Information on the Multi-wavelength Data Analysis System
Astronomy Data Center,
National Astronomical Observatory of Japan
Revised: September 5, 2024

1. Introduction
The Astronomy Data Center, National Astronomical Observatory of Japan (ADC /NAOJ) renewed the Multi-wavelength Data Analysis System (MDAS) and started its
operation in July 2024. This document introduces the system and briefly describes how
to use it. For more information about the system, please see the online user’s guide.
MDAS Web: https://www.adc.nao.ac.jp/MDAS/

2. LoginA) Access from inside NAOJ
When you log in to an analysis server of the MDAS from inside the NAOJ, you use“ssh” command on your own computer (PC) connected to the NAOJ network (KTnet).
e.g. To access mana05.ana.nao.ac.jp$ ssh [-X] YOURID@mana[00-07].ana.nao.ac.jp“YOURID” is your account name.
-X is an option to enable X11 forwarding.
e.g. <account name>@mana05.ana.nao.ac.jp"mana05.ana.nao.ac.jp" shown in the example is the host name of one of theeight analysis servers. See the following section for the system configuration.

B) Access from outside NAOJ
When you access the system from outside the NAOJ network (KTnet), you need touse a VPN (Virtual Private Network) service. After connecting to the VPN server with aVPN client software, log in to an analysis server with SSH. If you need the VPN service
for MDAS, apply for the service after confirming the following notes.
(1) Our VPN service is provided for users who belong to an institution other than
NAOJ and already have an MDAS user account.
(*) NAOJ staffs should use another VPN service provided by the network
support group in NAOJ. See the following URL.
https://nethelp.mtk.nao.ac.jp/contents/en/node/4(2) You can log in to the MDAS servers by using our VPN service (MDAS VPN),
although you cannot access other computers inside the NAOJ network with this1VPN.
(3) VPN use registration is required to use the VPN service. If you need the MDAS
VPN service, please apply for it from the MDAS Web page.

3. How to change password, e-mail address, and login shellYour password and registered e-mail address, which have been set when accountapplication, and type of login shell (default is bash) can be changed on an analysis
server using a dedicated command for the system, “modify_userinfo”.
Passwords must follow the following rules.
Password Policy:
The password shall be a combination of 2 types or more of English lowercase letters,
uppercase letters, numbers, and symbols, and it must be of the length of 12 charactersor more.
Users who have forgotten their current password must contact the administrator.
You can see your current information (e-mail address and login shell) with “userinfo”
command.
Command usage: modify_userinfo [-hpmsv] [argument]This command changes login shell, registered e-mail address, and password.
Options are as follows.
(-p, -m, and –s can be used simultaneously)-hprint help message and exit.
-pchange password.
-m <E-mail address>change registered e-mail address.
-s <login shell>change login shell. Available shells are as follows.
/bin/bash/bin/tcsh/bin/sh/bin/csh/bin/ksh/bin/zshe.g. To change e-mail address and login shell$ modify_userinfo -m mail@address -s /bin/tcsh

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4. System configuration (Hardware)
The system configuration of the hardware is as follows.

A)

Interactive Analysis Servers

The interactive analysis servers consist of eight nodes that use Rocky Linux 8 as theOS, which is compatible with Red Hat Enterprise Linux 8.

1.

Host name (FQDN) and Specifications(1) Computing nodes (Analysis Servers)
Host name: mana[00-07].ana.nao.ac.jp
Specification:OS: Rocky Linux 8
CPU: AMD EPYC 7543 (32cores / 2.8GHZ/MAX3.7GHz) ×2
Memory: 1024GB (DDR4/3200Mhz ECC Registered 64GB ×16)
† The current usage of each analysis server (CPU usage, number of logged-inusers, etc.) can be checked on the MDAS Web. You might want to use a server thatis not busy.
Note: We may warn users who occupy many resources (CPU core, memory, disketc.). Please be careful not to occupy them. Guidelines for maximum resources
available to a single user is found on the MDAS web.

2.

Disk configurations (user’s area)/home/lwk/ext_nfs[1,2]/ext_nfs3

55TB
User home area (NFS mount)
4329TB Large volume work area (Lustre file system)
393TB Extended disk area (NFS mount)
306TB Extended disk area (NFS mount)/home, /lwk, /ext_nfs[1-3] are mounted on all analysis servers. They are accessible
from all servers.
Every user's home directory is created in / home area.
The following quotas (usage limits per user) are set for each disk space.
The data retention period is currently under consideration. If a retention period isset, note that old files which have not been manipulated beyond the retention period
will be targets for periodic deletion. The status change of the file is determined by thetime stamp “ctime”. When the status is changed, the elapsed time is counted fromthe time of the last change.

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Quotas and retention periods for disk spaceB)

Mount namequota(Soflimit)

Retention periodHome area/home150GB

up to account deletion

Large volume
work area

/lwk

30TB

under consideration

Extended disk area

/ext_nfs[1,2]

10TB
(9TB)

under consideration

Extended disk area

/ext_nfs3

10TB
(9TB)

under consideration

Equipment in Open-Use Computer Rooms

There are some terminal computers, PCs, displays and printers in the open-use
computer rooms (South bldg. 2F, Subaru bldg. 1F, and ALMA bldg. 1F) in Mitaka
campus.
Terminal computers:
There are terminal computers at the desks in the open-use rooms, which can beused to access the MDAS and Internet. The terminals in the South building areavailable for anyone to use. The terminals in the Subaru building and the ALMA
building are dedicated terminals that require logging in with your MDAS account.
Remote login to these terminal computers and access to the inside of the NAOJ
network other than the MDAS from them are not allowed.
The displays connected to the terminal computers can also be used as externalmonitors by connecting them to a PC brought in by users.
Network printers:
Network printers compatible with A4 size paper are installed in all open-use
computer rooms. These printers can also be used from terminal computers and PCs
in the open-use rooms.
Large format printers:
Large format printers that support A0+ and B0+ size are available in theopen-use computer room in the South building. You can use them for poster printing,etc. Printing is possible from open-use PCs (Windows, Mac) in the room.

45. Software
You can use various software for astronomical data analysis and scientificcalculations on the system. List of the installed software can be seen on the user’s guide.

6. Changing user registration information
When your registration information such as affiliation, address, or phone number
changes, please inform the ADC of the changes. You can submit your changes via anapplication form on the MDAS Web.
As for the change of E-mail address among the registration information, we ask you
to change it yourself on an analysis server. To change your E-mail address registered inthe system (which is included in “allusers” mailing list), you need to use the“modify_userinfo -m” command after login to the system (see section 3).
Please keep your registered E-mail address up to date. It is very important because
we use the address to inform you of essential information about the system.

7. Annual account update
All user accounts expire at the year-end of every fiscal year. An update application isnecessary for continuous use. Information on the account update procedure will beannounced by E-mail to your registered address every year.
If you do not submit the account update application by the deadline, your accountwill be locked and deleted.

8. Inquiries about the system
Details of the system and questions and answers about the system are described in
the user’s guide and FAQ web page. Please visit the following pages.
User’s guide: https://www.adc.nao.ac.jp/MDAS/ug/mdas-ug_e/
FAQ:
https://www.adc.nao.ac.jp/cgi-bin/cfw/wiki.cgi/FAQ/FAQE
If you have any questions, please contact us.
E-mail:consult@ana.nao.ac.jp

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