in-campus or not, payment method has been unitized into prepayment. Points purchased once by prepayment isn't refunded in principle. When purchasing points, please check the group, payment code, number of purchase items (price) in order not to make a mistake.

Password login to both TSUBAME3 and portal from inside campus is no longer in use

Until TSUBAME 2.5, it was possible to use the password authentication when logging in from the campus.

In TSUBAME 3.0, to improve security, you can't log in from the campus, except for some terminals, to perform password authentication. SSH public key registration is required. In addition, when logging in to the TSUBAME portal, there is a method using single sign-on from Tokyo Tech Portal or a temporary URL for login sent by e-mail. password isn't used in both cases.

Operations requiring passwords with TSUBAME 3.0 are as follows. If you do not use the following functions, you do not need to set a password.

  • Connection to TSUBAME 3 high-speed storage by CIFS
  • Changing login shell with chsh command
  • Login to educational computer system
  • Terminals in some training rooms / Login without using SSH key authentication from TSUBAME 2 (for data migration)
  • Use of some ISV application licenses

TSUBAME 2.5 has a password expiration period of about half a year, TSUBAME 3.0 does not have a password expiration date. Please pay attention to password management and change as necessary.

The price and value of TSUBAME points has changed

Since TSUBAME 2.5 and TSUBAME 3.0 have different performance per node, usage fee per calculation time will differ.
In TSUBAME 2.5, about 1 node per hour is achieved with 1 point (e.g. calculation of 2 nodes 30 minutes at 1 point), TSUBAME 3.0 calculate about 1 node per secound with 1 point (e.g. calculation of 2 nodes 30 minutes at 3600 points).

For more information, please refer to rules / usage details.

ID verification is required when adding members to the group and budget usage of other faculty members


In TSUBAME 3.0, approval of the relevant user was required when adding members to a group or creating a payment code for the budget for which other faculty staff is responsible for budget. When an authorized user performs the above-mentioned operation, an e-mail for approval request will be sent to the user (in some cases it will be sent after confirmation by GSIC). Please login to TSUBAME portal and access the URL written in the e-mail and approve according to the displayed instructions.